Does anyone know if withdraws can cause you to be late with your period. I was given too much medicine after my surgery and now I am going through withdraws, which is hell, but now I am 2 weeks late and I am not pregant, I know this because my boyfriend is fixed. And how long does it take to go through something like this. I am 43 and have never done drugs, don't smoke and drink very seldom. So I am about to put my hair out. Please if anyone has any answers I would greatly appreciate them!!