Dromadol SR - I was given this med for back pain, 50mg every 8 hours as needed. Tramadol does nothing for my pain? I had been taking Darvocet (Propoxy-N/APAP 100-650 Tab every 12 hours as needed. It worked wonders, but the FDA took it off the market after 60 years. Anyone know why the tramadol is not working on me