A man who took 35 Viagra tablets ended up in hospital with a five-day erection.
Daniel Medforth from Withernsea in East Yorkshire, England described hallucinating and said his whole vision was in green after taking the pills.
He said: "I ended up feeling sick, dizzy and hallucinating, everything I saw was green.
"I had a massive erection that would not go away."
Mr Medforth was hospitalised and later discharged, but he was forced to have bed rest to get over the problem.
He told The Sun newspaper: "It wasn't a permanent erection but every time I brushed against something for five days it sprang into life and it was no use to me."