I have noticed that when I come down with a cold and start taking medication I really feel horrible. I have that feeling as long as I take the medication. When I finally get to the point that I am tired of feeling that way I stop the meds and suddenly I loose that dopey feeling and feel good again. I have a strong suspicion that it was the withdrawing the medication that caused me to feel better. I would not recommend giving up prescription drugs just to feel better. Some of them can have disastrous impacts if not tapered off. Check with your doctor or pharmacist first.