We report the case of a 55-year-old man who had a parkinsonian syndrom
e unresponsive to levodopa for 5 years and had been taking verapamil d
uring the past 8 years. Parkinsonian signs improved markedly after wit
hdrawal of verapamil, suggesting its role in unmasking the parkinsonis
m. To our knowledge, this side effect of verapamil has not been descri
bed previously.