People react to drugs differently. Drug reactions don't always happen the first time you take them. Sometimes it takes the body a while to recognize it, and in some cases decides that it is an enemy. When I was younger, I had penicillin for a couple of infections, not close together, and never had a problem until one day when it was perscribed again, I had a reaction.

If you are noticing a pattern, then its something you should call your Dr. about. Even if you are in the process of changing Dr.s. Don't just stop cold turkey, (some drugs cause withdrawl), but call. The Dr. may want to take you off that medication and or put you on another. Its not worth taking a chance.

Sam2