Autoantibody degradation, dysfunction, and blockade of acetylcholine receptor at the NMJ
Thymus is abnormal in 75% of patients
Thymectomy resolves or improves symptoms in most patients, especially those with a thymoma
No sensory, reflex, pupillary, or cerebellar deficits
Thymectomy resolves or improves symptoms in most patients, especially those with a thymoma
Antimicrobials (Aminoglycosides, clindamycin, erythromycin, tetracycline, doxycycline, azithromycin, fluoroquinolones, vancomycin, chloroquine, hydroxychloroquine, )
Cardiovascular drugs (beta blockers, procainamide, quinidine)
Neuro/psych meds (chlorpromazine, lithium, prochlorperazine, phenytoin, risperidone,
Other (Botox, quinines, magnesium)
Local anesthetics
Antibiotics (Tetracycline/doxycycline, macrolides, metronidazole, nitrofurantoin)
Anticonvulsants (carbamazepine, ethosuximide, gabapentin, phenobarbital, phenytoin)
Butyrophenones (haloperidol)
Phenothiazines (chlorpromazine/prochlorperazine)
Calcium channel blockers
Steroids
Ophthalmic drugs (betaxolol/timolol/proparacaine)
Other (Iodinated contrast agent)
See also: https://neurology.uams.edu/wp-content/uploads/sites/49/2018/03/Drugs-that-may-worsen-Myasthenia-Gravis.pdf
Myasthenia gravis
Antibiotics 
Polymyositis
Steroids
Lambert-Eaton myasthenic syndrome
Anticonvulsants 
Tick paralysis
Psychotropics 