Phentermine
"I started this medication 12 days ago.  The first week I lost 5 pounds, next weigh in is in 2 days.  The first day I had a mild headache but I now avoid that by avoiding caffeine.  I do have dry mouth a lot so I keep water nearby at all times.  I haven't had any kind of appetite so I have to force myself to eat. I highly recommend this medication!"