To insert vaginal metronidazole using the applicator: For all dosage forms: Relax while lying on your back with your knees bent (or in any position that you feel comfortable). Can i apply metronidazole gel while on my period? my doc perscribed my metronidazole pills for a week, my bacterial infection didnt go away. now she perscribed my metronidazole gel and two fluconazole tablets. im goin to start my period real soon and dont know if i should wait or go ahead and start applying it?? My periods have been regular almost to the day for over 20 years and while on this medicatin, my period is not almost a week late. I know I'm not pregnant, but I feel for all the girls this has happened to that may be worried; I think this side affect should be added to the list. I'm certain it's this medication that is the cause. Do not drink alcohol while taking a course of metronidazole tablets, liquid, suppositories or vaginal gel, or for 2 days after finishing treatment. Alcohol can cause side effects such as feeling and being sick, stomach pain, hot flushes, a pounding heartbeat (palpitations) and a headache. If you are Metronidazole Side Effects - Healthline 11 Oct 2016 Serious side effects can occur while taking metronidazole tablets or capsules. subjects were given high doses of metronidazole for a long period. Adults and children 12 years and over: take one 200 mg pill every 4 to 6 hours while symptoms persist. If pain or fever does not respond to 1 pill, 2 pills may be used. If pain or fever does not respond to 1 pill, 2 pills may be used. Can i use metronidazole while on my period If you're taking antibiotics for an illness, it may affect your menstrual cycle. Most women experience no change, but a heavy course of antibiotics can delay your period. It is possible to counteract these changes by taking a good quality probiotic to restore the population of good bacteria in your gut. I have been on antibiotics for 8 days my period. What do I need to tell my doctor BEFORE I take Metronidazole Tablets and Capsules? If you have an allergy to metronidazole or any other part of this medicine ( metronidazole tablets and capsules). If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Metronidazole comes as a tablet, an extended-release tablet, and as a capsule to take by mouth. Metronidazole capsules and tablets are usually taken as a one-time dose (or divided into two doses on 1 day) or two to four times daily for up to 10 days or longer.