First, when did you take them?
If its been over a week, many toxins will be flushed.
But if its anything less than 3 days.....
They will do a COMPLETE panel drug test.
This means they want to know EVERY darn
thing you are putting into your body.
Go see a Doctor ASAP, if you can.
See if he can't give you a script. (You may
need them some time again if you pull
a hamstring) That way you're in the clear.
Its NOT a narcotic but if they find something
in you like the Soma, (Carisoprodol) that
you don't have a prescription for, they WILL ask.
Good luck. 
Check out these sites. They may have more info...
[URL="http://usmilitary.about.com/od/joiningthemilitary/a/mepsglance.htm"]
http://usmilitary.about.com/od/joiningthemilitary/a/mepsglance.htm[/URL]
[URL="http://www.mepcom.army.mil/"]
http://www.mepcom.army.mil/[/URL]
[URL="http://www.military.com"]Benefiting the US Army, US Navy, US Air Force, Marine Corps, Coast Guard - Military.com[/URL]