"I was diagnosed with extreme dry eye, in part due to past Lasix surgery, part occupational hazard, and part age related. My doctor put me on Restasis. It turns out I am allergic. I had none of the eye pain others described. But, my vision was very blurry impeding my ability to read and focus starting day 1. I increased my fluid intake, thinking dehydration. I had a "light " headache, sinus & throat issues getting progressively worse and I would suddenly lose my voice & experience dizziness. My blood pressure was elevated. My face became red & itchy.After feeling abnormalities in the blood flow around my heart, I stopped the Restasis. This all happened in 4 days.  Most of the symptoms left 48 hours after stopping. Restasis is not for everyone."