Phentermine (the generic for Adipex) tends to give me some strange side effects. I get random spots on my arms or head where it is fuzzy feeling and I get a patch of goose bumps. I do not have as much of cotton-mouth as I do with Adipex. Both phentermine and adipex have been wonderful! With not only the pill, but proper diet and exercise, I have lost as much as even 11 lbs. in a week. I love the extra boost!