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Drug interactions between Flomax and Toviaz

Results for the following 2 drugs:
Flomax (tamsulosin)
Toviaz (fesoterodine)

Interactions between your drugs

There were no interactions found in our database between Flomax and Toviaz - however, this does not necessarily mean no interactions exist. Always consult with your doctor or pharmacist.


A total of 508 drugs (3113 brand and generic names) are known to interact with Flomax.


A total of 603 drugs (3780 brand and generic names) are known to interact with Toviaz.

Drug and food interactions


tamsulosin food

Applies to: Flomax (tamsulosin)

Food may affect the intestinal absorption of tamsulosin. You should take tamsulosin approximately one-half hour following the same meal each day to ensure steady absorption and blood levels of the drug.

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fesoterodine food

Applies to: Toviaz (fesoterodine)

Grapefruit juice may increase the levels of fesoterodine in your body. Let your doctor know if you experience excessive drowsiness, dizziness, irregular heartbeat, blurry vision, difficulty urinating, dry mouth, headache, gastrointestinal upset, or constipation while taking fesoterodine. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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Therapeutic duplication warnings

No therapeutic duplications were found for your selected drugs.

Drug Interaction Classification

The classifications below are a guideline only. The relevance of a particular drug interaction to a specific patient is difficult to determine using this tool alone given the large number of variables that may apply.
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 information available.

Do not stop taking any medications without consulting your healthcare provider.

Further information

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