A carbamate, reversible cholinesterase inhibitor, is occasionally used as pre-treatment, before contact with toxic compounds. In the case of certain intoxications, it may increase the efficacy of aetiological treatments initiated. This compound is pyridostigmine bromide, 30 mg orally administered every 8 hours. Maximum protection is only achieved after repeat administration (3 administrations), thus excluding its use in emergency situations. It should not, under any circumstances, be considered as a treatment for the intoxication.