Colchicine is widely used in the treatment of gouty arthritis, and chronic use of colchicine can cause vacuolar myopathy. We report colchicine-induced myopathy with electrophysiological myotonia in a patient with gouty arthritis. A 86-year-old man with gouty arthritis presented with progressive proximal weakness and gait disturbance. Electrophysiological finding showed myotonic myopathy and muscle biopsy revealed a vacuolar myopathy. His symptoms soon resolved with the discontinuation of colchicine.
