"i started phentermine 37.5mg in march 2011 and weighed in at 180. by the end of april i was down 20lbs to 160. it gave me energy and really suppressed my hunger, but i had horrible dry mouth, constipation, irritability, and had to force myself to eat. since i stopped, i have gained 10 lbs back in 7 months and is entirely my fault. i have started it back up again because to me the side effects are worth the outcome. it loses it&#039;s potency after a couple of months, but still suppresses the hunger more than without it. as long as i am dedicated to the program, i should be able to take off the 10lbs i gained and then some within 2 months time. my realistic goal weight is 145 and is totally doable with healthy habits."