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Drug Interactions between abametapir topical and tazemetostat

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

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Interactions between your drugs

Moderate

tazemetostat abametapir topical

Applies to: tazemetostat and abametapir topical

GENERALLY AVOID: Based on in vitro inhibition data, a single topical application of abametapir lotion may increase plasma concentrations of drugs that are substrates of CYP450 3A4, CYP450 2B6, and CYP450 1A2 isoenzymes and increase their systemic concentrations. The proposed mechanism is high and prolonged systemic exposure to the metabolite abametapir carboxyl, which has been shown to be an in vitro inhibitor of CYP450 3A4, CYP450 2B6, and CYP450 1A2. The mean half-life of abametapir carboxyl in adults is estimated to be 71 hours or longer.

MANAGEMENT: Use of CYP450 3A4, CYP450 2B6, and CYP450 1A2 substrates should generally be avoided within 2 weeks after topical application of abametapir lotion. If this is not feasible, the manufacturer recommends avoiding use of abametapir lotion. If abametapir is used, monitor for increased toxicity of the CYP450 3A4, CYP450 2B6, and/or CYP450 1A2 substrate.

References

  1. (2020) "Product Information. Xeglyze (abametapir topical)." Dr. Reddy's Laboratories Inc

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Drug and food interactions

Major

tazemetostat food

Applies to: tazemetostat

GENERALLY AVOID: Consumption of grapefruit or grapefruit juice during tazemetostat therapy may significantly increase the plasma concentrations of tazemetostat. The proposed mechanism is inhibition of the CYP450 3A4-mediated metabolism of tazemetostat by certain compounds in grapefruit. Because grapefruit juice inhibits primarily intestinal rather than hepatic CYP450 3A4, the magnitude of interaction is greatest for those drugs that undergo significant presystemic metabolism by CYP450 3A4 (i.e., drugs with low oral bioavailability). According to the product labeling, coadministration of tazemetostat (400 mg twice daily) with the moderate CYP450 3A4 inhibitor fluconazole increased the tazemetostat steady state exposure (AUC 0 to 8 hours) by 3.1-fold and peak plasma concentration by 2.3-fold. 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. Pharmacokinetic interactions involving grapefruit juice are also subject to a high degree of interpatient variability, thus the extent to which a given patient may be affected is difficult to predict. Clinically, this interaction may result in an increased risk of the frequency or severity of adverse reactions due to tazemetostat such as hemorrhage, pleural effusion, skin infection, dyspnea, pain, and respiratory distress.

MANAGEMENT: The manufacturer advises that patients treated with tazemetostat should avoid consumption of grapefruit or grapefruit juice.

References

  1. (2020) "Product Information. Tazverik (tazemetostat)." Epizyme, Inc

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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

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.