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Drug Interactions between Heartburn Relief and vismodegib

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

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Interactions between your drugs

Minor

famotidine vismodegib

Applies to: Heartburn Relief (famotidine) and vismodegib

The solubility of vismodegib is known to be pH-dependent (0.1 mcg/mL at pH 7 and 0.99 mg/mL at pH 1) and drugs that alter the pH of the upper gastrointestinal tract may affects its solubility and reduce its bioavailability. However, a clinically significant pharmacokinetic effect has not been observed, with results from a clinical study showing a 33% reduction in the unbound drug concentrations of vismodegib after 7 days of concomitant therapy with the proton pump inhibitor rabeprazole (20 mg, given 2 hours before each vismodegib administration).

References (3)
  1. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  2. Cerner Multum, Inc. "Australian Product Information."
  3. (2012) "Product Information. Erivedge (vismodegib)." Genentech

Drug and food interactions

Minor

famotidine food

Applies to: Heartburn Relief (famotidine)

H2 antagonists may reduce the clearance of nicotine. Cimetidine, 600 mg given twice a day for two days, reduced clearance of an intravenous nicotine dose by 30%. Ranitidine, 300 mg given twice a day for two days, reduced clearance by 10%. The clinical significance of this interaction is not known. Patients should be monitored for increased nicotine effects when using the patches or gum for smoking cessation and dosage adjustments should be made as appropriate.

References (1)
  1. Bendayan R, Sullivan JT, Shaw C, Frecker RC, Sellers EM (1990) "Effect of cimetidine and ranitidine on the hepatic and renal elimination of nicotine in humans." Eur J Clin Pharmacol, 38, p. 165-9

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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