Canasa^® is a prescription medication.

Indications and Usage
CANASA^® 1000 mg suppositories are indicated for the treatment of active ulcerative proctitis.

You should not use CANASA^® if you are allergic to any of the ingredients or to salicylates (including asprin or mesalamine also found in products such as Asacol^®, Lialda^®, and Rowasa^®).

Tell your doctor if you have or have had kidney problems, pancreatitis (inflamed pancreas), pericarditis (inflamed sac around your heart), or if you are pregnant, or allergic to sulfasalazine, foods, preservatives or dyes. You should not breastfeed while using CANASA^®. You and your doctor will decide if you should use CANASA^®.

As with other products containing mesalamine, less common, but possibly serious side effects include cramps, sharp abdominal (stomach area) pain, bloody diarrhea, and sometimes fever, headache, and rash may occur. In rare cases, patients may experience symptoms such as chest pain or shortness of breath. Stop use and tell your doctor right away if you get any of these symptoms. In rare cases, patients using CANASA^® develop worsening colitis (pancolitis). The most common side effects of CANASA^® reported included: headache, gas or flatulence, and diarrhea.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit http://www.FDA.gov/medwatch, or call 1-800-FDA-1088.

Please see the link for full US Prescribing Information