answer:Feonfibrate: Drugs.com You should check with your doctor immediately if any of these side effects occur when taking fenofibrate: Chills or fever hives or skin rash itching muscle aches and pains nausea or vomiting. Lipitor:Drugs.com Stop taking Lipitor and call your doctor at once if you have any of these serious side effects: unexplained muscle pain, tenderness, or weakness; Less serious side effects: Mild muscle pain. **************** I would not take another pill of either med. until you check with your physician. It could be an allergic reaction. As we get older, we are more and more likely to have allergic reactions to medication, typically after 48 hours.