<s>[INST] I was prescribed 3 generic diflucan pills to take one a week for a yeast infection.  I am 3 days late and on birth control.  My husband and I had intercourse 3 times during the week I should have been ovulating and we forgot to use a back up method.  Does generic diflucan affect the effectiveness of my birth control? [/INST] Hello, and I hope I can help you today. The interaction between certain medications and the birth control pill are really theoretical except for a few medications that treat seizures and a couple of very strong antibiotics.  Rifleman is not one of those medications, so you do not have to worry about the effectiveness of your birth control method.  So even if you didn't use a backup method it is extremely unlikely you would conceive, as long as you didn't miss any pills. I would recommend doing a urine pregnancy test just in case as your period is late (the pill normally is 99.5 percent effective which means 1 in 200 women a year will get pregnant even when using birth control). But the greatest likelihood is that everything is fine and you and your husband do not need to be concerned. I hope I was able to answer your question today and that my advice was reassuring. Best wishes,  </s>