Pentasa (Mesalamine)

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Pentasa Brand
Dosage Quantity & Price
Mesalamine (Generic alternate to Pentasa) Generic

We don't sell this generic-version medication.

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Table of contents:

Pentasa is a medication used to treat certain bowel diseases, specifically mild to moderate ulcerative colitis in adults. It contains mesalamine, which is an anti-inflammatory agent that helps to reduce symptoms such as diarrhea and inflammation, ulcers, and sores in the bowel.

To alleviate the main symptom of ulcerative colitis, inflammation of the colon, this aminosalicylate obstructs the activity of both cyclooxygenase and lipoxygenase; this, in turn, reduces the production of prostaglandin, the compound responsible for colon inflammation. It may be used alone or in combination with other medications, and treatment may vary depending on the severity of the condition and other individual factors.

Uses and Dosage

Pentasa comes in the form of Prolonged Release Tablet to take by mouth as directed by your doctor, usually 4 times daily.  Swallow the tablet whole; do not crush, chew, or break it as this can prevent the drug from being released properly into the colon. In case of difficulty swallowing the Tablets, the contents can be opened and sprinkled on applesauce or yogurt, but the drug/food mixture should be swallowed whole without chewing, and not prepared in advance.

Drink plenty of fluids during treatment with Pentasa, unless otherwise directed by your doctor, to help prevent kidney stones. Your dosage is determined by your medical condition and response to treatment. Use Pentasa regularly to get the most benefit from it and take it at the same time each day to help remember. If your condition does not improve or worsens, inform your doctor.

Side Effects

Common Side Effects of Pentasa (Mesalamine):

  • Constipation
  • Diarrhea
  • Dizziness
  • Gas
  • Headache
  • Nausea
  • Stomach cramps
  • Tiredness
  • Vomiting

Serious Side Effects of Pentasa (Mesalamine):

  • Blood in the urine
  • Bloody diarrhea
  • Change in urine output
  • Chest pain
  • Dark urine
  • Fever
  • Increased abdominal cramping
  • Persistent vomiting
  • Shortness of breath
  • Yellowish skin

Form and Strength

Pentasa (Mesalamine) is available in the following forms and strength:

Pentasa: Prolonged Release Tablet

  • 500 mg


  • Patients should inform their healthcare provider if they are scheduled to have any medical procedures, such as colonoscopy, as Pentasa may affect the results of certain tests.
  • Patients with a history of heart problems or who are taking medications that affect the heart should also use Pentasa with caution, as the medication may cause heart-related side effects.
  • Patients with a history of liver disease or abnormal liver function tests should use Pentasa with caution, as the medication may cause liver damage.
  • Pentasa may cause an allergic reaction in some patients, including symptoms such as difficulty breathing, hives, and swelling of the face or throat. Patients should seek emergency medical attention immediately if they experience any signs of an allergic reaction.
  • Pentasa may cause serious kidney problems or worsen existing kidney disease. Patients with kidney problems should carefully discuss the risks and benefits of using Pentasa with their healthcare provider.
  • Pentasa may increase the risk of developing a rare, but serious, condition called acute intolerance syndrome. Symptoms of this condition may include cramping, vomiting, fever, and bloody diarrhea. Patients should contact their healthcare provider immediately if they experience any of these symptoms while taking Pentasa.
  • Pentasa may interact with other medications, including blood thinners and azathioprine, and can increase the risk of side effects. Patients should inform their healthcare provider of all medications they are taking before starting Pentasa.
  • Pentasa may not be suitable for all patients, including those with a history of allergic reactions to mesalamine or any other ingredients in Pentasa. Patients with liver problems or who are pregnant, or breastfeeding should also ask their healthcare provider before using Pentasa.
  • Pentasa should be taken with caution in patients with a history of pancreatitis, as the medication may worsen this condition.
  • Some common side effects of Pentasa may include headache, nausea, abdominal pain, and joint pain. Patients should inform their healthcare provider of any persistent or troublesome side effects.

Frequently Asked Questions (FAQ)

Can Pentasa interact with other medications?

Pentasa may interact with other medications, including blood thinners and azathioprine, and can increase the risk of side effects. Patients should inform their healthcare provider of all medications they are taking before starting Pentasa.

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

If you miss a dose of Pentasa, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for the missed dose.

Can Pentasa be taken with food or on an empty stomach?

Pentasa can be taken with or without food, but it is important to take the medication consistently in the same way each time.

Can Pentasa cause hair loss?

Hair loss is not a common side effect of Pentasa, but in rare cases, it may occur. Patients should inform their healthcare provider if they experience any hair loss while taking the medication.

Is Pentasa safe for children?

Pentasa has not been tested extensively in pediatric patients, and its safety and effectiveness in children have not been established. Children should only take Pentasa under the close supervision of a healthcare provider.

Can Pentasa be taken long-term?

Pentasa can be taken long-term as directed by a healthcare provider. However, patients should be monitored regularly for any potential side effects or changes in their condition.


It's important to purchase Pentasa from verified Canadian pharmacy.

Additional information

Generic name:



Slow Release Tablet



Quantities Available:

100, 200


Online Pharmacies Canada has provided information from third parties intended to increase awareness and does not contain all the information about Pentasa (Mesalamine). Talk to your doctor or other qualified medical practitioners for medical attention or advice, or if you have any concerns about Pentasa (Mesalamine).