Erectile dysfunction drugs (Cialis, Levitra, Viagra) cause amnesia.

  First it was vision loss...then hearing loss...now memory loss. All three drugs in this class...Cialis, Levitra, and Viagra...will list transient global amnesia on their labels.

  Transient global amnesia is a sudden, temporary loss of memory that usually lasts around 6 hours. People can't recall events that occurred during the episode that their memory was impaired.

  One theory is that erectile dysfunction drugs change levels of nitric oxide and other brain messengers responsible for neuronal cell to cell communication.