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Drug Interactions between clarithromycin and delavirdine

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

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Interactions between your drugs

Moderate

clarithromycin delavirdine

Applies to: clarithromycin and delavirdine

ADJUST DOSE: Concomitant administration of delavirdine and clarithromycin has been shown to increase the area under the plasma concentration-time curve (AUC) of clarithromycin by 100%. The mechanism may be related to inhibition of CYP450 3A4 hepatic metabolism.

MANAGEMENT: Close clinical monitoring for toxicity is recommended if this combination is used. The manufacturer recommends dose adjustments for clarithromycin in patients with renal insufficiency: Reduce the dose by 50% for patients with a creatinine clearance of 30 to 60 mL/min, and reduce by 75% for patients with creatinine clearance less than 30 mL/min.

References (1)
  1. (2001) "Product Information. Rescriptor (delavirdine)." Pharmacia and Upjohn

Drug and food interactions

Minor

clarithromycin food

Applies to: clarithromycin

Grapefruit juice may delay the gastrointestinal absorption of clarithromycin but does not appear to affect the overall extent of absorption or inhibit the metabolism of clarithromycin. The mechanism of interaction is unknown but may be related to competition for intestinal CYP450 3A4 and/or absorptive sites. In an open-label, randomized, crossover study consisting of 12 healthy subjects, coadministration with grapefruit juice increased the time to reach peak plasma concentration (Tmax) of both clarithromycin and 14-hydroxyclarithromycin (the active metabolite) by 80% and 104%, respectively, compared to water. Other pharmacokinetic parameters were not significantly altered. This interaction is unlikely to be of clinical significance.

References (1)
  1. Cheng KL, Nafziger AN, Peloquin CA, Amsden GW (1998) "Effect of grapefruit juice on clarithromycin pharmacokinetics." Antimicrob Agents Chemother, 42, p. 927-9

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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