In clinical practice, it is found that many drugs can cause aggravation of MG symptoms, or even worsen and cause critical symptoms. Such drugs are: 1. Antibiotics: streptomycin, kanamycin, gentamicin, neomycin, tetracycline, jessamine, haloperidol, ciprofloxacin, ampicillin, tobramycin, polymyxin B and polymyxin E, etc. And the antibiotics that have not been found to aggravate MG so far are: penicillin, chloramphenicol, erythromycin, dactinomycin, spiramycin, vancomycin, cephalosporin antibiotics (such as vanguardycin, etc.). 2, cardiovascular drugs: lidocaine, quinidine, procainamide, insulin, insulin, Medocin, aminocin, isoproterenol, methicillin, slow pulse, etc. 3, anti-epileptic drugs: phenytoin sodium, ethosuximide, trimethoprim, etc. 4, antipsychotic drugs: lithium carbonate, luminal, phenelzine, chlorpromazine, clonidine, Valium (especially injections). 5, anesthetics: morphine, dulcolax, chloroform, arrow poison, ether. If anesthesia is necessary for surgery, halothane, nitrous oxide, cyclopropane, succinylcholine, etc. can be used. 6, other drugs: penicillamine, chloroquine, quinine, choline chloride and carnitine, etc.