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Drug Interactions between conivaptan and Marqibo

This report displays the potential drug interactions for the following 2 drugs:

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Major

conivaptan vinCRIStine liposome

Applies to: conivaptan and Marqibo (vincristine liposome)

GENERALLY AVOID: Coadministration with potent inhibitors of CYP450 3A4 and/or P-glycoprotein may significantly increase the plasma concentrations of vinca alkaloids, which are substrates of both the hepatic microsomal isoenzyme and intracellular efflux transporter. Although pharmacokinetic data are not available, the interaction has been associated with severe and life-threatening toxicities in both adult and pediatric cancer patients. Paralytic ileus, intestinal obstruction and perforation, laryngeal nerve paresis requiring mechanical ventilation, neurogenic bladder, paresthesia, paralysis, hypotension, hypertension, heart failure, hyponatremia secondary to SIADH, seizures, profound myelosuppression, and septic shock have been reported. Most cases have involved vincristine or vinblastine in combination with itraconazole. However, the interaction has also been reported with other known potent inhibitors such as clarithromycin, erythromycin, cyclosporine, posaconazole, voriconazole and ritonavir, as well as less potent ones such as nifedipine and isoniazid. In adults with acute lymphoblastic leukemia receiving vincristine as part of their chemotherapeutic regimen, neurotoxicity (paresthesia, muscle weakness, and paralytic ileus) was more severe and occurred earlier and more frequently in 14 patients coadministered itraconazole 400 mg/day for antifungal prophylaxis than in 460 previous patients who did not receive itraconazole (29% vs. 6%). Similarly, in a retrospective cohort study consisting of 25 patients receiving 59 courses of vinorelbine-containing chemotherapy, the incidence of grade 3 or 4 neutropenia was 63.2% in patients who were coadministered clarithromycin, compared to 27.5% in those who did not receive clarithromycin. The incidence of grade 4 neutropenia was also higher in the clarithromycin group, 31.6% vs. 2.5%. Four patients who had received vinorelbine both with and without clarithromycin had lower neutrophil counts during clarithromycin coadministration. A retrospective study to assess vincristine dosing and toxicity in combination with azoles found that vincristine dosing modifications (i.e., dose reductions, dose delays, therapy discontinuation) occurred in 58.6% of patients who received concomitant azole therapy (n=29) compared to 23.8% of patients who did not (n=21). The mean dose reduction of vincristine when combined with an azole was 46.5%. Symptoms of decreased peristalsis were also more common in the azole group, 65.5% vs. 28.6%. The individual incidence was 50%, 75%, and 66.6% in patients receiving fluconazole, voriconazole, and posaconazole, respectively. In addition, patients in the azole group were more likely to have an incomplete course of vincristine, 48.3% vs. 9.5%. Most reported cases of toxicity have been reversible following discontinuation of the CYP450 3A4 inhibitor, and many of the patients tolerated their chemotherapy in the absence of the inhibitor or after dose adjustment. In one incident, however, a patient who had been on itraconazole for fungal pneumonia developed constipation, mucositis, and granulocytopenia within one week after the first dose of vinorelbine and cisplatin, and died 12 days later. No other details were available.

MANAGEMENT: Concomitant use of vinca alkaloids with potent CYP450 3A4 and/or P-glycoprotein inhibitors should be avoided if possible. Some authorities recommend avoiding concomitant use of vinca alkaloids during and for 2 weeks after treatment with itraconazole. Otherwise, conservative dosing of the antineoplastic should be considered, and the patient closely monitored for toxicity. Based on the known half-life of vinca alkaloids (24 to 48 hours), the time course of interaction is expected to be approximately 5 to 7 days. Patients should be advised to seek medical attention if they experience symptoms that could indicate neuro- or myelotoxicity, including constipation, abdominal pain or bloating, urinary retention, paresthesia, paralysis, muscle weakness, hearing loss, seizures, erratic blood pressure changes, unusual or excessive bleeding, easy bruising, pallor, fatigue, dizziness, lightheadedness, fever, chills, and sore throat. Following discontinuation of the potent CYP450 3A4 inhibitor, a washout period of approximately one week should be allowed before the antineoplastic dosage is adjusted upward to the previous dosage.

References

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View all 41 references

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Drug and food interactions

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Therapeutic duplication warnings

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Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

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