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Drug Interactions between dutasteride / tamsulosin and nevirapine

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

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Interactions between your drugs

Moderate

nevirapine tamsulosin

Applies to: nevirapine and dutasteride / tamsulosin

MONITOR: Coadministration with nevirapine may decrease the plasma concentrations and therapeutic efficacy of drugs that are substrates of CYP450 3A4. The proposed mechanism is increased clearance due to nevirapine-mediated induction of CYP450 3A4.

MANAGEMENT: Caution is advised if nevirapine is used concomitantly with drugs that are CYP450 3A4 substrates. Dosage adjustments as well as clinical and laboratory monitoring of coadministered drugs should be considered whenever nevirapine is added to or withdrawn from therapy.

References (4)
  1. (2001) "Product Information. Viramune (nevirapine)." Boehringer-Ingelheim
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  3. Cerner Multum, Inc. "Australian Product Information."
  4. (2017) "Product Information. Viramune XR (nevirapine)." Boehringer Ingelheim
Moderate

nevirapine dutasteride

Applies to: nevirapine and dutasteride / tamsulosin

MONITOR: Coadministration with nevirapine may decrease the plasma concentrations and therapeutic efficacy of drugs that are substrates of CYP450 3A4. The proposed mechanism is increased clearance due to nevirapine-mediated induction of CYP450 3A4.

MANAGEMENT: Caution is advised if nevirapine is used concomitantly with drugs that are CYP450 3A4 substrates. Dosage adjustments as well as clinical and laboratory monitoring of coadministered drugs should be considered whenever nevirapine is added to or withdrawn from therapy.

References (4)
  1. (2001) "Product Information. Viramune (nevirapine)." Boehringer-Ingelheim
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  3. Cerner Multum, Inc. "Australian Product Information."
  4. (2017) "Product Information. Viramune XR (nevirapine)." Boehringer Ingelheim

Drug and food interactions

Moderate

tamsulosin food

Applies to: dutasteride / tamsulosin

ADJUST DOSING INTERVAL: Food may delay the gastrointestinal absorption of tamsulosin. The time to maximum plasma concentration (Tmax) is reached by 4 to 5 hours under fasted conditions and by 6 to 7 hours when tamsulosin is administered with food. The delay in Tmax has the desirable effect of smoothing the tamsulosin plasma concentration profile, thereby reducing fluctuation of the plasma peak and trough concentrations with multiple dosing. Food may also affect the extent of absorption of tamsulosin. It has been reported that taking tamsulosin under fasted conditions results in a 30% increase in bioavailability (AUC) and 40% to 70% increase in peak plasma concentration (Cmax) compared to fed conditions. The effects of food on the pharmacokinetics of tamsulosin are consistent regardless of whether tamsulosin is taken with a light meal or a high-fat meal.

MANAGEMENT: To ensure uniformity of absorption, tamsulosin should be administered approximately one-half hour following the same meal each day.

References (1)
  1. (2001) "Product Information. Flomax (tamsulosin)." Boehringer-Ingelheim

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.

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.

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