Whenever you engage in any diet pill regimen, you should have as many facts about the drug as you can. This includes with your body chemistry and any other drugs you may be taking. This is important for herbal remedies as well. Any chemical whether it is a phytochemical or a pharmaceutical can have interactions with each other and with other drugs.
Any time we diet and use diet pills we have to take note of the drug interactions with drugs that we normally take everyday. Antidepressants and Phentermine are a good example of what we mean. It is a bad mix simply because diet pills are made to do certain things in the body and so are the antidepressants.