I have been taking pherntetine 37.5mg early in the morning for 2 weeks. does it work even if you are slightly underweight i t helps with cravings

No Long-Term Help: Phentermine was first approved in 1959 and has never been shown to cause permanent weight loss or change in cravings. Cravings/weight come back when pill is stopped. The best way to stop cravings is to eliminate all processed foods 100% for a period of 1-2 months. Cravings are part of an addiction/withdrawal reaction. Exposure to small amounts of addictive substances keeps addictions alive.