if you want to pass a drug test go to albertsons or wallgreens or someplace like that and buy some niacindont take more than 500 mg at once or you're stomach will hurt.anyways,take 300 to 500 mg every 3 hours and make sure to drink alot of fluids.you will get red and feel pretty hot but it won't hurt you.do that for 3 days or so and you should be fine.:thumbsup: