amyl nitrite
an organic nitrite, administered by nasal inhalation, that dilates (widens) arteries by relaxing smooth muscles in arterial walls. The main effects are to dilate the coronary arteries supplying the heart and to reduce blood pressure. Amyl nitrite has been used therapeutically in the treatment of angina pectoris and as an antidote to cyanide poisoning. It is now best known as a recreational drug that is reputed to enhance orgasm and other aspects of the sexual experience; adverse effects can include anxiety, nausea, dizziness, faintness associated with a drop in blood pressure, and impaired oxygen-carrying capacity of the blood.