What side effects may I notice from receiving Mesalamine?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-blood in the urine
-bloody diarrhea
-breathing problems
-chest pain
-pain in the lower back or side
-pain when urinating
-rash, fever, swollen lymph nodes
-signs and symptoms of infection like fever; chills; cough; sore throat; pain or trouble passing urine
-signs and symptoms of liver injury like dark yellow or brown urine; general ill feeling or flu-like symptoms; light-colored stools; loss of appetite; nausea; right upper belly pain; unusually weak or tired; yellowing of the eyes or skin
-trouble passing urine or change in the amount of urine
-unusual bleeding or bruising
-unusual or severe stomach upset or pain
-unusually weak or tired
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-gas
-headache
-mild hair loss
-nausea, vomiting
-stomach pain

This list may not describe all possible side effects for Mesalamine. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.