"i began taking phentermine 37.5mg on jan 28 2015.  in addition i am doing a low carb/low calorie diet of 1000-1200 calories a day.  i walk two miles a day and do approximately 1 hour of cardio a day.  my doctor prescribed it for 2 months on and one month off. i am currently two weeks into my &quot;off&quot; month of phen. as of today, april 10 2015, i have lost 40 lbs.  i find it to be an excellent appetite suppressant.   the only side effect i experienced was vivid dreaming the first week.  cigna doesn&#039;t cover the prescription but with the goodrx discount i purchase a months supply at kroger for $11.96.  the doctor co-pay is $25."