Methicillin

**Definition:** One of the PENICILLINS which is resistant to PENICILLINASE but susceptible to a penicillin-binding protein. It is inactivated by gastric acid so administered by injection.

**Tree numbers:** - D02.065.589.099.750.500 - D02.886.108.750.500 - D03.633.100.300.750.500

**Synonyms:** - Penicillin, Dimethoxyphenyl - Meticillin