LSD (lysergic acid diethylamide) is one of the most commonly used hallucinogens in New Zealand, and is most commonly sold as ‘tabs’, or small squares of blotting paper that have been soaked in liquid LSD. It is less commonly sold in liquid, tablet or capsule form, or in squares of gelatine. Tiny LSD tablets or capsules are often called ‘microdots’ which usually measure only 2-3mm in diameter. LSD in its pure form is colourless, odourless, mildly bitter and usually in the form of white powder.

Mostly taken orally, LSD's effects are highly variable and unpredictable. They begin within one hour and generally last between eight to12 hours. LSD causes distortions in a person's perception of reality. Sensations and feelings can change dramatically and the user may feel several different emotions at once or swing rapidly from one emotion to another.