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Drug Interactions between rifapentine and treprostinil

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

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Interactions between your drugs

Moderate

rifapentine treprostinil

Applies to: rifapentine and treprostinil

MONITOR: Coadministration with inducers of CYP450 2C8 may decrease the plasma concentrations of treprostinil, which is primarily metabolized by the isoenzyme. Human pharmacokinetic studies with an oral formulation of treprostinil indicate that concomitant administration of the CYP450 2C8 inducer rifampin decreases exposure (both Cmax and AUC) to treprostinil. However, it has not been determined if the safety and efficacy of treprostinil administered subcutaneously or intravenously are altered by this interaction.

MANAGEMENT: Pharmacologic response to treprostinil should be monitored more closely whenever a CYP450 2C8 inducer is added to or withdrawn from therapy, and the treprostinil dosage adjusted as necessary. Patients should be advised to notify their physician if they experience worsening of their condition.

References

  1. (2002) "Product Information. Remodulin (treprostinil)." United Therapeutics Corporation
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  3. Agencia Española de Medicamentos y Productos Sanitarios Healthcare (2008) Centro de información online de medicamentos de la AEMPS - CIMA. https://cima.aemps.es/cima/publico/home.html
  4. Cerner Multum, Inc. (2015) "Canadian Product Information."
View all 4 references

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Drug and food interactions

Moderate

rifapentine food

Applies to: rifapentine

ADJUST DOSING INTERVAL: Administration with food may increase the oral bioavailability of rifapentine and reduce the incidence of gastrointestinal adverse events. Administration with a high fat meal typically increases rifapentine's maximum concentration (Cmax) and systemic exposure (AUC) by approximately 40% to 50% over that observed when rifapentine is administered under fasting conditions. Rifapentine is often prescribed in combination with isoniazid. When single doses of rifapentine (900 mg) and isoniazid (900 mg) were administered with a low fat, high carbohydrate breakfast, the Cmax and AUC of rifapentine increased by 47% and 51%, respectively. On the other hand, isoniazid's Cmax and AUC decreased by 46% and 23%, respectively.

MANAGEMENT: Products containing oral rifapentine as the sole ingredient recommend administration with a meal to increase bioavailability and reduce the occurrence of gastrointestinal upset, nausea, and/or vomiting. Consultation of product labeling for combination products and/or relevant guidelines may be helpful if rifapentine is combined with a medication that is typically taken on an empty stomach.

References

  1. (2021) "Product Information. Isoniazid/Rifapentine 300 mg/300 mg (Macleods) (isoniazid-rifapentine)." Imported (India), 2
  2. (2021) "Product Information. Priftin (rifapentine)." sanofi-aventis

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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.

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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