For mildly to moderately
active ulcerative proctitis…

CANASA® delivers relief

Prescription CANASA may be able to help in the treatment of mildly to moderately active ulcerative proctitis. Find out more about mildly to moderately active ulcerative proctitis and its treatment with CANASA on this website. Start here.


*Offer not valid for patients enrolled in Medicare, Medicaid, or other federal or state healthcare programs. Please see Program Terms, Conditions, and Eligibility Criteria here.



Do not use CANASA if you are:

  • allergic to medicines that contain salicylates, including aspirin.
  • allergic to mesalamine or any of the ingredients in CANASA. See Patient Information in the full Prescribing Information for a complete list of ingredients in CANASA.
Ask your doctor if you are not sure if your medicine is listed.

Before using CANASA, tell your doctor if you:

  • have a history of allergic reaction to the medicine sulfasalazine (Azulfidine).
  • have kidney problems.
  • have ever had inflammation of the sac around your heart (pericarditis).
  • have liver problems.
  • have any other medical conditions.
  • are pregnant or plan to become pregnant. It is not known if CANASA can harm your unborn baby.
  • are breastfeeding or plan to breastfeed. CANASA can pass into your breast milk. Talk to your doctor about the best way to feed your baby if you use CANASA.
Tell your doctor about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements. Taking CANASA with nonsteroidal anti-inflammatory drugs (NSAIDs) may cause kidney problems. Taking CANASA with azathioprine or 6-mercaptopurine may cause blood problems. Your doctor may do certain tests during treatment with CANASA.

What are the possible side effects of CANASA?

CANASA may cause serious side effects, including:

  • Kidney Problems. Your doctor will do certain tests before you start using CANASA and during your treatment.
  • Acute Intolerance Syndrome or Other Allergic Reactions. When this happens, it is usually in people who have had an allergic reaction to sulfasalazine. Stop using CANASA and tell your doctor right away if you get any of these symptoms: cramps, stomach (abdominal) pain, bloody diarrhea, chest pain, decrease in the amount of urine, fever, headache, rash, shortness of breath, or fatigue.
  • Liver Problems. This can happen in people who have a history of liver problems and have taken other medicines that contain mesalamine. Tell your doctor right away if you get any of these symptoms while using CANASA: yellowing of your eyes, itchy skin, feeling very tired, flu-like symptoms, nausea or vomiting.
The most common side effects of CANASA include: dizziness, acne, inflammation of the large intestine (colitis), rectal pain, fever, and rash.

Tell your doctor if you have any side effect that bothers you or does not go away. These are not all of the possible side effects of CANASA.

What is CANASA?

CANASA (mesalamine) 1000 mg rectal suppository is a prescription medicine used to treat adults with active ulcerative proctitis (ulcerative rectal colitis). It is not known if CANASA is safe and effective in children.

Please also see the Patient Information within the full Prescribing Information.

Allergan® and its design are trademarks of Allergan, Inc.

CANASA® is a registered trademark of Aptalis Pharma Canada ULC, an Allergan affiliate.

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The product information provided in this site is intended only for residents of the United States. The products discussed on this site may have different product labeling outside of the United States.

The health information described in this site is provided for educational purposes only and is not intended to substitute for discussions with a healthcare provider.