There are many product and chemical names which together form this group. Tranquillisers are man-made drugs, originally developed to treat anxiety, depression and sleeplessness. They are the most commonly prescribed mood-altering drug in the UK. Classes Temazepam: Class C drug. Only legal to possess if prescribed. Other tranquillisers are legal to possess, but supply is against the law and Class C penalties apply Known As: Tranqs. The most popular one is Temazepam, also known as Temazzies, Tems, Eggs, Bombs, Golf balls, Jellies, Sleepers. Looks Like: They come in tablet or capsule form. Apparent Positive Effects: Calms people down and slows them down mentally Relieves tension and anxiety The Downside: High doses can make people drowsy and forgetful They are extremely dangerous if mixed with alcohol. Consequences can be fatal. Tolerance develops quickly, so it is easy to become dependent Withdrawal symptoms can be very unpleasant, and include headaches, sickness, anxiety, and even convulsions.