Actually your body tends to adapt to the phentermine, and some can loose the benefits from Phen. When I was on it I would go 2 weeks on, the take a 3-5 day cleansing period where my body flushed out the build up, and started new with the same "new" side effects as the 1st day. Does this make any sense at all?
lol Basically, take a break form time to time so you don't loose the effect. Thats my experience anyways
Kati