I'm 292lbs and I started taking Phentermine on Friday 01/30/2015 and after 3 days the only issue i have is constipation. I lost 2 pounds so far but i don't know how because i have been constipated and I have the urge to go frequently but nothing (mostly just gas). I also have Nexplanon (birth control implanted in my arm) unsure if that is a contributing factor to the constipation. please advise I have tried everything and i want this to work. Also both of my insurances DON'T cover Phentermine anyone have any suggestions? I'm also thinking of getting Xenical (appetite suppressant)