It made me crazy! The meds don't interact well with everyone's body chemistry. Like the pp stated, it's basically speed and it leaves you wired. For me, it made my temper almost unmanageable. It basically kills your appetite while you are on it, but after a while it starts to rev back up. Also, once you get off the meds, I've known people to say your appetite become heartier than before. Phen doesn't work on emotional eaters. I eat even when I'm not hungry so for me I didn't see much weight loss.