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IMPORTANT NOTE: A valid Prescription is required to be mailed or faxed to complete this order. I acknowledge that I will need to be contacted to complete a health profile before my order is shipped.
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  • Express shipping may be available upon request

Buy Pentasa (Mesalamine) Online

Pentasa is affordable and easy to buy with Canada Drug Warehouse. You can order your prescription medications online or call us 7 days a week and get your Pentasa delivered to your door for the fraction of the cost you usually pay.

What is Pentasa?

Pentasa (Mesalamine) is a medication used to treat ulcerative colitis and Crohn disease and to prevent the symptoms from these conditions such as diarrhea, rectal bleeding and stomach pain from returning. Mesalamine works by decreasing swelling within your colon.

Always read the patient information and instructions carefully before using this medication.

  • Pentasa is taken orally and is typically taken four times a day. If you are taking the tablet form this should be taken with food. Pentasa capsules may be taken with or without food.
  • Swallow Pentasa whole. Do not crush, chew or break your medications as this may stop the medication from being properly released into the colon. If you have problems swallowing the capsules whole, you can open the capsules and sprinkle the contents onto yogurt or applesauce and then swallow this mixture immediately without chewing.
  • Your Pentasa dosage is based on your medical condition and response to treatment. Do not change your dosage or the frequency you take this medication unless advised by a doctor.
  • Pentasa is most effective when it is taken regularly. Try to take this medication at the same time each day. Tell your doctor if your condition does not improve or worsens.


Make sure to tell your doctor and pharmacist:

  • If you have any drug allergies.
  • Which other prescription and non-prescription medications you currently take.
  • Your medical history especially of kidney disease, liver disease, stomach blockage or skin problems.
  • If you are breast feeding. This medication may have undesirable effects on a nursing infant.

Also be aware that:

  • This medication should only be taken when clearly needed during pregnancy.
  • Pentasa is similar to aspirin. Children and teenagers should not take this medication if they have chickenpox, flu or any undiagnosed illness or if they have recently received a vaccine.

Mesalamine side effects

Common Pentasa side effects may include but are not limited to:

  • Nausea, stomach pain, diarrhea or constipation.
  • Sore throat, sinus pain, runny or stuffy nose.
  • Fly symptoms.
  • Headache or back pain.
  • Rashes.
  • Abnormal liver function tests.

Contact your doctor if you experience any of the following side effects of mesalamine:

  • Severe stomach pain, cramping or bloody diarrhea.
  • Fever, headache or skin rash.
  • Bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds.
  • Signs of kidney problems such as painful, burning little or no urination, swelling in your feet or ankles, tiredness or shortness of breath.
  • Signs of liver problems such as loss of appetite, upper stomach pain, tiredness, easy bruising or bleeding, dark urine, clay-colored stools or jaundice.
  • Signs of an allergic reaction such as hives, difficulty breathing or a swelling of your face, lips or throat.


Q: What should I do if I miss a dose of Pentasa?

A: If you miss a dose of this medication, take it as soon as you remember. If it is almost time for your next dose, then skip your missed dose.

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Linda C

January 9, 2023

I love Canada Drug Warehouse. They are super efficient and I like that they call me when one of my medications is about to expire. They have saved me thousands of dollars. This is a great company!!!!!!

James D

October 14, 2022

My prescription was received in 14 business days from the date of payment. The meds arrived in individual sealed pill packs. This was my first order and very pleased with their prompt and courteous service.

John H

October 1, 2022

Very informed and efficient agent taking order. Delivery when promised. Outstanding service.

Robert C

September 9, 2022

Meds received in a timely manner.


September 8, 2022

This is an absolutely reliable source of prescription meds and I have saved more than $5,000 in one year by ordering from them. Highly recommend.

Donald K

September 7, 2022

I have only good things to say about Canada Drug Warehouse. Please keep up the good work.

A valid Prescription is required to be mailed or faxed to complete this order. I acknowledge that I will need to be contacted to complete a health profile before my order is shipped.

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Our goal is to bring you the most affordable medication. If you find a lower price advertised by another website or your local pharmacy, we’ll match that price or beat it by 10% of the difference.* Call us at 1-877-204-1506 and a member of our CareTeam will be happy to assist you.

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Some exceptions may apply. To qualify for price matching, competitors must meet our standards for patient safety. Advertised prices must be for medication of the same type, strength, quantity, and form.