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Background  It has not previously been reported that sildenafil citrate causes malignant arrhythmias in humans.    Case presentation  A 41-year-old man developed sustained ventricular tachycardia following sildenafil citrate administration.    Conclusion  It cannot be dismissed that this patient experienced ventricular tachycardia as an adverse effect of sildenafil citrate administration.

Ventricular tachycardia after administration of sildenafil citrate: a case report