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Drug Interactions between abacavir / lamivudine and Paraflex

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

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Interactions between your drugs

Minor

chlorzoxazone abacavir

Applies to: Paraflex (chlorzoxazone) and abacavir / lamivudine

Administration of abacavir with other agents known to use the glucuronyl transferase or alcohol dehydrogenase metabolic pathways may increase the area under the time concentration curve for both drugs. The clinical significance is unknown.

References

  1. "Product Information. Ziagen (abacavir)." Glaxo Wellcome PROD (2001):

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Drug and food interactions

Moderate

chlorzoxazone food

Applies to: Paraflex (chlorzoxazone)

GENERALLY AVOID: Alcohol may potentiate some of the pharmacologic effects of CNS-active agents such as chlorzoxazone. Use in combination may result in additive central nervous system depression and/or impairment of judgment, thinking, and psychomotor skills. In addition, in one small study, watercress was reported to increase chlorzoxazone peak concentrations, AUC, and half-life. The proposed mechanism is inhibition of CYP450 2E1 metabolism. The clinical significance is unknown.

MANAGEMENT: Patients receiving chlorzoxazone should be advised to avoid or limit consumption of alcohol. Ambulatory patients should be counseled to avoid hazardous activities requiring complete mental alertness and motor coordination until they know how chlorzoxazone affects them, and to notify their physician if they experience excessive or prolonged CNS effects that interfere with their normal activities. Watercress should be avoided if an interaction is suspected; e.g., excess sedation, nausea, or headache occurs.

References

  1. Leclercq I, Desager JP, Horsmans Y "Inhibition of chlorzoxazone metabolism, a clinical probe for CYP2E1, by a single ingestion of watercress." Clin Pharmacol Ther 64 (1998): 144-9

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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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