Safely Buy Canasa ( Mesalamine ) from Canada Prescriptions Plus.


Canasa is a brand-name prescription medication containing mesalamine or 5-aminosalicylic acid.

Canasa is used as a rectal suppository to treat adults with active ulcerative proctitis (ulcerative rectal colitis), a type of inflammatory bowel disease that affects the rectum.

Canasa works by reducing inflammation in the lining of the rectum.

Use and Dosage

Read the Patient Information Leaflet provided by your pharmacist before you start using mesalamine each time you get a refill. If you have any questions, consult your doctor or pharmacist.

Use this medication rectally. If you are using the 1000-milligram strength, insert rectally, usually once daily at bedtime. If you are using a lower strength, then your doctor may direct you to use this medication 1 to 3 times daily. Follow your doctor’s directions carefully. Dosage is based on your medical condition, response to therapy, and the strength of your prescription.

Drink plenty of fluids during treatment with this medication unless otherwise directed by your doctor. This will help prevent kidney stones.

This medication works best if you have a bowel movement before using it. Wash your hands before and after using the medication. Unwrap the suppository right before using it. Try to handle it as little as possible because heat from your fingers may cause it to melt. Lie down on your left side with your right knee bent. Gently insert the suppository, pointed end first, into the rectum with your finger. Use a small amount of lubricating gel on the tip of the suppository if desired. Remain lying down for a few minutes. Try to avoid having a bowel movement for 1 to 3 hours, keeping the suppository in place so the medicine can work.

This medication may stain surfaces that it touches (such as clothing, floor, and counter surfaces).

Use this medication regularly to get the most benefit from it. To help you remember, use it at the same time(s) each day.

Tell your doctor if your condition lasts or gets worse.

Side Effects

Common side effects may include:

  • Dizziness
  • Tiredness
  • Headache
  • Rectal pain
  • Fever
  • Rash
  • Vomiting
  • Gas

Serious problems in extremely rare cases include:

  • Cramping
  • Pain in the stomach
  • Bloody stool/diarrhea
  • Chest pain
  • Urine retention
  • Shortness of breath
  • Yellowing of the skin or eyes
  • Severe headache


Before using mesalamine, tell your doctor or pharmacist if you are allergic to it; or to other aminosalicylates (such as balsalazide, olsalazine); or salicylates (such as aspirin, salsalate); or sulfasalazine; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney problems, liver disease, pancreas problems (pancreatitis), and inflammation of the sac around the heart (pericarditis).

This medication may make you more sensitive to the sun, especially if you have skin problems (such as atopic dermatitis, or eczema). Limit your time in the sun. Avoid tanning booths and sunlamps. Use sunscreen and wear protective clothing when outdoors. Tell your doctor right away if you get sunburned or have skin blisters/redness.

This medication is similar to aspirin. Children and teenagers younger than 18 years should not take aspirin or aspirin-related medications (such as salicylates) if they have chickenpox, flu, or any undiagnosed illness, or if they have just been given a live virus vaccine (such as varicella vaccine), without first consulting a doctor about Reye’s syndrome, a rare but serious illness.

During pregnancy, this medication should be used only when needed. Discuss the risks and benefits with your doctor.

This medication passes into breast milk and may have undesirable effects on a nursing infant. Discuss the risks and benefits with your doctor before breastfeeding.

Consult your pharmacist or physician.

Form and Strengths

Canasa is available in the following form and strengths:

Canasa Rectal Suppository:

  • 500 mg
  • 1000 mg


Who should not use Canasa?

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.

What happens if I miss a dose?

If you miss a dose of Canasa, insert it as soon as you remember. If it is almost time for your next dose, skip the missed dose. Insert the next dose at your regular time. Do not insert 2 doses at the same time.

What should I avoid while using Canasa?

Canasa can stain surfaces including clothing and other fabrics, flooring, painted surfaces, marble, granite, vinyl, and enamel. Keep Canasa away from these surfaces to prevent staining.

If you have atopic dermatitis or eczema, you may become more sensitive to the sun while using Canasa. Avoid sun exposure, wear protective clothing, and use broad-spectrum sunscreen when outdoors.



Additional information

Brand Name:


Scientific Name:


Other Names:

Salofalk Suppositories


500mg, 1000mg

Quantities Available:

30, 90


Rectal Suppository