Amyl nitrate is in a small mesh covered ampule that is popped or snapped to release the vapors.
It is sometimes sold in the ampules too. Light headed, dizzy, slowed perception of time. Headache, flushing of the face, decreased in blood pressure, increase pulse, dizziness, relaxation of involuntary muscles especially the blood vessel walls and the anal sphincter. Nausea, vomiting, decreased blood pressure and respiration, fainting, coldness of the skin. Possible circulatory collapse and death.