I experienced a severe, exceedingly painful scleritis after my first dose of Fosamax. The ophthalmologist treated it as as "allergy" with prentisone drops. I was prevented from taking a second dose and the eye cleared up but recurred in full force after resumption of the medication. I accidentally noticed "Rarely, eye involvement" in the brochure that comes with the drug. But who associates Fosamax with the eye? My doctor didn't believe it until I was able to find several medical reports of such instances. The reports emphasized that the affliction did not clear up until the medication was stopped. I have not taken it again and have had no further trouble. I suppose I should try it once more,but no thanks! It hurt too much!