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(his TREL in)

Index Terms

  • GnRH Agonist
  • Histrelin Acetate
  • LH-RH Agonist

Dosage Forms

Excipient information presented when available (limited, particularly for generics); consult specific product labeling.

Kit, Subcutaneous:

Supprelin LA: 50 mg

Vantas: 50 mg

Brand Names: U.S.

  • Supprelin LA
  • Vantas

Pharmacologic Category

  • Antineoplastic Agent, Gonadotropin-Releasing Hormone Agonist
  • Gonadotropin Releasing Hormone Agonist


Potent inhibitor of gonadotropin secretion; continuous administration results in, after an initiation phase, the suppression of luteinizing hormone (LH), follicle-stimulating hormone (FSH), and a subsequent decrease in testosterone and dihydrotestosterone (males) and estrone and estradiol (premenopausal females). Testosterone levels are reduced to castrate levels in males (treated for prostate cancer) within 2 to 4 weeks. Additionally, in patients with CPP, linear growth velocity is slowed (improves chance of attaining predicted adult height).


Adults: Vd: ~58 L


Hepatic via C-terminal dealkylation and hydrolysis

Onset of Action

Prostate cancer: Chemical castration: Within 2 to 4 weeks; CPP: Progression of sexual development stops and growth is decreased within 1 month

Time to Peak

Adults: 12 hours

Duration of Action

12 months (plus a few additional weeks of histrelin release)

Half-Life Elimination

Adults: Terminal: ~4 hours

Protein Binding

Adults: 70% ± 9%

Special Populations: Renal Function Impairment

Average serum histrelin concentrations are approximately 50% higher in patients with renal function impairment.

Use: Labeled Indications

Central precocious puberty: Treatment of central precocious puberty (CPP) in children

Prostate cancer, advanced: Palliative treatment of advanced prostate cancer


Hypersensitivity to histrelin acetate, gonadotropin releasing hormone (GnRH), GnRH-agonist analogs, or any component of the formulation; females who are or may become pregnant

Dosing: Adult

Prostate cancer, advanced (Vantas): SubQ: 50 mg implant surgically inserted every 12 months

Dosing: Geriatric

Refer to adult dosing.

Dosing: Pediatric

Central precocious puberty (CPP) (Supprelin LA): Children ≥2 years: SubQ: 50 mg implant surgically inserted every 12 months. Discontinue at the appropriate time for the onset of puberty.

Dosing: Renal Impairment

Vantas: CrCl ≥15 mL/minute: No dosage adjustment necessary.

Supprelin LA: There are no dosage adjustments provided in the manufacturers' labeling.

Dosing: Hepatic Impairment

There are no dosage adjustments provided in the manufacturer's labeling (has not been studied).


The implant may be slightly curved when removed from refrigerator; may roll implant (in sterile-gloved hands) a few times between fingers and thumb. If resistance is felt when inserting implant into insertion tool cannula, remove and manually manipulate or roll as needed and reinsert into cannula.

Hazardous agent; use appropriate precautions for handling and disposal (meets NIOSH 2014 criteria).


SubQ: Surgical implantation (using a sterile field) into the inner portion of the upper arm requires the use of the implantation device provided. Use the patient's nondominant arm for placement; implant should be placed halfway between the shoulder and the elbow at the crease between the tricep and the bicep. Implant removal should occur after ~12 months; a replacement implant may be inserted if therapy is to be continued. Palpate area of incision to locate implant for removal. If not readily palpated, ultrasound, CT or MRI may be used to locate implant; plain films are not recommended because the implant is not radiopaque. Refer to manufacturer’s labeling for full insertion and removal details.

Hazardous agent; use appropriate precautions for handling and disposal (meets NIOSH 2014 criteria).


Upon delivery, separate contents of implant carton. Store implant under refrigeration at 2°C to 8°C (36°F to 46°F); excursions permitted to 25°C (77°F) for 7 days (if unused within 7 days, may return to proper refrigeration until product expiration date). Keep implant wrapped in the amber pouch for protection from light; do not freeze. The implantation insertion kit does not require refrigeration.

Drug Interactions

Antidiabetic Agents: Hyperglycemia-Associated Agents may diminish the therapeutic effect of Antidiabetic Agents. Monitor therapy

Choline C 11: Luteinizing Hormone-Releasing Hormone Analogs may diminish the therapeutic effect of Choline C 11. Monitor therapy

Corifollitropin Alfa: Luteinizing Hormone-Releasing Hormone Analogs may enhance the therapeutic effect of Corifollitropin Alfa. Avoid combination

Highest Risk QTc-Prolonging Agents: QTc-Prolonging Agents (Indeterminate Risk and Risk Modifying) may enhance the QTc-prolonging effect of Highest Risk QTc-Prolonging Agents. Management: Avoid such combinations when possible. Use should be accompanied by close monitoring for evidence of QT prolongation or other alterations of cardiac rhythm. Consider therapy modification

Indium 111 Capromab Pendetide: Luteinizing Hormone-Releasing Hormone Analogs may diminish the diagnostic effect of Indium 111 Capromab Pendetide. Avoid combination

MiFEPRIStone: May enhance the QTc-prolonging effect of QTc-Prolonging Agents (Indeterminate Risk and Risk Modifying). Management: Though the drugs listed here have uncertain QT-prolonging effects, they all have some possible association with QT prolongation and should generally be avoided when possible. Consider therapy modification

Moderate Risk QTc-Prolonging Agents: QTc-Prolonging Agents (Indeterminate Risk and Risk Modifying) may enhance the QTc-prolonging effect of Moderate Risk QTc-Prolonging Agents. Monitor therapy

Test Interactions

Results of diagnostic test of pituitary gonadotropic and gonadal functions may be affected during and after therapy

Adverse Reactions


>10%: Local: Insertion site reaction (51%; includes bruising, discomfort, itching, pain, protrusion of implant area, soreness, swelling, tingling)

>2% to 10%:

Endocrine & metabolic: Metrorrhagia (4%)

Local: Keloid scar (6%), scar (6%), suture-related complication (6%), pain at the application site (4%), post procedural pain (4%)

≤2% (Limited to important or life-threatening): Amblyopia, breast tenderness, cold feeling, disease progression, dysmenorrhea, epistaxis, erythema, flu-like syndrome, gynecomastia, headache, infection at the implant site, menorrhagia, migraine, mood swings, pituitary adenoma, pituitary apoplexy, pruritus, seizures, weight gain

Prostate cancer:


Endocrine & metabolic: Hot flashes (66%)

Local: Implant site reaction (6% to 14%; includes bruising, erythema, pain, soreness, swelling, tenderness)

2% to 10%:

Central nervous system: Fatigue (10%), headache (3%), insomnia (3%)

Endocrine & metabolic: Gynecomastia (4%), sexual dysfunction (4%), libido decreased (2%)

Gastrointestinal: Constipation (4%), weight gain (2%)

Genitourinary: Expected pharmacological consequence of testosterone suppression: Testicular atrophy (5%)

Renal: Renal impairment (5%)

<2% (Limited to important or life-threatening): Abdominal discomfort, alopecia, anemia, appetite increased, arthralgia, AST increased, back pain, bone density decreased, bone pain, breast pain, breast tenderness, cold feeling, contusion, craving food, creatinine increased, depression, diaphoresis, dizziness, dyspnea (exertional), dysuria, fluid retention, flushing, genital pruritus, hematoma, hematuria, hepatic injury (severe), hypercalcemia, hypercholesterolemia, hyperglycemia, irritability, LDH increased, lethargy, limb pain, liver disorder, malaise, muscle twitching, myalgia, nausea, neck pain, night sweats, pain, palpitation, peripheral edema, prostatic acid phosphatase increased, pruritus, pituitary apoplexy, renal calculi, renal failure, stent occlusion, testosterone increased, tremor, urinary frequency, urinary retention, ventricular asystoles, weakness, weight loss


Concerns related to adverse effects:

• Cardiovascular effects: Androgen-deprivation therapy (ADT) may increase the risk for cardiovascular disease (Levine, 2010). An increased risk of MI, sudden cardiac death, and stroke has been reported with GnRH agonist use in men; monitor for symptoms associated with cardiovascular disease. ADT may prolong the QT/QTc interval; consider the benefits of ADT versus the risk for QT prolongation in patients with a history of QTc prolongation, congenital long QT syndrome, heart failure, frequent electrolyte abnormalities, and in patients with medications known to prolong the QT interval, or with pre-existing cardiac disease. Consider periodic monitoring of electrocardiograms and electrolytes in at-risk patients.

• Hyperglycemia: Hyperglycemia has been reported with androgen deprivation therapy (in prostate cancer) and may manifest as diabetes or worsening of preexisting diabetes. Monitor blood glucose and/or HbA1c.

• Pituitary apoplexy: Rare cases of pituitary apoplexy (frequently secondary to pituitary adenoma) have been observed with GnRH agonist administration (onset from 1 hour to usually <2 weeks); may present as sudden headache, vomiting, visual or mental status changes, and infrequently cardiovascular collapse; immediate medical attention required.

• Spinal cord compression: Has been reported, may contribute to paralysis when used for prostate cancer; closely observe patients with metastatic vertebral lesions for weakness and paresthesias in first few weeks of therapy.

• Tumor flare: Transient increases in serum testosterone (in men with prostate cancer) occur during the first week of use and may result in a worsening of disease signs and symptoms (bone pain, neuropathy, hematuria, ureteral/bladder outlet obstruction, spinal cord compression) during the first week of treatment.

• Urinary tract obstruction: Ureteral obstruction may occur when used for prostate cancer; closely observe patients for urinary tract obstruction or poor urine output in first few weeks of therapy.

• Worsening of symptoms: Transient increases in estradiol serum levels (female) or testosterone levels (female and male) may occur during the first week of use for central precocious puberty (CPP); however, manifestations of puberty should decrease within 4 weeks.

Disease-related concerns:

• Hepatic impairment: Safety and efficacy have not been established in prostate cancer patients with hepatic dysfunction.

Concurrent drug therapy issues:

• Drug-drug interactions: Potentially significant interactions may exist, requiring dose or frequency adjustment, additional monitoring, and/or selection of alternative therapy. Consult drug interactions database for more detailed information.

Special handling:

• Hazardous agent: Use appropriate precautions for handling and disposal (meets NIOSH 2014 criteria).

Other warnings/precautions:

• Implant complications: Proper surgical insertion technique is essential to avoid complications. Patients should keep arm dry for 24 hours and avoid heavy lifting/strenuous exertion of insertion arm for 7 days after implantation. In prostate cancer studies, the implant was not recovered in a small number of patients. Serum testosterone rose above castrate level and the implant was not palpable or visualized (via ultrasound); it was believed to have been extruded. Some patients had continued testosterone levels below castration level even though the implant was not palpable. If the implant breaks during removal in children with CPP, the remaining pieces should be removed; confirm the removal of the entire implant (refer to manufacturer’s instructions for removal procedure).

Monitoring Parameters

CPP: LH, FSH, estradiol, or testosterone (after 1 month then every 6 months); height, bone age (every 6 to 12 months); tanner staging; monitor for clinical evidence of suppression of CPP manifestations

Prostate cancer: Serum testosterone levels, prostate specific antigen (PSA); bone mineral density; weakness, paresthesias, and urinary tract obstruction (especially during first few weeks of therapy); screen for diabetes; monitor for symptoms associated with cardiovascular disease. Consider periodic monitoring of electrocardiograms and electrolytes.

Pregnancy Risk Factor


Pregnancy Considerations

Adverse events were observed in animal reproduction studies. May cause fetal harm or spontaneous abortion if administered during pregnancy. Histrelin is contraindicated for use during pregnancy or in women who may become pregnant.

Patient Education

• Discuss specific use of drug and side effects with patient as it relates to treatment. (HCAHPS: During this hospital stay, were you given any medicine that you had not taken before? Before giving you any new medicine, how often did hospital staff tell you what the medicine was for? How often did hospital staff describe possible side effects in a way you could understand?)

• Patient may experience application site irritation, loss of strength or energy, or constipation. Have patient report immediately to prescriber signs of high blood sugar (confusion, feeling sleepy, more thirst, hunger, passing urine more often, flushing, fast breathing, or breath that smells like fruit), signs of severe cerebrovascular disease (change in strength on one side is greater than the other, trouble speaking or thinking, change in balance, or change in eyesight), burning or numbness feeling, urinary retention, change in amount of urine passed, painful urination, hematuria, bone pain, weakness, difficulty moving, severe dizziness, passing out, tachycardia, arrhythmia, or angina (HCAHPS).

• Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat). Note: This is not a comprehensive list of all side effects. Patient should consult prescriber for additional questions.

Intended Use and Disclaimer: Should not be printed and given to patients. This information is intended to serve as a concise initial reference for health care professionals to use when discussing medications with a patient. You must ultimately rely on your own discretion, experience, and judgment in diagnosing, treating, and advising patients.