Acid tabs Sheets of blotting paper cut into squares or tabs and impregnated with LSD Lysergic Acid Diethylamide also known as acid Different brands of LSD are identified by the illustration on each tab LSD is a psychedelic drug it changes the level of consciousness and a hallucinogen It is commonly used for recreational purposes despite being illegal in most countries Colourless odourless and easily synthesized it is nonaddictive and nontoxic but its effects are unpredictable The drug was first synthesized by a German chemist Albert Hofmann in It was banned in the US in and in the UK in