A patient developed progressive and symmetrical muscular tightness in association with frequent intramuscular injections of pentazocine (Talwin). Deltoid contractures in abduction were most prominent, but the myopathic process was wide-spread, though worse in the muscles most frequently injected.
Steiner JC, Winkelman AC, de Jesus PV. Pentazocine-Induced Myopathy. Arch Neurol. 1973;28(6):408–409. doi:10.1001/archneur.1973.00490240068012
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