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Drug Interactions between Dutrebis and Tegretol

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

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Interactions between your drugs

Minor

carBAMazepine raltegravir

Applies to: Tegretol (carbamazepine) and Dutrebis (lamivudine / raltegravir)

Coadministration with inducers of uridine diphosphate glucuronosyltransferase (UGT) 1A1 may reduce the plasma concentrations of raltegravir, which is primarily metabolized by UGT1A1-mediated glucuronidation. In 9 study subjects, administration of a single 400 mg dose of raltegravir in combination with the potent UGT1A1 inducer rifampin (600 mg daily) resulted in a 38% decrease in raltegravir peak plasma concentration (Cmax), a 40% decrease in systemic exposure (AUC), and a 61% decrease in trough plasma concentration (Cmin) compared to administration of raltegravir alone. The impact of other potent inducers of drug-metabolizing enzymes such as carbamazepine, phenytoin, and phenobarbital on UGT1A1 is unknown. Other, less potent inducers (e.g., efavirenz, nevirapine, etravirine, rifabutin, dexamethasone, St. John's Wort, pioglitazone) may be used with the recommended dosage of raltegravir.

References

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  2. Canadian Pharmacists Association (2006) e-CPS. http://www.pharmacists.ca/function/Subscriptions/ecps.cfm?link=eCPS_quikLink
  3. (2007) "Product Information. Isentress (raltegravir)." Merck & Co., Inc
  4. Cerner Multum, Inc. "Australian Product Information."
View all 4 references

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Drug and food interactions

Moderate

carBAMazepine food

Applies to: Tegretol (carbamazepine)

GENERALLY AVOID: Alcohol may potentiate some of the pharmacologic effects of carbamazepine. Use in combination may result in additive central nervous system depression and/or impairment of judgment, thinking, and psychomotor skills.

In a small, randomized, crossover study, the administration of carbamazepine with grapefruit juice (compared to water) increased plasma drug concentrations by approximately 40%. The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruits.

MANAGEMENT: Patients receiving carbamazepine should be advised to avoid or limit consumption of alcohol. Given the drug's narrow therapeutic index, patients receiving carbamazepine therapy should preferably avoid the regular consumption of grapefruits and grapefruit juice to prevent any undue fluctuations in plasma drug levels. Patients should be advised to report signs of carbamazepine toxicity (nausea, visual disturbances, dizziness, or ataxia) to their physicians.

References

  1. (2002) "Product Information. Tegretol (carbamazepine)." Novartis Pharmaceuticals
  2. Garg SK, Kumar N, Bhargava VK, Prabhakar SK (1998) "Effect of grapefruit juice on carbamazepine bioavailability in patients with epilepsy." Clin Pharmacol Ther, 64, p. 286-8
  3. Bailey DG, Dresser GR, Kreeft JH, Munoz C, Freeman DJ, Bend JR (2000) "Grapefruit-felodipine interaction: Effect of unprocessed fruit and probable active ingredients." Clin Pharmacol Ther, 68, p. 468-77

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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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