I wouldn't say so. It really depends on your height, size of the tub, how full it'll be, etc. When I'm thinking of my tub, i have to put my legs up just to be submerged. Plus, there's no real guarantee you slip under and drown. If not, depending on the medication and how soon you slip under after taking it, there's a chance you wake up in the midst of drowning. Not a good method, imo