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Drug Interaction Report

3 potential interactions and/or warnings found for the following 2 drugs:

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Interactions between your drugs

Moderate

naproxen lansoprazole

Applies to: Prevacid NapraPAC 500 (lansoprazole / naproxen), Prevacid NapraPAC 500 (lansoprazole / naproxen)

GENERALLY AVOID: Theoretically, proton pump inhibitors may decrease the gastrointestinal absorption of enteric-coated naproxen, which requires an acidic environment for dissolution. The proposed mechanism is an increase in gastric pH (i.e. decreased gastric acidity) induced by proton pump inhibitors. In patients treated with proton pump inhibitors, the possibility of a reduced or subtherapeutic response to enteric-coated naproxen should be considered.

MANAGEMENT: Concomitant use of these drugs is generally not recommended.

References

  1. (2002) "Product Information. Naprosyn (naproxen)." Syntex Laboratories Inc

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Minor

lansoprazole vismodegib

Applies to: Prevacid NapraPAC 500 (lansoprazole / naproxen), 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

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

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Drug and food interactions

Moderate

naproxen food

Applies to: Prevacid NapraPAC 500 (lansoprazole / naproxen)

GENERALLY AVOID: The concurrent use of aspirin or nonsteroidal anti-inflammatory drugs (NSAIDs) and ethanol may lead to gastrointestinal (GI) blood loss. The mechanism may be due to a combined local effect as well as inhibition of prostaglandins leading to decreased integrity of the GI lining.

MANAGEMENT: Patients should be counseled on this potential interaction and advised to refrain from alcohol consumption while taking aspirin or NSAIDs.

References

  1. (2002) "Product Information. Motrin (ibuprofen)." Pharmacia and Upjohn

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Therapeutic duplication warnings

No duplication 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.

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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.

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Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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