can anyone confer with me, how long do you need to use a backup method for after penicillin?!
I'm only guessing 7 days, as it is 7 days after anything else that disrupts the pill cycle, ie. missing one or two.
I agree with shy girl, go to www.webmd.com and look up the bcp you're on and it will tell you what you should avoid. After you get a perscription for medications the pharmacist will most likely talk to you about interactions.
penicillin is the only one you really have to be careful with. use a backup method during and for at least 7 days after.
for the best answer talk to your pharmacist.