I've been taking Phentermine for a little over 3 weeks now, and my total weight loss is 11lbs. I started off at 183 and as of today, I'm at 172 I was expecting a little better results due to the reviews I've read, but I'm happy that they're working! I've experienced many side effects, energy, loss of appetite, headaches, difficulty breathing, dizziness, dry mouth, mood changes and rapid heartbeat. After a while they've all seemed to go away. Except the difficulty breathing (which I've always had, phentermine just intensifies it), headaches and mood changes. I started walking everyday, and slowly just ended up doing nothing work out wise, and just watching what I eat, and my portions. I'm planning on starting to get back in the gym. Hoping it'll help my results more!