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Drug interactions between Allegra and Delsym 12 Hour Cough Relief

Results for the following 2 drugs:
Allegra (fexofenadine)
Delsym 12 Hour Cough Relief (dextromethorphan)

Interactions between your drugs

There were no interactions found in our database between Allegra and Delsym 12 Hour Cough Relief - however, this does not necessarily mean no interactions exist. Always consult with your doctor or pharmacist.


A total of 83 drugs (311 brand and generic names) are known to interact with Allegra.

Delsym 12 Hour Cough Relief

A total of 617 drugs (3809 brand and generic names) are known to interact with Delsym 12 Hour Cough Relief.

  • Delsym 12 Hour Cough Relief is a member of the drug class antitussives.
  • Delsym 12 Hour Cough Relief is used to treat Cough.

Drug and food interactions


fexofenadine food

Applies to: Allegra (fexofenadine)

Consuming large amounts of certain fruit juices, including grapefruit, orange and apple, may decrease the levels of fexofenadine in your body. Fexofenadine should be taken with water and refrain from drinking large amounts of grapefruit, orange, or apple juice. This will make it easier for your body to absorb the medication.

Switch to professional interaction data

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.