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Conivaptan

Pronunciation

(koe NYE vap tan)

Index Terms

  • Conivaptan HCl/D5W
  • Conivaptan Hydrochloride
  • YM087

Dosage Forms

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

Solution, Intravenous, as hydrochloride:

Vaprisol: 20 mg (100 mL)

Brand Names: U.S.

  • Vaprisol

Pharmacologic Category

  • Vasopressin Antagonist

Pharmacology

Conivaptan is an arginine vasopressin (AVP) receptor antagonist with affinity for AVP receptor subtypes V1A and V2. The antidiuretic action of AVP is mediated through activation of the V2 receptor, which functions to regulate water and electrolyte balance at the level of the collecting ducts in the kidney. Serum levels of AVP are commonly elevated in euvolemic or hypervolemic hyponatremia, which results in the dilution of serum sodium and the relative hyponatremic state. Antagonism of the V2 receptor by conivaptan promotes the excretion of free water (without loss of serum electrolytes) resulting in net fluid loss, increased urine output, decreased urine osmolality, and subsequent restoration of normal serum sodium concentrations.

Metabolism

Hepatic via CYP3A4 to four minimally-active metabolite

Excretion

Feces (~83%); urine (12%)

Half-Life Elimination

5.3 to 8.1 hours

Protein Binding

99%

Special Populations: Hepatic Function Impairment

AUC increased (2.3 to 2.5-fold) and plasma protein binding decreased (~27% and 50%) respectively in moderate and severe hepatic impairment.

Use: Labeled Indications

Euvolemic or hypervolemic hyponatremia: Treatment of euvolemic and hypervolemic hyponatremia in hospitalized patients.

Limitations of use: Has not been shown to be effective for the treatment of the signs and symptoms of heart failure and is not approved for this indication. It has not been established that raising serum sodium with conivaptan provides a symptomatic benefit to patients.

Contraindications

Hypovolemic hyponatremia; concurrent use with strong CYP3A4 inhibitors (eg, ketoconazole, itraconazole, ritonavir, indinavir, and clarithromycin); anuria.

Dosing: Adult

Euvolemic or hypervolemic hyponatremia: IV: 20 mg infused over 30 minutes as a loading dose, followed by a continuous infusion of 20 mg over 24 hours (0.83 mg/hour) for 2 to 4 days; may increase to a maximum dose of 40 mg over 24 hours (1.7 mg/hour) if serum sodium not rising sufficiently; total duration of therapy not to exceed 4 days. Note: If patient requires 40 mg/24 hours, may administer two consecutive 20 mg/100 mL premixed solutions over 24 hours (ie, 20 mg over 12 hours followed by 20 mg over 12 hours).

Dosing: Geriatric

Refer to adult dosing.

Dosing: Renal Impairment

CrCl ≥30mL/minute: No dosage adjustment necessary.

CrCl <30 mL/minute: Use not recommended; contraindicated in anuria.

Dosing: Hepatic Impairment

Mild impairment (Child-Pugh class A): No dosage adjustment necessary.

Moderate (Child-Pugh class B) and severe (Child-Pugh class C) impairment: 10 mg infused over 30 minutes as a loading dose, followed by a continuous infusion of 10 mg over 24 hours (0.42 mg/hour) for 2 to 4 days; may increase to a maximum dose of 20 mg over 24 hours (0.83 mg/hour) if serum sodium not rising sufficiently; total duration of therapy not to exceed 4 days.

Administration

For intravenous use only; infuse into large veins and change infusion site every 24 hours to minimize vascular irritation. Do not administer with any other product in the same intravenous line or container.

Compatibility

Stable in D5W

Y-site administration: Incompatible with LR and furosemide.

Storage

Store at 25°C (77°F); brief excursions permitted up to 40°C (104°F). Avoid excessive heat. Protect from light and freezing. Do not remove protective overwrap until ready for use.

Drug Interactions

Amifostine: Blood Pressure Lowering Agents may enhance the hypotensive effect of Amifostine. Management: When amifostine is used at chemotherapy doses, blood pressure lowering medications should be withheld for 24 hours prior to amifostine administration. If blood pressure lowering therapy cannot be withheld, amifostine should not be administered. Consider therapy modification

Antipsychotic Agents (Second Generation [Atypical]): Blood Pressure Lowering Agents may enhance the hypotensive effect of Antipsychotic Agents (Second Generation [Atypical]). Monitor therapy

Apixaban: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Apixaban. Monitor therapy

Aprepitant: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Aprepitant. Avoid combination

Asunaprevir: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Asunaprevir. Avoid combination

Barbiturates: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Benperidol: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Blood Pressure Lowering Agents: May enhance the hypotensive effect of Hypotension-Associated Agents. Monitor therapy

Bosentan: May decrease the serum concentration of CYP3A4 Substrates. Monitor therapy

Bosentan: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Bosentan. Management: Concomitant use of both a CYP2C9 inhibitor and a CYP3A inhibitor or a single agent that inhibits both enzymes with bosentan is likely to cause a large increase in serum concentrations of bosentan and is not recommended. See monograph for details. Monitor therapy

Bosutinib: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Bosutinib. Avoid combination

Brimonidine (Topical): May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Budesonide (Systemic): CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Budesonide (Systemic). Avoid combination

Budesonide (Topical): CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Budesonide (Topical). Management: Per US prescribing information, avoid this combination. Canadian product labeling does not recommend strict avoidance. If combined, monitor for excessive glucocorticoid effects as budesonide exposure may be increased. Consider therapy modification

Cannabis: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Cannabis. More specifically, tetrahydrocannabinol and cannabidiol serum concentrations may be increased. Monitor therapy

Cobimetinib: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Cobimetinib. Management: Avoid the concomitant use of cobimetinib and moderate CYP3A4 inhibitors. If concurrent short term (14 days or less) use cannot be avoided, reduce the cobimetinib dose to 20 mg daily. Avoid combination

CYP3A4 Inducers (Moderate): May decrease the serum concentration of CYP3A4 Substrates. Monitor therapy

CYP3A4 Inducers (Strong): May increase the metabolism of CYP3A4 Substrates. Management: Consider an alternative for one of the interacting drugs. Some combinations may be specifically contraindicated. Consult appropriate manufacturer labeling. Consider therapy modification

CYP3A4 Inhibitors (Moderate): May decrease the metabolism of CYP3A4 Substrates. Monitor therapy

CYP3A4 Inhibitors (Strong): May increase the serum concentration of Conivaptan. Avoid combination

CYP3A4 Substrates: Conivaptan may increase the serum concentration of CYP3A4 Substrates. Avoid combination

Deferasirox: May decrease the serum concentration of CYP3A4 Substrates. Monitor therapy

Diazoxide: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Digoxin: Conivaptan may increase the serum concentration of Digoxin. Monitor therapy

Dofetilide: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Dofetilide. Monitor therapy

Domperidone: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Domperidone. Avoid combination

Dronabinol: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Dronabinol. Monitor therapy

DULoxetine: Blood Pressure Lowering Agents may enhance the hypotensive effect of DULoxetine. Monitor therapy

Enzalutamide: May decrease the serum concentration of CYP3A4 Substrates. Management: Concurrent use of enzalutamide with CYP3A4 substrates that have a narrow therapeutic index should be avoided. Use of enzalutamide and any other CYP3A4 substrate should be performed with caution and close monitoring. Consider therapy modification

Flibanserin: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Flibanserin. Avoid combination

Fusidic Acid (Systemic): May increase the serum concentration of CYP3A4 Substrates. Avoid combination

Herbs (Hypotensive Properties): May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

HydrOXYzine: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of HydrOXYzine. Management: This combination is specifically contraindicated in some non-U.S. labeling. Consider therapy modification

Hypotension-Associated Agents: Blood Pressure Lowering Agents may enhance the hypotensive effect of Hypotension-Associated Agents. Monitor therapy

Ibrutinib: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Ibrutinib. Management: If a moderate CYP3A inhibitor must be used, consider reducing the dose of ibrutinib to 140mg daily and monitor closely for signs of toxicity. Avoid combination

Idelalisib: May increase the serum concentration of CYP3A4 Substrates. Avoid combination

Ifosfamide: CYP3A4 Inhibitors (Moderate) may decrease serum concentrations of the active metabolite(s) of Ifosfamide. Monitor therapy

Imatinib: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Imatinib. Monitor therapy

Ivabradine: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Ivabradine. Avoid combination

Levodopa: Blood Pressure Lowering Agents may enhance the hypotensive effect of Levodopa. Monitor therapy

Lomitapide: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Lomitapide. Avoid combination

Lormetazepam: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Luliconazole: May increase the serum concentration of CYP3A4 Substrates. Monitor therapy

Mitotane: May decrease the serum concentration of CYP3A4 Substrates. Management: Doses of CYP3A4 substrates may need to be adjusted substantially when used in patients being treated with mitotane. Consider therapy modification

Molsidomine: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Naftopidil: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Naloxegol: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Naloxegol. Avoid combination

Netupitant: May increase the serum concentration of CYP3A4 Substrates. Monitor therapy

Nicergoline: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Nicorandil: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Nitroprusside: Blood Pressure Lowering Agents may enhance the hypotensive effect of Nitroprusside. Monitor therapy

Obinutuzumab: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Management: Consider temporarily withholding blood pressure lowering medications beginning 12 hours prior to obinutuzumab infusion and continuing until 1 hour after the end of the infusion. Consider therapy modification

Olaparib: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Olaparib. Management: Avoid use of moderate CYP3A4 inhibitors in patients being treated with olaparib. If such concurrent use cannot be avoided, the dose of olaparib should be reduced to 200 mg twice daily. Avoid combination

Pentoxifylline: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Pimecrolimus: CYP3A4 Inhibitors (Moderate) may decrease the metabolism of Pimecrolimus. Monitor therapy

Pimozide: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Pimozide. Avoid combination

Propafenone: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Propafenone. Monitor therapy

Prostacyclin Analogues: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Quinagolide: May enhance the hypotensive effect of Blood Pressure Lowering Agents. Monitor therapy

Siltuximab: May decrease the serum concentration of CYP3A4 Substrates. Monitor therapy

Simeprevir: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Simeprevir. Avoid combination

St John's Wort: May decrease the serum concentration of CYP3A4 Substrates. Management: Consider an alternative for one of the interacting drugs. Some combinations may be specifically contraindicated. Consult appropriate manufacturer labeling. Consider therapy modification

Tetrahydrocannabinol: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Tetrahydrocannabinol. Monitor therapy

Ticagrelor: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Ticagrelor. Monitor therapy

Tocilizumab: May decrease the serum concentration of CYP3A4 Substrates. Monitor therapy

Tolvaptan: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Tolvaptan. Avoid combination

Trabectedin: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Trabectedin. Avoid combination

Ulipristal: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Ulipristal. Management: This is specific for when ulipristal is being used for signs/symptoms of uterine fibroids (Canadian indication). When ulipristal is used as an emergency contraceptive, patients receiving this combination should be monitored for ulipristal toxicity. Avoid combination

Vilazodone: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Vilazodone. Monitor therapy

Vindesine: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Vindesine. Monitor therapy

Zuclopenthixol: CYP3A4 Inhibitors (Moderate) may increase the serum concentration of Zuclopenthixol. Monitor therapy

Adverse Reactions

>10%:

Cardiovascular: Orthostatic hypotension (6% to 14%)

Endocrine & metabolic: Hypokalemia (10% to 22%)

Local: Injection site reaction (63% to 73%; including erythema at injection site, injection site pain, injection site phlebitis, swelling at injection site)

Miscellaneous: Fever (5% to 11%)

1% to 10%:

Cardiovascular: Hypertension (6% to 8%), hypotension (5% to 8%), peripheral edema (3% to 8%), phlebitis (5%), atrial fibrillation (2% to 5%), ECG abnormality (≤5%)

Central nervous system: Headache (8% to 10%), insomnia (4% to 5%), confusion (≤5%), pain (2%)

Dermatologic: Pruritus (1% to 5%), erythema (3%)

Endocrine & metabolic: Hyponatremia (6% to 8%), increased thirst (3% to 6%), hypomagnesemia (2% to 5%), hyperglycemia (≤3%), hypoglycemia (≤3%), dehydration (2%)

Gastrointestinal: Constipation (6% to 8%), vomiting (5% to 7%), diarrhea (≤7%), nausea (3% to 5%), xerostomia (4%), oral candidiasis (2%)

Genitourinary: Urinary tract infection (4% to 5%), hematuria (2%)

Hematologic & oncologic: Anemia (5% to 6%)

Renal: Polyuria (5% to 6%)

Respiratory: Pneumonia (2% to 5%), pharyngolaryngeal pain (1% to 5%)

<1% (Limited to important or life-threatening): Atrial arrhythmia, sepsis

Warnings/Precautions

Concerns related to adverse effects:

• Hypotension: Discontinue if hypotension occurs; may correct and resume at a reduced dose if necessary.

• Hypovolemia: Discontinue if hypovolemia occurs; may correct and resume at a reduced dose if necessary.

• Injection-site reactions: May occur and may be severe.

• Osmotic demyelination syndrome: May occur with overly rapid correction of hyponatremia (ie, >12 mEq/L per 24 hours), resulting in dysarthria, mutism, dysphagia, lethargy, affective changes, spastic quadriparesis, seizures, coma or death. In susceptible patients, including those with severe malnutrition, alcoholism or advanced hepatic disease, use slower rates of correction.

Disease-related concerns:

• Heart failure: Use in patients with hypervolemic hyponatremia associated with heart failure is limited. Consider alternative treatment options in this population.

• Hepatic impairment: Use caution in patients with moderate (Child-Pugh class B) and severe (Child Pugh class C) hepatic impairment; dosage adjustment required.

• Renal impairment: Not recommended in patients with severe renal impairment (CrCl <30 mL/minute).

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.

Other warnings/precautions:

• Appropriate use: Monitor serum sodium concentrations and neurological status closely during administration. Discontinue use if rate of serum sodium increase is undesirable. If the serum sodium concentration continues to rise, do not resume therapy. May reinitiate infusion (at reduced dose) if hyponatremia persists or recurs (after initial discontinuation for an undesirably rapid rate of rise of serum sodium concentration) in the absence of neurological symptoms.

Monitoring Parameters

Rate of serum sodium increase, vital signs, volume status; neurologic status

Pregnancy Considerations

Adverse events have been observed in animal reproduction studies.

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 headache, increased thirst, constipation, diarrhea, dry mouth, nausea, vomiting, insomnia, or injection site irritation or pain. Have patient report immediately to prescriber signs of fluid and electrolyte problems (mood changes, confusion, muscle pain or weakness, abnormal heartbeat, severe dizziness or passing out, tachycardia, increased thirst, seizures, loss of strength and energy, lack of appetite, urinary retention or change in amount of urine passed, dry mouth, dry eyes, or nausea or vomiting), difficulty swallowing, difficulty speaking, hematuria, painful urination, polyuria, sweating a lot, behavioral changes, fast breathing, tremors, or thrush (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 healthcare 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.

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