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Drug Interactions between sirolimus and temsirolimus

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

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Interactions between your drugs

Major

sirolimus temsirolimus

Applies to: sirolimus and temsirolimus

GENERALLY AVOID: Coadministration with temsirolimus may potentiate the toxicities of sirolimus. Temsirolimus is metabolized primarily to sirolimus in vivo, thus concomitant administration may result in additive adverse effects, including immunosuppression, renal impairment, and pulmonary toxicity.

MANAGEMENT: Concurrent use of temsirolimus and sirolimus should be avoided.

References

  1. (2007) "Product Information. Torisel (temsirolimus)." Wyeth-Ayerst Laboratories

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Drug and food interactions

Moderate

sirolimus food

Applies to: sirolimus

ADJUST DOSING INTERVAL: Consumption of food can decrease the rate and extent of gastrointestinal absorption of sirolimus. Also, the consumption of grapefruit juice may result in increased sirolimus trough concentrations.

MANAGEMENT: Experts recommend that this drug be taken either at least one hour prior to eating or consistently with or without food to avoid variations in sirolimus blood levels. The manufacturer recommends against using grapefruit juice for dilution of sirolimus doses. Patients should be monitored for clinical and laboratory evidence of altered immunosuppressant effects.

References

  1. (2001) "Product Information. Rapamune (sirolimus)." Wyeth-Ayerst Laboratories

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Moderate

temsirolimus food

Applies to: temsirolimus

GENERALLY AVOID: Coadministration of temsirolimus with grapefruit juice may increase the plasma concentrations of sirolimus, a major active metabolite of temsirolimus and known substrate of CYP450 3A4. The proposed mechanism is inhibition of CYP450 3A4-mediated metabolism by certain compounds present in grapefruits.

MANAGEMENT: Patients treated with temsirolimus should preferably avoid the consumption of grapefruit or grapefruit juice.

References

  1. (2007) "Product Information. Torisel (temsirolimus)." Wyeth-Ayerst Laboratories

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Therapeutic duplication warnings

Therapeutic duplication is the use of more than one medicine from the same drug category or therapeutic class to treat the same condition. This can be intentional in cases where drugs with similar actions are used together for demonstrated therapeutic benefit. It can also be unintentional in cases where a patient has been treated by more than one doctor, or had prescriptions filled at more than one pharmacy, and can have potentially adverse consequences.

Duplication

Macrolide immunosuppressants

Therapeutic duplication

The recommended maximum number of medicines in the 'macrolide immunosuppressants' category to be taken concurrently is usually one. Your list includes two medicines belonging to the 'macrolide immunosuppressants' category:

  • sirolimus
  • temsirolimus

Note: In certain circumstances, the benefits of taking this combination of drugs may outweigh any risks. Always consult your healthcare provider before making changes to your medications or dosage.

Duplication

Mtor inhibitors

Therapeutic duplication

The recommended maximum number of medicines in the 'mTOR inhibitors' category to be taken concurrently is usually one. Your list includes two medicines belonging to the 'mTOR inhibitors' category:

  • sirolimus
  • temsirolimus

Note: In certain circumstances, the benefits of taking this combination of drugs may outweigh any risks. Always consult your healthcare provider before making changes to your medications or dosage.

See also

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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.

Medical Disclaimer