I have been taking Phentermine 37.5mg once a day for 3 weeks. I suffered a series of uncomfortable side effects the first 10 days which included: higher than normal blood pressure, dizziness, feeling lightheaded, nausea, extreme lethargy, palpitations, sever dry mouth, constipation, headaches, zero appetite and lower abdominal discomfort. In the 3rd week the majority of those symptoms disappeared; however I am still suffering from dry mouth, feeling as if my throat is closing which I correlate directly to the dry mouth, the lower abdominal pain, headaches, severe constipation and now I m experiencing new symptoms: my urine has been consistently dark amber in color with an ammonia/semi-sweet aroma. I ve always been one to drink a lot of water and I consume about a gallon a day; however, my urine is still the amber color with the unusual aroma. Is this a normal side effect or should I be concerted?