Severe verapamil (sustained-release) overdose.

Vasodilators, specifically calcium-channel modulators, are currently in widespread use for the treatment of essential hypertension. Several reports of toxicity from immediate-release verapamil have appeared in the literature. We present a case of sustained-release verapamil overdose as a consequence of an attempted suicide. The treatment measures used in a verapamil toxicity are discussed, as well as a review of the current literature on verapamil overdose.