18.1. It is prohibited to let the boxer use any drugs or chemical substances, which are not part of the boxer’s usual diet.

18.2. It is possible to use substance for local anaesthesia, but only with the ring doctor’s approval.

18.3. The prohibited substances for boxers are categorised in accordance with the WADA list of banned substances.

18.4. A boxer who uses a prohibited substance, or the person who gives the boxer a prohibited substance, must be penalised by the WMC Executive Board.

18.5. A boxer or an official who violates regulations of drugs or prohibited substances must be penalised and prohibited from any bout or participation in any muaythai activities for a period of time decided by the WMC Executive Board.

18.6. Any boxer who refuses to have a medical check-up following a bout will be prohibited from any bout. Any official who encourages the boxer to commit such offense will be prohibited from competitions.