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Drug Interactions between Agenerase and midostaurin

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

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Interactions between your drugs

Moderate

amprenavir midostaurin

Applies to: Agenerase (amprenavir) and midostaurin

MONITOR: Coadministration with inhibitors of CYP450 3A4 may increase the plasma concentrations of midostaurin and its active metabolites, which are all substrates of the isoenzyme. The increase in midostaurin concentrations may be particularly pronounced when CYP450 3A4 inhibitors are administered during the first week of midostaurin administration. When a single 50 mg dose of midostaurin was administered to healthy volunteers on day 6 of treatment with the potent CYP450 3A4 inhibitor ketoconazole (400 mg daily for 10 days), midostaurin systemic exposure (AUC) increased by 10.4-fold compared to administration with placebo. The AUC of the two active metabolites, CGP62221 and CGP52421, increased by 3.5- and 1.2-fold, respectively. When multiple doses of midostaurin (100 mg twice daily on days 1 and 2; 50 mg twice daily on days 3 to 28) were coadministered with itraconazole (100 mg twice daily on days 22 to 28 for 13 doses), the plasma concentrations on day 28 (Cmin) of midostaurin, CGP62221 and CGP52421 increased by 2.1-, 1.2- and 1.3-fold, respectively, compared to the corresponding day 21 Cmin concentrations with midostaurin alone. It is not known to what extent midostaurin may interact with weak and moderate CYP450 3A4 inhibitors.

MANAGEMENT: Caution is advised when midostaurin is used with CYP450 3A4 inhibitors. Patients should be closely monitored for increased adverse reactions (e.g., nausea, vomiting, diarrhea, edema, hyperglycemia, hyperuricemia, QT prolongation, neutropenia, lymphopenia, thrombocytopenia, anemia), especially during the first week of consecutive midostaurin administration in patients with advanced systemic mastocytosis and during the first week of midostaurin administration in each cycle of chemotherapy in patients with acute myeloid leukemia.

References

  1. Dutreix C, Munarini F, Lorenzo S, Roesel J, Wang Y "Investigation into CYP3A4-mediated drug-drug interactions on midostaurin in healthy volunteers." Cancer Chemother Pharmacol 72 (2013): 1223-34
  2. "Product Information. Rydapt (midostaurin)." Novartis Pharmaceuticals (2017):

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Drug and food interactions

Major

midostaurin food

Applies to: midostaurin

GENERALLY AVOID: Grapefruit juice may significantly increase the plasma concentrations of midostaurin. The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruit. In general, the effect of grapefruit juice is concentration-, dose- and preparation-dependent, and can vary widely among brands. Certain preparations of grapefruit juice (e.g., high dose, double strength) have sometimes demonstrated potent inhibition of CYP450 3A4, while other preparations (e.g., low dose, single strength) have typically demonstrated moderate inhibition. Ketoconazole, a potent CYP450 3A4 inhibitor, has been shown to increase midostaurin systemic exposure (AUC) by greater than 10-fold in healthy volunteers. Increased exposure to midostaurin may increase the risk of adverse effects such as nausea, vomiting, diarrhea, edema, hyperglycemia, hyperuricemia, QT prolongation, neutropenia, lymphopenia, thrombocytopenia, and anemia.

ADJUST DOSING INTERVAL: Food enhances the oral bioavailability of midostaurin. Relative to fasting conditions, midostaurin systemic exposure (AUC) increased by approximately 1.2-fold when administered with a standard meal (457 calories; 50 g fat, 21 g proteins, 18 g carbohydrates) and 1.6-fold when administered with a high-fat meal (1007 calories; 66 g fat, 32 g proteins, 64 g carbohydrates), while midostaurin peak plasma concentration (Cmax ) decreased by 20% and 27%, respectively.

MANAGEMENT: The manufacturer recommends taking midostaurin with food. Midostaurin was administered with food in clinical trials. Patients should avoid consumption of grapefruit and grapefruit juice during treatment with midostaurin.

References

  1. "Product Information. Rydapt (midostaurin)." Novartis Pharmaceuticals (2017):

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Moderate

amprenavir food

Applies to: Agenerase (amprenavir)

GENERALLY AVOID: Administration with a high-fat meal may decrease the oral bioavailability of amprenavir. The mechanism is unknown. In healthy volunteers, consumption of a standardized high-fat meal decreased the peak plasma concentration (Cmax) and area under the concentration-time curve (AUC) of amprenavir (1200 mg single oral dose) by 36% and 21%, respectively, compared to administration in the fasted state. The time to reach Cmax (Tmax) was increased 44% following a high-fat meal.

Grapefruit juice does not appear to significantly affect the pharmacokinetics of amprenavir. In 12 healthy volunteers, administration with grapefruit juice (200 mL) decreased the mean peak plasma concentration (Cmax) of amprenavir (1200 mg single oral dose) by 22% compared to water. The median time to reach Cmax (Tmax) was prolonged from 0.75 to 1.13 hours. These pharmacokinetic changes are not thought to be clinically significant, since antiretroviral response is more closely associated with systemic exposure (AUC) and trough plasma concentration (Cmin), which were not affected in the study.

MANAGEMENT: Amprenavir may be taken with or without food, but should not be taken with a high-fat meal.

References

  1. "Product Information. Agenerase (amprenavir)." Glaxo Wellcome PROD (2001):
  2. Demarles D, Gillotin C, Bonaventure-Paci S, Vincent I, Fosse S, Taburet AM "Single-dose pharmacokinetics of amprenavir coadministered with grapefruit juice." Antimicrob Agents Chemother 46 (2002): 1589-1590

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Therapeutic duplication warnings

No warnings were found for your selected drugs.

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.

Further information

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