section name header

Table 197-1

Drugs with Interactions in Myasthenia Gravis (MG)

Drugs that may exacerbate MG

Antibiotics

Aminoglycosides: e.g., streptomycin, tobramycin, kanamycin

Quinolones: e.g., ciprofloxacin, levofloxacin, ofloxacin, gatifloxacin

Macrolides: e.g., erythromycin, azithromycin

Nondepolarizing muscle relaxants for surgery

D-Tubocurarine (curare), pancuronium, vecuronium, atracurium

Beta-blocking agents

Propranolol, atenolol, metoprolol

Local anesthetics and related agents

Procaine, Xylocaine in large amounts

Procainamide (for arrhythmias)

Botulinum toxin

Botox exacerbates weakness

Quinine derivatives

Quinine, quinidine, chloroquine, mefloquine (Lariam)

Magnesium

Decreases acetylcholine release

Penicillamine

May cause MG

Checkpoint inhibitors

May cause MG and other autoimmune neuromuscular disorders (e.g., myositis, inflammatory neuropathy)

Drugs with important interactions in MG

Cyclosporine and Tacrolimus

Broad range of drug interactions, which may raise or lower levels

Azathioprine

Avoid allopurinol-combination may result in myelosuppression