Synthetic hallucinogen; a muscle-relaxant and vasodilator drug believed to be an aphrodisiac or sex enhancer by those who inhale it to prolong and intensify the experience of orgasm. By relaxing the smooth muscles of the vascular system it causes a momentary rush due, primarily, to oxygen depravation to the brain; it also inhibits ejaculation thus prolonging intercourse and orgasm, and relaxes the vaginal and anal sphincters. Often sold in small, breakable, gas-filled ampoules, the effects last from 30 seconds to 5 minutes. Although this drug is currently controlled in the U.S.A., the designer variants: butyl nitrite, isobutyl nitrite, and cyclohexyl nitrite, are still available in some States.