How Long Does It Take A Prescription Medication Levels In Your Body?

I don't fully understand the question. How long does it take a prescription medication levels in your body TO DO WHAT?  

If you are taking prescription meds and have to take a drug test, then you should tell them that you have been taking it as your doctor has prescribed. That is, I am assuming your job is testing and this could be an issue to be fired over.

If you are asking because the doctor wants to see how much of the medication is in your blood, then, different meds build up in the body and stay in the body different amounts of time and effect different people in different ways. That may be why they are testing.

The third thing that comes to mind is that you are either taking a prescription from someone else or that was prescribed for you some time ago and should no longer be taking it. Sometimes the choices we make come with consicuences and if this be the case, I say good luck to you!

If you are talking about them testing for the level of the drug being maintained at a certain level in your blood for the drug to be effective for your ailment or illness..they have to test for a average over time for your lack of activity or your for your average activity level.....easiest explanation is the more active you are the dosage has to be  increased or decreased for the best overall effect..i don't know if this is what you we're meaning but i hope this helps...