I just started pm and was prescribed 7.5 lortabs 3 to 4 times per day. I have 2 left and I also have one 5 mg lortab left over. My appt is next in a few days. I'm trying to go without so that I will be able to take it closer to time so it will show up in drug screen. If I take the 5 mg lortab the morning of will that be enough to show up in drug screen? Also is flexeril on a drug screen?