Phentermine causes hair thinning?

See below: Although you won't see hair loss (alopecia) as a listed side effect for most anorectic medications, it is a commonly reported event. The hair loss usually starts around the third month, and can continue for as long as you are losing weight. Alopecia can be caused by the change and diet and hormonal levels that accompanies weight loss. Centrally acting obesity medications also have hormonal effect.