You may be heavier because you are drinking more water. Does the phentermine make you thirsty? But more to the point, why are you taking phentermine? Is it an FDA approved drug for weight loss? Please ask your doctor whether it is . Or go on line and check the FDA web site on weight loss products to make sure that it is approved. Phentermine is a stimulant and as such may have some side effects like the possibility of elevated blood pressure. Also once you stop taking phentermine, your weight may come back very quickly. This is what happens with this drug and sometimes people even gain more weight than they lost.
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