Reporting Reactions to Flagyl and Why Alcohol Should Be Avoided

Flagyl and Alcohol Side Effects

It is "common knowledge" among healthcare professionals that alcohol and Flagyl interact in a severe or even dangerous way. Even the prescribing information for Flagyl warns of the possible interaction, stating that consuming alcohol while taking Flagyl (or even within three days of taking Flagyl) may cause the following side effects:
  • Nausea
  • Vomiting
  • Flushing
  • Headache
  • Digestive upset.
However, recent clinical studies have failed to demonstrate a significant interaction between Flagyl and alcohol. Despite the lack of a demonstrated interaction between alcohol and Flagyl, your healthcare provider and pharmacist will probably still warn you to avoid alcohol while taking Flagyl. This is probably a good idea, although it may be for other reasons than the presumed interaction (such as because it is not wise to drink alcohol while recovering from an infection). Most of the supposed effects of the Flagyl/alcohol interaction can be attributed to just the medication itself.

Flagyl Side Effects to Report

There are a number of possible side effects with Flagyl that you should report immediately to your healthcare provider, including, but not limited to:
  • Seizures
  • Numbness or paralysis of an arm, leg, foot, or hand
  • Signs of an allergic reaction, such as:


    • An unexplained rash
    • Hives
    • Itching
    • Unexplained swelling (especially of the lips, mouth, or throat)
    • Wheezing or other breathing problems.


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