most helpful answer metronidazole (flagyl) does not affect your period. however if you are taking a birth control pill the antibiotic can affect how well the pill works -- meaning if you didn't use another form of birth control it would increase the likelihood of getting pregnant. home pregnancy tests are sensitive enough to detect pregnancy if you're one week late if that's a possibility. just be sure to get a test that says it can detect pregnancy when you're one week late. i looked up the side effects and there is no mention of this side effect. here is the link that i found: <link> i would call my doctor and take a pregnancy test to be sure.
can using metronidazole gel close to my period affect when my period arrives? i am one week late. i used metronidazole vaginal gel the week my period was supposed to start. i have look online for answers but now i am worried since it has been a little over a week late to start. can this obstruct when my perod arrives?