Viagra® (Sildenafil) temporarily improves hemianopia after posterior infarction

A 65 year old male had suffered from a bilateral ischemic stroke of the posterior cerebral arteries (PCA) probably due to a cardiac embolisation resulting also in the occlusion of the proximal left vertebral artery in 2002. After partial recovery, he had persisting hemianopia to the right and less to the left with some day-to-day fluctuations. In 2004 he experienced improvement of the heminaopia, every time he took 25mg sildenafil. This effect started approximately 10 minutes after oral administration, had its maximum effect after 60–90 minutes and lasted for at least 4–7 days. Since then he took 50–100mg silden…