Brand names: Jylamvo, Otrexup, Rasuvo, Trexall Xatmep
Drug class: Antineoplastic Agents

Medically reviewed by Drugs.com on Mar 10, 2025. Written by ASHP.

Introduction

Antineoplastic agent and immunosuppressant; folic acid antagonist.^{1 2 3 4 5 6 265 269}

Uses for Methotrexate

Trophoblastic Diseases

Methotrexate injection and powder for injection used as part of a combination chemotherapy regimen for treatment of trophoblastic diseases (choriocarcinoma, invasive mole [formerly known as chorioadenoma destruens], hydatidiform mole) in adults.^{1 2 7}

First-line therapy in patients with low-risk gestational trophoblastic neoplasms (i.e., invasive mole or choriocarcinoma histology with 1) International Federation of Gynecology and Obstetrics [FIGO] stage I disease [confined to the uterus] or 2) FIGO stage II or III disease [extending to genital structures outside the uterus or to the lungs, respectively] and WHO risk score <7 [indicating low likelihood of resistance to single-agent chemotherapy]).^{7 10}

In patients with high-risk trophoblastic neoplasms, methotrexate in combination with etoposide, dactinomycin, vincristine, and cyclophosphamide (EMA-CO) is a standard treatment option.¹⁰

Leukemias

Used as a part of a combination chemotherapy maintenance regimen to treat acute lymphoblastic leukemia.^{1 2 5 6 265 269} Injection, powder for injection, oral solution (Jylamvo only), and oral tablets approved for this indication in adults and pediatric patients.^{1 2 5 265 269} Xatmep (methotrexate oral solution) approved for this indication in pediatric patients only;⁶ designated an orphan drug by the FDA for this indication in pediatric patients 0–16 years of age.¹²

Injection and powder for injection also used for prophylaxis and treatment of meningeal leukemia in adults and pediatric patients.^{1 2}

Osteosarcoma

High-dose therapy with injection or powder for injection, followed by leucovorin or levoleucovorin rescue, is used in combination chemotherapy regimens as adjunct to surgical resection or amputation of primary tumor in patients with nonmetastatic osteosarcoma^{1 2 14 15} (designated an orphan drug by FDA for this use).¹²

Breast Cancer

Injection and powder for injection used for treatment (alone or, more commonly, as part of a combination chemotherapy regimen) of breast cancer.^{1 2}

Used in combination with cyclophosphamide and fluorouracil (CMF) as an alternative option to doxorubicin-cyclophosphamide when an anthracycline-taxane combination is contraindicated.^{16 17}

Lymphoma

Used for treatment of various types of lymphoma.^{1 2 5 45 46} Injection, powder for injection, tablets, and oral solution (Jylamvo only) used for the treatment of non-Hodgkin lymphomas in adults; non-injectable formulations of methotrexate specify that it should be used as part of a metronomic combination regimen for this indication.^{1 2 5 265 269}

Methotrexate injection and powder for injection also approved for the treatment of non-Hodgkin lymphomas in pediatric patients.^{1 2} Methotrexate powder for injection, tablets, and oral solution (Jylamvo only) also used as a single agent or as part of a combination chemotherapy regimen to treat mycosis fungoides (cutaneous T-cell lymphoma) in adults.^{2 5 265 269}

Psoriasis

Treatment of severe psoriasis in carefully selected adult patients (all formulations except Xatmep oral solution); powder for injection and injection for sub-Q use (Rasuvo and Otrexup) used specifically for symptomatic control of severe, recalcitrant, disabling psoriasis that is not adequately responsive to other forms of therapy.^{2 3 4} Guidelines generally support use of methotrexate, administered orally or sub-Q, for treatment of moderate to severe psoriasis in adults.²⁰⁰⁹

Recommendations for use and selection of psoriasis therapies vary based on patient age, disease characteristics (e.g., severity, location, presence of psoriatic arthritis), and comorbidities (e.g., inflammatory bowel disease).^{2007 2008 2009 2010 2011 2012}

Rheumatoid Arth

All formulations except Xatmep oral solution used for management of rheumatoid arthritis in adults;^{1 2 3 4 5 265 269} powder for injection and injection for sub-Q use (Rasuvo and Otrexup) used specifically in adults with severe, active disease who are intolerant to or whose symptoms progress despite adequate first-line treatment.^{2 3 4}

Disease-modifying treatments for rheumatoid arthritis include conventional DMARDs (e.g., hydroxychloroquine, leflunomide, methotrexate, sulfasalazine), biologic DMARDs (e.g., TNF blocking agents, abatacept, tocilizumab, sarilumab, rituximab), and/or targeted synthetic DMARDs (e.g., Janus kinase inhibitors).²⁰⁰³

Guidelines generally support use of methotrexate monotherapy first-line in DMARD-naïve patients with moderate to high disease activity.²⁰⁰³

Specific agents for rheumatoid arthritis are selected according to current disease activity, prior therapies used, and presence of comorbidities.²⁰⁰³ Individualized “treat-to-target” approach is typically employed, with the goal of achieving remission or minimal/low disease activity.²⁰¹⁴

Polyarticular Juvenile Idiopathic Arthritis

Used for the management of polyarticular juvenile idiopathic arthritis in pediatric patients;^{1 2 3 4 5 6 265 269} powder for injection, injection for sub-Q use (Rasuvo and Otrexup), and oral solution (Xatmep only) specifically used in pediatric patients with severe, active disease who are intolerant to or whose symptoms progress despite adequate first-line treatment.^{2 3 4 6} Xatmep designated an orphan drug by FDA for this use in pediatric patients.¹²

Drugs used to treat juvenile idiopathic arthritis include NSAIAs, systemic and intra-articular corticosteroids, conventional disease-modifying antirheumatic drugs (DMARDs; e.g., methotrexate, sulfasalazine, hydroxychloroquine, leflunomide), and biologic DMARDs (e.g., TNF blocking agents, abatacept, tocilizumab, rituximab).²⁰¹³

Guidelines generally support use of methotrexate monotherapy for treatment of pediatric juvenile idiopathic arthritis and active polyarthritis.²⁰¹³

Specific agents for juvenile idiopathic arthritis treatment are selected according to presence of certain risk factors (e.g., positive anti-cyclic citrullinated peptide antibodies, positive rheumatoid factor, joint damage), level of disease activity, involvement of specific joints, presence of certain comorbidities (e.g., uveitis), and prior therapies.^{2013 2022} Individualized “treat-to-target” approach is typically employed, with the goal of achieving remission or minimal/low disease activity.²⁰¹⁴

Head and Neck Cancer

Injection and powder for injection used for palliative treatment (alone and as part of combination therapy) of recurrent or metastatic head and neck carcinoma.^{1 2 210 211}

Combination chemotherapy regimens associated with increased response rates²¹¹ but no survival advantage compared to methotrexate monotherapy.^{28 29 211}

Crohn's Disease

Induction and maintenance of remission in patients with moderate to severe Crohn's disease^{† [off-label]} .^{250 251 2000 2001}

Other Uses

Used in combination regimens with vinblastine and cisplatin, with or without doxorubicin for invasive and advanced bladder cancer^{† [off-label]} .^{30 31}

Used IM for treatment of tubal ectopic pregnancy^{† [off-label]} in women with the following characteristics: high clinical suspicion or confirmation of ectopic pregnancy, hemodynamically stable, unruptured mass, no absolute contraindications to methotrexate.⁴²

Used for immunosuppressive and/or anti-inflammatory effects in the treatment of atopic dermatitis^{† [off-label]35} , psoriatic arthritis^{† [off-label]2005} , systemic lupus erythematosus^†36 , antineutrophil cytoplasmic antibody-associated vasculitides^†37 , dermatomyositis^†38 , polymyositis^†38 , and a variety of dermatologic and chronic refractory ocular diseases^† .^{39 40}

Has also been used for prophylaxis of acute graft-versus-host disease^† following stem cell transplantation for hematologic malignancies.⁴¹

Although labeled for use in squamous cell type of non-small cell lung cancer,² other agents are preferred.³⁴

Methotrexate Dosage and Administration

General

Pretreatment Screening

• Verify pregnancy status in patients of reproductive potential.^{1 2 3 4 5 6 265 269}

• Assess complete blood count (CBC) with differential, platelet counts, liver function tests, and renal function tests.^{1 2 3 4 5 6 265 269}

• Obtain a chest X-ray.^{2 3 4}

• Monitor electrolytes at baseline in patients who will receive high-dose therapy.¹

• Administer all appropriate vaccines according to immunization guidelines.^{1 5 265 269}

• Evacuate any significant third space accumulations prior to initiating methotrexate.^{1 2 3 4 5 6 265 269}

Patient Monitoring

• Monitor hematologic tests periodically (some manufacturers recommend at least once per month) during treatment.^{1 2 3 4 5 6 265 269}

• Monitor renal and hepatic function every 1–2 months during treatment.^{1 2 3 4 5 6 265 269}

• More frequent monitoring of these parameters may be necessary during treatment initiation, when changing doses, or during periods of increased risk of elevated methotrexate blood levels (e.g., dehydration).^{2 3 4 6}

• Monitor for signs of infection and toxicity (including bone marrow, gastrointestinal, renal, hepatic, neurologic, pulmonary, and dermatologic toxicity) during treatment.^{1 2 3 4 5 6 265 269}

• If a high-dose regimen is utilized, monitor serum creatinine, electrolytes, and methotrexate concentrations at least daily during therapy.^{1 2}

Premedication and Prophylaxis

• To decrease the risk of severe adverse reactions, administer rescue therapy with leucovorin or levoleucovorin in patients receiving high-dose (i.e., ≥500 mg/m²) methotrexate therapy; consider rescue therapy for intermediate-dose (100–500 mg/m²) methotrexate therapy.^{1 2}

• Patients administered high-dose regimens should receive IV fluid hydration and urine alkalinization (to a urinary pH ≥7) throughout treatment.^{1 2} Consider such strategies for patients administered intermediate-dose regimens as well.¹

• For non-oncologic indications (i.e., polyarticular juvenile idiopathic arthritis, rheumatoid arthritis, and psoriasis), administer folic acid or folinic acid along with methotrexate to reduce the risk of adverse reactions from methotrexate.^{1 5 265 269}

Dispensing and Administration Precautions

• Based on the Institute for Safe Medication Practices (ISMP), methotrexate is a high-alert medication that has a heightened risk of causing significant patient harm when used in error.⁴⁵

• Procedures for proper handling and disposal of antineoplastic drugs should be followed when preparing or administering methotrexate.^{1 2 3 4 5 6 265 269}

• According to the ISMP, brand and generic methotrexate products can be confused with other drug products on the market and require special safeguards to reduce the risk of errors (e.g., using both brand and generic names on prescriptions and labels, including the purpose of the medication on prescriptions, configuring computer systems to require a minimum of the first 5 letters of a drug name during product searches, and changing the appearance of look-alike product names).⁴⁶

• Use only preservative-free products when treating neonates or low-birth weight infants.^{1 2} Preservative-free formulations also must be used for intrathecal or high-dose regimens.^{1 2}

• Deaths have occurred due to medication errors, most often when methotrexate was administered daily when a weekly regimen was prescribed.^{1 5} When a once weekly dosing regimen is prescribed, instruct patients and caregivers to take the dosage as directed.¹ Instruct patients and caregivers on how to measure, dose, and administer the recommended dosage as directed.⁵

Other General Considerations

• Administer glucarpidase in patients with toxic plasma methotrexate concentrations (>1 µmol/L) and delayed methotrexate clearance due to impaired renal function.^{1 2 5 6 265 269}

• When switching the dosing regimen between oral administration and IV, IM, or subcutaneous (sub-Q), consider potential differences in bioavailability;^{1 3 4 5 6 265 269} an alternative dosing regimen may be necessary.^{5 6 265 269}

Administration

Administer orally as tablets or oral solution or by IM, IV, sub-Q, or intrathecal injection; may also administer powder for injection intra-arterially.^{1 2 3 4 5 6 265 269} Some injectable preparations (Rasuvo and Otrexup) only administered sub-Q.^{3 4} Rasuvo only available in doses between 7.5–30 mg in 2.5 mg increments and Otrexup only available in doses between 10–25 mg in 2.5 mg increments; use a different formulation for dosing via oral, IM, IV, intraarterial, or intrathecal routes, weekly doses above or below available strengths for these products, high-dose regimens, or dosage adjustments in increments <2.5 mg.^{3 4}

Powder for injection requires reconstitution according to manufacturers’ directions.² Injection is available as a single-dose vial that is ready for use.¹ Rasuvo and Otrexup (injection for sub-Q use) are commercially available in single-use, prefilled auto-injectors.^{3 4}

Oral Tablets and Solution

Administer orally as tablets or oral solution.^{5 6 265 269}

Instruct patients or caregivers on proper dosing of oral solution, including the importance of an accurate measuring device; a household teaspoon is not an accurate measuring device.^{5 6} Jylamvo oral solution comes copackaged with a syringe and bottle adapter, which should be used to measure the dose.⁵

Do not administer tablets to patients unable to swallow tablets.^{265 269}

Powder for Injection

Administer by IM, IV, sub-Q, or intrathecal injection; may also administer intra-arterially.² Formulations or diluents containing preservatives must not be used for intrathecal administration or high-dose therapy; also use only preservative-free products when treating neonates or low-birth weight infants.²

Reconstitution

Reconstitute lyophilized powder for injection immediately before use with a sterile, preservative-free solution (e.g., 5% dextrose injection, 0.9% sodium chloride injection).²

Reconstitute 1 g vial with 19.4 mL of appropriate solution to yield a concentration of 50 mg/mL.²

Dilution

When high doses are administered by IV infusion, dilute total dose of reconstituted solution in 5% dextrose injection.²

If product is to be administered intrathecally, dilute to a concentration of 1 mg/mL with appropriate sterile, preservative-free medium such as 0.9% sodium chloride injection.²

Injection

Administer by IM, IV, sub-Q, or intrathecal injection.¹

Dilution

May be diluted immediately prior to use with preservative-free 0.9% sodium chloride injection.¹

If product is to be administered intrathecally, dilute to a concentration of 1 mg/mL with appropriate sterile, preservative-free medium such as 0.9% sodium chloride injection.²

Formulations or diluents containing preservatives must not be used for intrathecal administration or high-dose therapy; also use only preservative-free products when treating neonates or low-birth weight infants.²

Injection for Sub-Q Use

Rasuvo and Otrexup available as single-dose autoinjectors for sub-Q use only; administer in abdomen or thigh.^{3 4}

Dosage

Available as methotrexate sodium; dosage is expressed in terms of methotrexate.^{1 2 6 265 269}

Pediatric Patients

Lymphoma

IV

Dosage of injection or powder for injection varies for this indication.^{1 2}

For combination chemotherapy regimens, dosage of 1000 or 3000 mg/m² given IV over 24 hours.¹

When used for CNS-directed therapy, given as an IV infusion over 4 hours at a dosage of 8000 mg/m² (as a single agent) or at doses ranging from 3000–8000 mg/m² (in combination with immunochemotherapy).¹

Intrathecal

Dosage based on age.^{1 2} (see Leukemias under Pediatric Patients)

Osteosarcoma

IV

Initially, 12 g/m² infused over 4 hours^{1 2} on weeks 4, 5, 6, 7, 11, 12, 15, 16, 29, 30, 44, and 45 after surgery on a schedule in combination with other chemotherapy agents (e.g., doxorubicin; cisplatin; combination of bleomycin, cyclophosphamide, and dactinomycin).² If initial dosage is not sufficient to produce peak serum methotrexate concentrations of 454 mcg/mL (1000 µM [10-3 mol/L]) at the end of IV infusion, may increase dose to 15 g/m² in subsequent treatments.²

Polyarticular Juvenile Idiopathic Arthritis

Oral

Initially, 10 mg/m² once weekly.^{5 6 265 269} May adjust dosage gradually to achieve optimal response.^{5 6 265 269} Children receiving 20–30 mg/m²weekly may have better absorption and fewer adverse GI effects if administered either IM or sub-Q.^{6 265 269}

IM or Sub-Q

Initially, 10 mg/m² once weekly.^{1 2 3 4} May adjust dosage gradually to achieve optimal response.^{1 2 3 4} Children receiving 20–30 mg/m² weekly may have better absorption and fewer adverse GI effects if administered either IM or sub-Q.^{2 3 4}

ALL (Maintenance Therapy)

Oral

When used as part of a combination chemotherapy maintenance regimen, dosage varies based on dosage form.^{5 6 265 269} Administer oral solution and tablets at dosage of 20 mg/m² once weekly.^{5 6 265 269}

After treatment initiation, periodically monitor ANC and platelet count and adjust dosage as appropriate.^{5 6 265 269}

IM or IV

In general, dosages are highly variable and can range from 10–5000 mg/m² IV.¹ Individualize dose and schedule based on disease state, patient risk category, concurrent drugs used, phase of treatment, and response to treatment.¹

When used as part of a combination chemotherapy maintenance regimen, dosage varies based on dosage form.^{1 2}

Powder for injection has been administered twice weekly at a dose of 30 mg/m² IM or once every 14 days at a dose of 2.5 mg/kg IV.²

Meningeal Leukemia

Intrathecal

Injection and powder for injection approved for intrathecal administration for prophylaxis and treatment of meningeal leukemia.^{1 2}

For prophylaxis, administer no more than once weekly; for treatment, administer up to twice weekly.¹

Recommended intrathecal dosage based on age:^{1 2}

•<1 year: 6 mg

•1 to <2 years: 8 mg

•2 to <3 years: 10 mg

•3 to <9 years: 12 mg

•≥9 years: 12–15 mg

Adults

Breast Cancer

Various combination chemotherapy regimens have been used in the treatment of breast cancer; consult published protocols for dosages and method and sequence of administration.¹⁶

IV

Prescribing information for methotrexate injection includes dosage of 40 mg/m² as a component of a cyclophosphamide- and fluorouracil-based multi-drug regimen.¹

ALL (Maintenance Therapy)

Oral

When used as part of a combination chemotherapy maintenance regimen, dosage varies based on dosage form.^{5 6 265 269}

Administer oral solution and tablets at dosage of 20 mg/m² once weekly.^{5 6 265 269}

After treatment initiation, periodically monitor ANC and platelet count and adjust dosage as appropriate.^{5 6 265 269}

IM or IV

In general, dosages are highly variable and can range from 10–5000 mg/m² IV.¹ Individualize dose and schedule based on disease state, patient risk category, concurrent drugs used, phase of treatment, and response to treatment.¹

When used as part of a combination chemotherapy maintenance regimen, dosage varies based on dosage form.^{1 2}

Powder for injection has been administered twice weekly at a dose of 30 mg/m² IM or once every 14 days at a dose of 2.5 mg/kg IV.²

Meningeal Leukemia

Intrathecal

Injection and powder for injection approved for intrathecal administration for prophylaxis and treatment of meningeal leukemia.^{1 2}

Recommended dosage in adults is 12–15 mg.^{1 2}

For prophylaxis, administer no more than once weekly; for treatment, administer up to twice weekly.¹

Non-Hodgkins Lymphoma

IV

Dosage of injection or powder for injection varies for this indication.^{1 2}

For combination chemotherapy regimens, dosage of 1000 or 3000 mg/m² given IV over 24 hours.¹

When used for CNS-directed therapy, given as an IV infusion over 4 hours at a dosage of 8000 mg/m² (as a single agent) or at dosages ranging between 3000–8000 mg/m² (in combination with immunochemotherapy).¹

Oral

When used as part of a metronomic combination regimen to treat relapsed/refractory non-Hodgkin lymphomas, dosage is 2.5 mg orally given 2-4 times per week (maximum: 10 mg/week).^{5 265 269}

Intrathecal

12-15 mg.¹

Cutaneous T-cell Lymphoma; Mycosis Fungoides

Oral

Single agent: 25-75 mg once weekly.^{5 265 269}

As part of a combination chemotherapy regimen: 10 mg/m² twice weekly.^{5 265 269}

IV

5-75 mg.¹

Combination chemotherapy regimens that include higher- dose methotrexate with leucovorin rescue have been used in advanced stages.²

Osteosarcoma

IV

Initially, 12 g/m² infused over 4 hours^{1 2} on weeks 4, 5, 6, 7, 11, 12, 15, 16, 29, 30, 44, and 45 after surgery on a schedule in combination with other chemotherapy agents (e.g., doxorubicin; cisplatin; combination of bleomycin, cyclophosphamide, and dactinomycin).² If initial dosage is not sufficient to produce peak serum methotrexate concentrations of 454 mcg/mL (1000 µM [10-3 mol/L]) at the end of IV infusion, may increase dose to 15 g/m² in subsequent treatments.²

Psoriasis

Oral, IM, Sub-Q, or IV

Initially, 10–25 mg as a single dose once weekly until adequate response achieved.^{1 2 3 4 5 265 269} May gradually adjust dosage to achieve optimal response; do not exceed 30 mg weekly ordinarily.^{2 3 4 5 265 269} Once optimal response obtained, reduce dosage schedule to lowest possible dosage and longest possible rest period.^{2 3 4 5 265 269} Use of methotrexate to treat psoriasis may allow patients to return to using conventional topical treatments, which should be encouraged.^{2 3 4}

Rheumatoid Arthritis

Oral, IM, or Sub-Q

Initially, 7.5 mg once weekly, given orally, IM, or sub-Q.^{1 2 3 4 5 265 269} May gradually adjust dosage to achieve an optimal response.^{1 2 3 4 5 265 269}

At dosages >20 mg weekly, possible increased incidence and severity of serious toxic reactions, especially myelosuppression.^{1 2 3 4 5 265 269}

Trophoblastic Diseases

Oral or IM (Powder for Injection)

Usually, 15–30 mg daily for 5 days.² Repeat course may be given after a period of ≥1 week, provided all signs of residual toxicity have disappeared; 3–5 courses are usually employed.² Clinical assessment before each course is essential.²

Therapy is usually evaluated by 24-hour quantitative analysis of urinary chorionic gonadotropin (hCG), which usually normalizes after third or fourth course; complete resolution of measurable lesions usually occurs 4–6 weeks later.²

1 or 2 courses of therapy are usually given after normalization of urinary hCG concentrations is achieved.²

IM or IV (Injection)

Dosage of methotrexate injection varies by level of disease risk.¹

Low-risk disease: 30–200 mg/m² or 0.5–1 mg/kg IV or IM.¹

High-risk disease: 300 mg/m² given as a component of a multi-drug regimen via IV infusion over 12 hours.¹

Crohn's Disease

IM or Sub-Q

Induction of Remission: 25 mg once weekly has been used.^{2000 2001}

Maintenance Therapy: 15 mg once weekly has been used.^{2000 2001}

Special Populations

Hepatic Impairment

Adverse reactions from methotrexate may be more likely in patients with hepatic impairment.^{1 5 6 265 269} Use of powder for injection or injection for sub-Q use (Rasuvo and Otrexup) contraindicated for treatment of psoriasis or rheumatoid arthritis in patients with alcoholism, alcoholic liver disease, or other chronic liver disease.^{2 3 4} Consider reducing dosage or discontinuing in patients with hepatic impairment as appropriate.^{1 3 5 6 265 269}

Renal Impairment

Methotrexate elimination reduced with renal impairment (Cl_cr <90 mL/minute using the Cockcroft-Gault calculation); associated with increased risk of adverse reactions.^{1 3 4 5 6 265 269} Follow recommendations to promote elimination of methotrexate and decrease risk of acute kidney injury and other toxicities in patients receiving intermediate- or high-dose regimens of methotrexate injection.¹ Consider reducing dosage or discontinuing in patients with renal impairment as appropriate.^{1 3 4 5 6 265 269}

Geriatric Patients

No specific dosage recommendations.^{1 2 3 4 5 265 269} Select dosage with caution since hepatic and renal function and folate stores may be decreased; closely monitor for early signs of toxicity.^{2 3 4}

Cautions for Methotrexate

Contraindications

• History of hypersensitivity to methotrexate.^{1 2 3 4 5 6 265 269}

• Pregnancy (in patients with non-neoplastic diseases).^{1 2 3 4 5 6 265 269}

• Lactation (powder for injection only).²

• Alcoholism, alcoholic liver disease, or other chronic liver disease in patients with psoriasis or rheumatoid arthritis.^{2 3 4}

• Overt laboratory evidence of immunodeficiency syndromes in patients with psoriasis or rheumatoid arthritis.^{2 3 4}

• Preexisting blood dyscrasias (i.e., bone marrow hypoplasia, leukopenia, thrombocytopenia, or significant anemia) in patients with psoriasis or rheumatoid arthritis.^{2 3 4}

Warnings/Precautions

Warnings

Fetal/Neonatal Morbidity and Mortality

Fetal death and/or congenital anomalies reported (See Boxed Warning).^{1 2 3 4 5 6 265 269} Verify pregnancy status before initiating treatment.^{1 2 3 4 5 6 265 269} Avoid pregnancy if either partner is receiving methotrexate; avoid pregnancy during therapy and for ≥3 months after therapy in male patients and for at least 6 months after therapy in female patients.^{1 2 3 4 5 6 265 269} If used during pregnancy or patient becomes pregnant, apprise of potential fetal hazard.^{1 2 3 4 5 6 265 269} Certain forms of methotrexate contain benzyl alcohol; injection and powder for injection can cross the placenta.^{1 2} If methotrexate injection is administered to treat a neoplastic disease in a pregnant patient, use a preservative-free formulation when possible.²

Hypersensitivity and Dermatologic Reactions

Hypersensitivity and/or severe dermatologic reactions have occurred (See Boxed Warning).^{1 2 3 4 5 6 265 269} Hypersensitivity, including anaphylaxis, reported.^{1 5 6 265 269} If signs or symptoms of anaphylaxis or serious hypersensitivity occur, immediately discontinue therapy and institute appropriate management.^{1 5 6 265 269} Severe, occasionally fatal dermatologic reactions (e.g., Stevens-Johnson syndrome, exfoliative dermatitis, skin necrosis, erythema multiforme) reported following single or multiple doses of methotrexate administered via the oral, IM, IV, or intrathecal route in patients with neoplastic and non-neoplastic diseases.^{1 2 3 4 5 6 265 269} Lesions of psoriasis may be aggravated by concomitant exposure to ultraviolet radiation; possible “recall” radiation dermatitis and sunburn with methotrexate use.^{1 2 3 4 5 6 265 269} Monitor for dermatologic toxicity during therapy^{1 3 4 5 265 269} and counsel patients to use sun protection measures and avoid excessive sun exposure.^{1 5 265 269} Consider holding or permanently discontinuing treatment if dermatologic reactions occur.^{1 3 4 5 6 265 269}

Risk of Serious Adverse Reactions due to Benzyl Alcohol Preservative

Serious adverse reactions, including severe CNS toxicity or metabolic acidosis, reported when formulations of methotrexate injection or powder for injection containing benzyl alcohol administered to neonates or low-birth weight infants, or given intrathecally or in high-dose regimens (See Boxed Warning).^{1 2} Only administer preservative-free formulations in neonates and low-birth weight infants.^{1 2} If administering to infants who do not fall into these categories, consider combined daily metabolic load of benzyl alcohol from all sources (methotrexate injection contains 9.4 mg benzyl alcohol per mL).¹ Only use preservative-free formulations for intrathecal administration and do not use preserved formulations for high-dose regimens unless it cannot be avoided.^{1 2}

Myelosuppression

Possible suppressed hematopoiesis, anemia, aplastic anemia, pancytopenia, leukopenia, neutropenia, and/or thrombocytopenia (See Boxed Warning).^{1 2 3 4 5 6 265 269} Use with caution in patients with malignancy and preexisting hematopoietic impairment.² Perform CBCs at baseline and periodically throughout treatment;^{1 6 265 269} monitor patients for possible complications of myelosuppression.^{1 2 3 4 5 6 265 269} If myelosuppression occurs, dosage may need to be reduced, or the drug withheld or discontinued.^{1 2 3 4 5 6 265 269} If profound granulocytopenia and fever occur, evaluate patient immediately and consider initiating parenteral broad- spectrum antibiotic therapy.^{2 3 4}

Serious Infections

Life-threatening or fatal bacterial, fungal, or viral infections have occurred (See Boxed Warning).^{1 2 3 4 5 6 265 269} Immunizations administered during treatment may be ineffective;^{1 2 3 4 6} disseminated infections following administration of live vaccines in patients receiving methotrexate also reported.^{1 2 3 4 5 6 265 269} Administer all appropriate vaccines according to immunization guidelines prior to treatment initiation;^{1 5 265 269} live vaccines not recommended during treatment.^{1 2 3 4 5 6 265 269} Hypogammaglobulinemia reported rarely.^{3 4} Use with extreme caution in presence of active infection; powder for injection and injection for sub-Q use (Rasuvo and Otrexup) contraindicated in patients with overt or laboratory evidence of immunodeficiency syndromes.^{2 3 4} Monitor for signs and symptoms of infection during treatment; dose may need to be modified, withheld, or discontinued.^{1 3 4 5 6 265 269}

Renal Toxicity

May cause renal damage leading to irreversible acute renal failure (See Boxed Warning).^{1 2 3 4 5 6 265 269} Nephrotoxicity is due principally to precipitation of methotrexate and 7-hydroxymethotrexate in the renal tubules.^{2 3 4} Monitor renal function at baseline and periodically during treatment; withhold or discontinue methotrexate as needed if severe renal toxicity develops.^{1 2 3 4 5 6 265 269} Adequate hydration and urine alkalinization may help ensure safe administration.^{2 3 4} Follow recommendations to decrease risk of renal injury and mitigate renal toxicity in patients receiving high-dose methotrexate regimens.^{1 2} Consider administration of glucarpidase in patients with laboratory evidence of methotrexate toxicity and delayed clearance due to renal impairment.^{1 5 6 265 269}

Hepatotoxicity

Possible severe and potentially irreversible hepatotoxicity that may cause fibrosis, cirrhosis, and fatal liver failure (See Boxed Warning).^{1 2 3 4 5 6 265 269} Hepatotoxicity generally occurs after prolonged use (≥2 years)^{2 3 4} and after a total dose of ≥1.5 g.^{1 2 3 4 5 265 269} Acute elevations in liver enzymes occur frequently, and are usually transient and not associated with symptoms; such elevations do not appear to predict subsequent hepatic disease.^{2 3 4 6} Risk of hepatotoxicity in patients with psoriasis appears to be related to cumulative dose and may be enhanced by alcoholism, obesity, diabetes, and advanced age.^{2 3 4 6} Age at first use and duration of therapy reported as risk factors for hepatotoxicity in rheumatoid arthritis patients.^{2 3 4 6} Use with particular caution in patients with preexisting liver damage or hepatic impairment.^{1 2 3 4 5 6 265 269} Evaluate liver function prior to initiating therapy and throughout treatment.^{1 2 3 4 5 6 265 269} Perform pretreatment liver biopsy in patients with excessive alcohol consumption, chronic hepatitis B or C infection, or persistently elevated liver function tests at baseline.^{2 3 4} Liver biopsy should also be performed during treatment based on laboratory findings (e.g., persistent liver function abnormalities or a decrease in serum albumin below the normal range in those with well-controlled rheumatoid arthritis).^{2 3 4} Methotrexate may need to be withheld or discontinued as appropriate.^{1 2 3 4 5 6 265 269}

Neurotoxicity

Severe acute and chronic neurotoxicity, which can be progressive, irreversible, and fatal, reported (See Boxed Warning).^{1 2 3 4 5 265 269} Severe neurotoxic effects, manifested mainly by focal or generalized seizures, reported with increased frequency in pediatric patients receiving methotrexate.^{1 2 3 4} High-dose IV regimens, intrathecal administration, and low-dose regimens can cause leukoencephalopathy;^{1 2 3 4} risk of leukoencephalopathy further increased in those who have previously received cranial radiation.^{1 2 3 4 5 265 269} Transient acute stroke-like syndrome observed in patients receiving high-dosage regimens; manifestations of this stroke-like encephalopathy may include confusion, hemiparesis, transient blindness, seizures, and coma.^{1 2 3 4} Intrathecal administration may also cause acute chemical arachnoiditis (symptoms include headache, back pain, nuchal rigidity, and fever) or subacute myelopathy (symptoms include paraparesis or paraplegia).^{1 2 3 4} Monitor for neurotoxicity during treatment; withhold or discontinue therapy as appropriate.^{1 5 265 269} Avoid intrathecal administration of products that contain benzyl alcohol, which can increase the risk for serious neurotoxicity.¹

GI Toxicity

Risk of vomiting, diarrhea, stomatitis, hemorrhagic enteritis, and fatal intestinal perforation reported (See Boxed Warning); if severe GI toxicity occurs, withhold or discontinue drug and institute supportive care as appropriate.^{1 2 3 4 5 6 265 269} Use with caution in presence of peptic ulcer disease or ulcerative colitis.^{1 2 3 4 5 6 265 269}

Pulmonary Toxicity

Potentially fatal pulmonary toxicity (e.g., acute or chronic interstitial pneumonitis) may occur at any dosage at any time during therapy (See Boxed Warning).^{1 2 3 4 5 6 265 269} If manifestations (e.g., dry, nonproductive cough) occur, withhold or discontinue as appropriate.^{1 2 3 4 5 6 265 269}

Additional Boxed Warnings Unique to Specific Formulations

Powder for injection and Rasuvo (injection for sub-Q use) should only be used in select patients with severe disease (See Boxed Warning).^{2 3} Reserve treatment for life-threatening malignancies,² or psoriasis or rheumatoid arthritis that is severe, recalcitrant, disabling, and unresponsive to other forms of therapy; deaths have been reported when used for these indications.^{2 3} Inform patients of these risks.^{2 3} Patients should remain under a physician’s care throughout treatment.^{2 3} Use of high-dose regimens for treatment of osteosarcoma requires meticulous care; use of high-dose regimens for other malignancies is investigational.² Secondary malignant lymphomas reported in patients prescribed low-dose therapy; boxed warning included in prescribing information for powder for injection and Rasuvo (injection for sub-Q use) (See Boxed Warning).^{2 3} Lymphomas may regress following treatment discontinuation; institute appropriate treatment if lymphoma does not regress.^{2 3} Other formulations include a warning pertaining to this risk.^{1 4 5 6 265 269} Tumor lysis syndrome has occurred in patients with rapidly growing tumors; boxed warning included in prescribing information for powder for injection and Rasuvo(injection for sub-Q use) (See Boxed Warning).^{2 3} May be alleviated or prevented with appropriate supportive care and pharmacologic measures.^{2 3} Other formulations include a warning pertaining to this risk.^{1 4 5 265 269} Soft tissue necrosis and osteonecrosis have occurred with concomitant radiotherapy; boxed warning included in prescribing information for powder for injection and Rasuvo (injection for sub-Q use) (See Boxed Warning).^{2 3} Some other formulations include a warning pertaining to this risk.^{1 4 6}

Folic Acid Supplementation

Patients with neoplastic diseases: products containing folic acid or derivatives may reduce effectiveness of methotrexate; avoid unless clinically indicated.^{1 2 5 265 269} Patients with non-neoplastic diseases: Folate deficiency may increase likelihood of methotrexate-associated adverse reactions; administer concomitant folic acid or folinic acid.^{1 5 265 269}

Infertility

Impaired fertility, oligospermia, and menstrual dysfunction reported;^{1 2 3 4 5 6 265 269} unknown if reversible.^{1 3 4 5 6 265 269} Discuss risk of infertility with patients of reproductive potential prior to treatment initiation.^{1 2 3 4 5 6 265 269}

Increased Toxicity Due to Third Space Accumulation

Exits slowly from third-space compartments (e.g., pleural effusions, ascites), resulting in prolonged half-life and associated toxicity in patients with substantial third-space accumulations.^{1 2 3 4 5 6 265 269} Evacuation of fluid recommended before treatment.^{1 2 3 4 5 6 265 269}

Risk of Severe Adverse Reactions with Medication Errors

Serious adverse reactions, including death, have occurred due to medication errors (most commonly daily administration when a weekly regimen was prescribed).^{1 3 4 265 269} Verify dosage in all patients prescribed methotrexate.^{1 3 4 265 269} Measure oral solution using an accurate milliliter measuring device.^{5 6} A household teaspoon is not an accurate measuring device, and use of such could result in overdosage leading to serious adverse reactions.^{5 6} Advise patients to ask their pharmacist to recommend an appropriate measuring device and counsel on how to use it.⁶

Dizziness and Fatigue

Dizziness and fatigue reported with powder for injection and injection for sub-Q use (Rasuvo and Otrexup); can affect ability to drive or operate machinery.^{2 3 4}

Specific Populations

Pregnancy

Abortion, fetal death, and/or congenital anomalies have occurred, especially during the first trimester.¹ Methotrexate contraindicated in the management of all non-neoplastic disorders (i.e., psoriasis or rheumatoid arthritis [including polyarticular juvenile idiopathic arthritis]) in pregnant women.^{1 2 3 4 5 6 265 269} Verify pregnancy status prior to treatment initiation.^{1 2 3 4 5 6 265 269} Advise female patients of reproductive potential to use effective contraception during treatment and for 6 months after discontinuation; advise males with such female partners to use effective contraception during treatment and for 3 months after discontinuation.^{1 2 3 4 5 6 265 269} Inform women of childbearing potential of the potential hazard to the fetus.^{1 2 3 4 5 6 265 269}

If methotrexate injection is administered to treat a neoplastic disease in a pregnant patient, use a preservative-free formulation when possible.¹

Lactation

Distributed into milk; reported breast milk to plasma concentration ratio as high as 0.08:1.^{1 2 3 4 5 6 265 269} Potential effects on the breast-fed infant or on milk production not known.^{1 3 4 5 6 265 269} Powder for injection is contraindicated in nursing women because of risk to nursing infant.² Advise patients taking all other formulations to avoid breast-feeding during treatment and for 1 week after discontinuation.^{1 3 4 5 6 265 269}

Females and Males of Reproductive Potential

Defective oogenesis or spermatogenesis, oligospermia, menstrual dysfunction, and infertility reported.^{1 3 4 5 6 265 269} Can cause fetal malformations and fetal death when administered during pregnancy.^{1 3 4 5 6 265 269} Can cause chromosomal damage to sperm cells.^{1 3 4 5 6 265 269}

Verify pregnancy status prior to treatment initiation.^{1 2 3 4 5 6 265 269} Advise female patients of reproductive potential to use effective contraception during treatment and for 6 months after discontinuation.^{1 2 3 4 5 6 265 269} Advise male patients with such female partners to use effective contraception during treatment and for 3 months following discontinuation.^{1 2 3 4 5 6 265 269}

Pediatric Use

Safety and efficacy established (all formulations) in pediatric patients for treatment of polyarticular juvenile idiopathic arthritis.^{1 2 3 4 5 6 265 269}

Safety and efficacy also established for injection and powder for injection in pediatric patients for treatment of acute lymphoblastic leukemia (ALL), meningeal leukemia prophylaxis and treatment, non-Hodgkin lymphoma, and osteosarcoma.^{1 2} Severe neurotoxic effects (e.g., focal or generalized seizures) reported in pediatric patients with ALL who received intermediate-dose IV therapy (1 g/m²).^{1 2} Safety and efficacy of injection and powder for injection have not been established in pediatric patients for other types of cancer, including breast cancer, squamous cell carcinoma of the head and neck, and gestational trophoblastic diseases.^{1 2}

Safety and efficacy of oral solution and tablets established in pediatric patients for the treatment of ALL, but not established for treatment of other neoplastic diseases.^{5 6 265 269} Safety and efficacy of Rasuvo and Otrexup (methotrexate injection for sub-Q use) not established in pediatric patients for treatment of any neoplastic diseases.^{3 4}

Safety and efficacy (all formulations) not established in pediatric patients for treatment of rheumatoid arthritis or psoriasis.^{1 2 3 4 5 6 265 269}

Geriatric Use

Insufficient experience in patients ≥65 years of age to determine whether geriatric patients respond differently than younger adults;^{1 2 3 4 5 6 265 269} select dosage with caution due to greater frequency of decreased hepatic and renal function and folate stores and possibility of concomitant diseases and drug therapy observed in the elderly.^{2 3 4} Occurrence of bone marrow suppression, thrombocytopenia, and pneumonitis may increase with age.^{2 3 4}

Hepatic Impairment

Pharmacokinetics not known in patients with hepatic impairment.^{1 3 4 5 6 265 269} Powder for injection and injection for sub-Q use (Rasuvo and Otrexup) contraindicated in patients with psoriasis or rheumatoid arthritis who have alcoholism, alcoholic liver disease, or other chronic liver disease.^{2 3 4} Patients with obesity, diabetes, hepatic fibrosis, or steatohepatitis at increased risk for hepatic injury and fibrosis from methotrexate; monitor such patients closely.^{3 4} Consider dosage reduction or discontinuance in patients with hepatic impairment.^{1 3 5 6 265 269}

Renal Impairment

Elimination reduced with renal impairment (i.e., Cl_cr <90 mL/minute using the Cockcroft-Gault calculation).^{1 3 5 6 265 269} Follow recommendations to promote methotrexate elimination and decrease risk of acute kidney injury and other toxicities in patients receiving intermediate- or high-dose regimens.¹ Carefully monitor patients with renal impairment during treatment; consider dosage reduction or discontinuance in patients with renal impairment.^{1 3 4 5 6 265 269}

Debilitated Patients

Use with caution.^{2 3 4}

Common Adverse Effects

The most common adverse effects reported in patients receiving methotrexate injection, powder for injection, oral solution, and tablets include ulcerative stomatitis, leukopenia, nausea, and abdominal distress.^{1 2 5 6 265 269} Elevated liver function tests are also commonly reported in patients receiving Xatmep oral solution.⁶

The most common adverse effects reported in patients receiving methotrexate injection for sub-Q use include nausea, abdominal pain, dyspepsia, stomatitis/mouth sores, rash, nasopharyngitis, diarrhea, liver function test abnormalities, vomiting, headache, bronchitis, thrombocytopenia, alopecia, leukopenia, pancytopenia, dizziness, photosensitivity, and "burning of skin lesions."^{3 4}

Drug Interactions

Protein-bound Drugs and Weak Organic Acids

Possible increased methotrexate toxicity because of displacement from protein binding sites.^{1 2 3 4 5 265 269} If coadministration cannot be avoided, monitor for adverse reactions from methotrexate during therapy.^{1 5 265 269}

Hepatotoxic Agents

Increase in adverse effects expected.^{1 2 3 4 5 265 269} If coadministration cannot be avoided, monitor for adverse reactions from methotrexate during therapy.^{1 2 3 4 5 6 265 269}

Nephrotoxic Drugs

Increase in adverse effects expected.^{1 2 3 4 5 265 269} If coadministration cannot be avoided, monitor for adverse reactions from methotrexate during therapy.^{1 2 3 4 5 6 265 269}

Specific Drugs

Methotrexate Pharmacokinetics

Absorption

Bioavailability

Oral absorption appears to be highly variable and dose dependent.^{2 3 6} At lower doses (i.e., ≤30 mg/m²), dose is well absorbed with a mean bioavailability of approximately 60%. ^{2 3 5 265 269} Bioavailability decreases with increasing oral doses; absorption may be substantially reduced at doses >80 mg/m².^{2 3}

Appears to be completely absorbed following parenteral administration.^{2 3} Peak serum concentrations attained within 0.75-6 hours after oral administration^{2 5 265 269} and 30–60 minutes after IM administration.^{2 3 4}

Food

Food delays absorption and decreases peak serum concentrations following oral administration. ^{2 3 4 5 6 265 269}

Distribution

Extent

Actively transported across cell membranes.^{1 2 3 4 6} At concentrations >0.1 µmol/mL, passive diffusion becomes a major means of intracellular transport.^{1 2 3 4 6}

Does not reach therapeutic concentrations in the CSF when administered orally or parenterally;^{1 2 3 4 5 6 265 269} high CSF concentrations can be attained following intrathecal administration.^{2 3 4}

Plasma Protein Binding

About 50%.^{1 2 3 4 5 6 265 269}

Elimination

Metabolism

Undergoes hepatic and intracellular metabolism to polyglutamate metabolites;^{1 2 3 4 5 6 269} partially metabolized by intestinal flora after oral administration. ^{2 3 4 5 6 265 269}

Polyglutamate metabolites may be converted back to methotrexate by hydrolysis,^{1 2 3 4 5 6 269} and metabolites may remain in tissues for extended periods of time.^{1 2 3 4 5 6 265}

Elimination Route

Excreted principally by the kidneys (up to 90%) and to a lesser extent via feces (≤10%).^{1 2 3 4 5 6 265 269}

Half-life

At low-doses (<30 mg/m²), terminal half-life is about 3–10 hours.^{1 2 3 4 5 6 265 269} At high IV doses, elimination half-life is about 8–15 hours in adults.^{1 2 3 4} In pediatric patients, terminal half-life ranges from 0.7-5.8 hours in those with acute lymphoblastic leukemia or 0.9-2.3 hours in those with polyarticular juvenile idiopathic arthritis.^{1 3 4 5 6 265 269}

Stability

Storage

Oral

Solution

Jylamvo (methotrexate 2 mg/mL oral solution): 20–25°C; excursions permitted between 15–30°C.⁵ Once in use, store at 20–25°C and keep bottle tightly closed.⁵ Discard any unused medicine after 3 months from date of opening.⁵ Xatmep (methotrexate 2.5 mg/mL oral solution): 2–8°C, tightly closed in the original container.⁶ Once dispensed, can be stored refrigerated at 2–8°C or at room temperature at 20–25°C, with excursions permitted between 15–30°C.⁶ Discard any unused medicine after 60 days if stored at room temperature.⁶ Avoid freezing and exposure to excessive heat.⁶

Tablets

2.5 mg tablets: 20–25°C; excursions permitted between 15–30°C.²⁶⁵

High-dose tablets (Trexall): 20–25°C.²⁶⁹ Protect from light.²⁶⁹

Parenteral

Injection

20–25°C.¹ Protect from light.¹

Use preservative-free solution immediately after further dilution.¹

Injection, for Sub-Q Use

20–25°C (excursions permitted between 15–30°C).^{3 4} Protect from light.^{3 4}

Powder for Injection

20–25°C.² Protect from light.²

Actions

• Methotrexate and its polyglutamate metabolites reversibly inhibit dihydrofolate reductase (enzyme that reduces folic acid to tetrahydrofolic acid); inhibition of tetrahydrofolate formation limits availability of one-carbon fragments necessary for synthesis of purines and pyrimidines and various other reactions necessary for DNA synthesis and cell reproduction.⁴³

• In cancer, malignant cells are unable to synthesize DNA and RNA without purine and pyrimidine precursors and thus, become unable to proliferate.⁴³

• Tissues with high rates of cellular proliferation (e.g., neoplasms, buccal and intestinal mucosa, bone marrow, bladder, fetal cells) are most sensitive.¹

• Mechanism(s) of action in rheumatoid arthritis, polyarticular juvenile idiopathic arthritis, and psoriasis not known; however, may have effects on immune system.^{1 3}

Advice to Patients

• Advise patients to read the FDA-approved patient labeling (Patient Information).^{1 2 3 4 5 265 269}

• Inform patients of the risks of infections and organ toxicity, including gastrointestinal, hematologic, hepatic, neurologic, pulmonary, renal, and skin toxicity, as well as possible signs and symptoms for which they should contact their healthcare provider.^{3 4} Advise patients of the need for close follow-up, including periodic laboratory tests to monitor toxicity.³

• For patients prescribed a once weekly regimen of methotrexate, advise patients and caregivers that the dose is taken once weekly and that mistaken daily use of the recommended dose has led to fatal toxicity.^{3 4 5 6 265 269}

• Rasuvo and Otrexup are intended for use under the guidance and supervision of a physician.^{3 4} Patients should not self-administer until they receive training from a healthcare professional.^{3 4} Assess the patient or caregiver's ability to administer these medications.^{3 4}

• When administering Rasuvo and Otrexup, patients should be instructed to use administration sites on the abdomen or the thigh.^{3 4} Administration should not be made within 2 inches of the navel.^{3 4} Instruct patients not to administer to the arms or any other areas of the body, as delineated in the Instructions for Use.^{3 4}

• Advise patients of the potential risk of hypersensitivity and that methotrexate is contraindicated in patients with a history of severe hypersensitivity to methotrexate.^{1 5 6 265 269} Advise patients to seek immediate medical attention if signs or symptoms of a hypersensitivity reaction occur.^{1 5 6 265 269}

• Inform patients and their caregivers that methotrexate can cause myelosuppression and that frequent monitoring of blood cell counts is needed.^{5 265 269} Advise patients to contact their healthcare provider immediately for new onset fever, symptoms of infection, easy bruising, or persistent bleeding.^{1 3 4 5 6 265 269}

• Inform patients that adverse reactions such as dizziness and fatigue may affect their ability to drive or operate machinery.^{3 4}

• Advise patients that methotrexate can cause renal toxicity. Advise patients to immediately contact their healthcare provider for signs or symptoms of renal toxicity, such as marked increases or decreases in urinary output.

• Advise patients to report signs or symptoms of hepatic toxicity and to avoid alcohol during methotrexate treatment.^{1 3 4 5 6 265 269}

• Advise patients to contact their healthcare provider immediately if they develop new neurological symptoms.^{1 3 4 5 6 265 269}

• Advise patients to contact their healthcare provider if they develop diarrhea, vomiting, or stomatitis.^{1 3 4 5 6 265 269} Advise patients to immediately contact their healthcare provider for high fever, rigors, persistent or severe abdominal pain, severe constipation, hematemesis, or melena.^{1 3 4 5 6 265 269}

• Advise patients to contact their healthcare provider for new or worsening symptoms of cough, fever, and dyspnea.^{1 3 4 5 6 265 269}

• Advise patients that methotrexate injection can cause serious skin rash and to immediately contact their healthcare provider for new or worsening skin rash.^{1 5 6 265 269} Advise patients to avoid excessive sun exposure and to use sun protection measures.^{1 5 265 269}

• Advise patients on the risk of second primary malignancies during treatment with methotrexate.^{1 5 6 265 269}

• Advise patients to avoid receiving vaccines during treatment with methotrexate because they may not be effective and live virus vaccines may cause infection.^{5 6}

• Advise women to inform their clinician if they are or plan to become pregnant.^{1 3 4 5 265 269} Advise females of reproductive potential that methotrexate should not be started until pregnancy is excluded.^{1 3 4 5 265 269}

• Advise women to inform their clinician if they are or plan to breast-feed.^{1 3 4 5 265 269} Advise women not to breast-feed during treatment with methotrexate[r6] and for 1 week after the final dose.^{1 3 4 5 265 269}

• Advise females and males of reproductive potential that methotrexate may cause impairment of fertility.^{1 3 4 5 6 265 269} Methotrexate can also cause oligospermia and menstrual dysfunction.^{3 4 5}

• Advise females of reproductive potential to use effective contraception during methotrexate therapy and for 6 months after the final dose.^{1 3 4 5 6 265 269} Advise males of reproductive potential to use effective contraception during methotrexate therapy and for 3 months after the final dose.^{1 3 4 5 6 265 269}

• Advise patients to inform their clinician of existing or contemplated concomitant therapy, including prescription and OTC drugs and dietary and herbal supplements, as well as any concomitant illnesses.^{1 5 265 269}

• Instruct patients being treated for neoplastic indications to not take products containing folic acid or folinic acid unless directed to do so by their healthcare provider.¹

• Advise patients on how to properly store and dispose of methotrexate products.^{3 4 5 6} Inform patients and caregivers of the need for proper disposal of Rasuvo and Otrexup after use, including the use of a sharps disposal container.^{3 4}

• Instruct patients and caregivers how to measure, dose, and administer the recommended dosage of methotrexate oral solution using an appropriate measuring device and that a household teaspoon is not an appropriate measuring device.^{5 6}

• Advise patients of other important precautionary information.^{1 2 3 4 5 6 265 269}

Additional Information

The American Society of Health-System Pharmacists, Inc. represents that the information provided in the accompanying monograph was formulated with a reasonable standard of care, and in conformity with professional standards in the field. Readers are advised that decisions regarding use of drugs are complex medical decisions requiring the independent, informed decision of an appropriate health care professional, and that the information contained in the monograph is provided for informational purposes only. The manufacturer’s labeling should be consulted for more detailed information. The American Society of Health-System Pharmacists, Inc. does not endorse or recommend the use of any drug. The information contained in the monograph is not a substitute for medical care. For further information on the handling of antineoplastic agents, see the ASHP Guidelines on Handling Hazardous Drugs at [Web].

Preparations

Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.

Please refer to the ASHP Drug Shortages Resource Center for information on shortages of one or more of these preparations.

* available from one or more manufacturer, distributor, and/or repackager by generic (nonproprietary) name

Frequently asked questions

• Why should I take folic acid with methotrexate?
• What causes Plaque Psoriasis?
• How long does it take for methotrexate to work?
• Does methotrexate cause weight gain?
• How do I know if methotrexate is working for rheumatoid arthritis?
• What are the different brands of methotrexate?
• How long does methotrexate stay in your system?
• How does methotrexate work for ectopic pregnancy?

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