My PCP, pdoc, and four different pharmacists have advised me that they're unable to write or fill a prescription for Ambien for more than 30 (or 31) 10 mg tablets per month because it's a controlled substance. I've heard of people taking 20 mg a night and have always wondered how they get it; in other words, are my docs and pharmacist lying to me? Regardless, I'm a little relieved that they won't let me get more for three reasons: (1) I believe it's psychologically (if not physically) addictive, (2) I would use more than is recommended if it were possible, and (3) women are advised not to take more than 0.5 mg p.m. because they supposedly can't metabolize more.