The worst side effect you've never heard of

http://www.msnbc.msn.com/id/42501090/ns/health-health_care/

Veronica Zenkner, 20, from DeKalb, Ill., still suffers from the damage caused by Stevens-Johnson Syndrome, a rare but sometimes deadly drug reaction. Zenker is blind in her left eye and remains painfully sensitive to almost all light, requiring her to wear sunglasses every day.