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Doctors' Answers to "Frequently Asked Questions" - Metronidazole
Metronidazole Vaginal Gel
Answer: It might depend on why you are taking the drug. Use for vaginal infections would be optimized while you are not having your period since the drug will achieve a higher level when it is not being mechanically flushed. However, it will still work and should be effective. Effectiveness in other parts of the body would not be effected.
Answer: Metronidazole has potential interactions with alcohol due to a structural similarity with antabuse. Propanolol has an alcohol side group and occasionally is recognized by the body as such(in the treatment of Familial Tremor for example). However, I have never seen an interaction with propanolol.