Chemical names are amyl nitrite, butyl nitrite. 'Poppers' are chemicals that come in liquid form, usually in small bottles. The vapour from the bottle is inhaled through the nose.
'Poppers' cause a 'rush' which lasts for about five minutes. The blood pressure falls and the heart pumps faster. Users report an increase in sexual arousal and a greater sense of enjoyment of music and dancing.
These drugs can make a person feel sick and dizzy, and sometimes cause blackouts.
'Poppers' are especially dangerous for people with heart or breathing problems. The liquid can be poisonous if swallowed.
Slang names include Vitamin K, Special K, Kit-Kat.
Ketamine is a powerful tranquilliser and anaesthetic used in veterinary medicine. It is usually taken as a tablet or snorted as a powder. It causes hallucinations, aggressive behaviour, blackouts and temporary blindness.
Chemical names are sodium oxybate or gammahydroxybutyrate.
Slang names include GBH, 'Liquid Ecstasy'.
Despite the slang name of 'liquid ecstasy', GHB is a totally different chemical to ecstasy with different effects. It is an anaesthetic drug that can very quickly make someone unconscious.