brands for butyl nitrites after the fda put in the prescription requirement again in 1969. butyl nitrites were outlawed in 1988 by the anti-drug abuse act of 1988. this prompted distributors to sell other alkyl nitrites not yet banned, like isopropyl nitrites. in 1990, isopropyl nitrites and other nitrites not yet banned were outlawed by the crime control act of 1990. both of these laws include an exception for commercial purpose, defined as any use other than for the production of consumer products containing volatile alkyl nitrites meant for inhaling or otherwise introducing volatile alkyl nitrites into the human body for euphoric or physical effects.