Any medication may produce side effects as you build blood serum levels and tolerance. There is a wide enough selection of pharmaceuticals for most common conditions that significant long-term side effects should not have to be endured.
In dealing with health care, just as with any other service, remember that you are the boss. If your doctor isn't listening to you--about side effects or anything else--fire him and get another.
Now, for the real story on side effects, read
this piece by authority Dr. Steve Martin.
R.