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Drug Interactions between Singulair and Toviaz

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

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Interactions between your drugs

No interactions were found between Singulair and Toviaz. However, this does not necessarily mean no interactions exist. Always consult your healthcare provider.

Singulair

A total of 107 drugs are known to interact with Singulair.

Toviaz

A total of 305 drugs are known to interact with Toviaz.

Drug and food interactions

Moderate

fesoterodine food

Applies to: Toviaz (fesoterodine)

MONITOR: Coadministration with moderate inhibitors of CYP450 3A4 such as grapefruit juice may increase the plasma concentrations of fesoterodine's active metabolite, 5-hydroxymethyl tolterodine, which is partially metabolized by the isoenzyme. The possibility of prolonged and/or increased pharmacologic effects of fesoterodine should be considered. Because 5-hydroxymethyl tolterodine is also metabolized by CYP450 2D6, the clinical significance of the interaction may be greater in patients who are CYP450 2D6-deficient, or so-called poor metabolizers of CYP450 2D6 (approximately 7% of Caucasians and less than 2% of Asians and individuals of African descent) who may rely more on the 3A4 metabolic pathway for clearance of the drug.

MANAGEMENT: Caution is advised if fesoterodine is administered with grapefruit or grapefruit juice. Patients should be advised to notify their physician if they experience potential adverse effects of fesoterodine such as irregular heartbeat, blurry vision, difficulty urinating, dry mouth, headache, drowsiness, dizziness, gastrointestinal upset, or constipation.

References

  1. "Product Information. Toviaz (fesoterodine)." Pfizer U.S. Pharmaceuticals Group (2008):

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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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