Tramadol
"Pulled muscles in lower back from lifting on delivery route. Needed meds I could take during the day while driving. One 50mg in the am with 2 Advil liquidgels & I'm pain free all day. Best side effect has been the clarity to mental processes. Like a cloud has been lifted & my concentration dramatically increased. Focus like I've never experienced before & general attitude improvement. Worse side effect is the occasional constipation but that's what prunes are for. This is my "Limitless" pill from the movie"