METROGEL-VAGINAL is a gelled, purified water solution, containing metronidazole at a concentration of 7.5 mg/g (0.75%). The gel is formulated at pH 4.0. From what I've read in the last couple of hours there is no proof of a significant interaction between Metronidazole and alcohol. That said it's better safe than sorry. Epidemiology Incidence 9% of alcoholics with clinically manifest polyneuropathy Female Male Related factors Alcohol abuse Severe: 100 grams of alcohol per day I had 1/2 beer on metronidazole, only took one 500 mg pill in the morning at like 10 am and then had half a beer at 9 pm and the only thing I noticed is I got really hot and sweat more than usual. METRONIDAZOLE 500 MG TABLETS. HOW MANY DO I TAKE A DAY, AND IN WHAT TIME SPAN? - Answered by a verified Health Professional Flagyl (metronidazole) is an antibiotic prescribed to treat various parasitic and bacterial infections (Giardia, C. diff, H. pylori). Common side effects are headaches, nausea, and metallic taste in the mouth. Pregnancy and breastfeeding safety information are provided. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Abbott on metronidazole 500 mg and alcohol: Alcohol in moderation has no effect on this or any other antibiotic. But don't overdo it; heavy alcohol use can impair the body's ability to fight infections. C 10 H 20 N 2 S 4 M.W. 296.54. Disulfiram occurs as a white to off-white, odorless, and almost tasteless powder, soluble in water to the extent of about 20 mg in 100 mL, and in alcohol to the extent of about 3.8 g in 100 mL. Uses. Protozoal infections: extra-intestinal amebiasis (including amoebic liver abscess), intestinal amoebiasis (amoebic dysentery), trichomoniasis, balantidiasis. I've been prescribed Metronidazole and instructed to take 500 mg pills three times daily for 10 days. I'm currently on day four of taking this antibiotic.