How much sulfur is in Plavix? My mother, 78 years old, was put on plavix after having 3 stents put in more than 1 year ago. She took plavix for one year. During that time she had stomach cramping, confusion, off balance, light headed. She is allergic to sulfur. She stopped taking plavix and her symptoms went away. 6 months later she is having angina attacks and is set up for a dye test among others. Her doctor wants her to take plavix again until they decide what to do. Her sulfur allergy isn't going to just go away. I don't think the benifits of the plavix outweigh the sulfur allergy.