I stopped taking Tefidera two days ago because my stomach pain was so severe and I had a fever, chills and nausea. Today I still feel like I have a virus and severe stomach pain even though my doctor put me on Singulair for stomach pain. Is it possible I have a virus together with reactions from the drug?
The constellation of symptoms you describe—fever, chills, nausea and abdominal pain— would be unusual for Tecfidera and suggest a viral gastroenteritis. You should contact your doctor and see him or her. In the meantime, you made the correct choice to stop Tecfidera until your problem is sorted out by your physician.
By the way, I do not think your doctor put you on Singulair for stomach pain. Singulair is used as a treatment for asthma and one of its main side effects is stomach pain.
Hope you feel better soon.