An erectile dysfunction drug left men with 'intensely blue' vision and red-green blindness

A hospital in Turkey has treated 17 men in two years who took sildenafil, the active...

A man went blind after contracting a parasite from showering with his contacts in

Nick Humphreys, a 29-year-old man from the UK, contracted Acanthamoeba keratitis, which...

A man who overdosed on erectile dysfunction medicine now has red-tinted vision — and doctors say it's 'irreversible'

Colour tints are known to be possible effects of sildenafil - also known as Viagra.