How much creatine do you drink and niacin To pass drug test?

Dude, put the niacin back on the shelf. You could eat a case of it in one night and still not clean the drugs out of your urine. And if you take too much niacin it can destroy your liver. Worse: any decent drug lab is going to test for adulteration, especially if you're being tested by the court system. "Adulteration" means you tried to screw with the drug test by taking "drug clean" or drinking a lot of water.