Mesalazine Asacol Medications

Mesalazine Info

What Is Mesalazine?

Mesalazine (also called mesalamine) belongs to the group of 5-aminosalicylic acid (5-ASA) agents. It is an anti-inflammatory medication that works mainly in the lining of the gut. The ingredient is found in several products, the most common brand in Hong Kong being Asacol.

Medications That Contain Mesalazine

In Hong Kong the name Asacol is widely recognised for mesalazine tablets. Asacol is supplied in different strengths, typically 400 mg and 800 mg, and is taken orally. Generic mesalazine tablets are also available from local pharmacies and may be marketed under the International Non-proprietary Name (INN) “mesalazine”. Both the brand and generic forms come as coated tablets designed to release the drug in the intestine, where it can act locally.

What Does Mesalazine Treat?

• Ulcerative colitis - a long-term inflammation of the colon that leads to abdominal pain, diarrhoea and blood in the stool. Mesalazine reduces the swelling of the colon lining, helping symptoms improve and flare-ups become less frequent.
• Mild to moderate Crohn’s disease affecting the colon - although not approved for all forms of Crohn’s, some clinicians use mesalazine to ease inflammation when the disease is limited to the large intestine.
• Maintenance of remission - after an acute flare has settled, continuing mesalazine can help keep the bowel calm and lower the chance of another flare.
• Proctitis - inflammation limited to the rectum. A lower dose of mesalazine can be used in tablet form or as a suppository (different product) to treat this localized irritation.

These uses are based on the drug’s ability to block chemicals that trigger inflammation in the gut lining. It is generally prescribed for adults and adolescents, but the exact suitability depends on individual health circumstances.

How Mesalazine Works

Mesalazine is released in the intestine, where it stays mostly on the surface of the bowel wall. There it interferes with the production of inflammatory messengers, such as prostaglandins and leukotrienes. By quieting this response, the medication lessens swelling, pain and bleeding. Effects are often noticed within a few days, but full benefit may take several weeks of regular use.

Safety Information

Common Side Effects

• Mild stomach discomfort or nausea
• Headache
• Loose stools or temporary increase in bowel movements
• Minor skin rash

These reactions are usually short-lived and resolve without needing to stop the medication.

Serious Reactions

• Severe allergic signs such as swelling of the face, lips or throat, or difficulty breathing
• Persistent high fever, severe abdominal pain or bloody stools that worsen suddenly

If any of these occur, urgent medical attention is required.

Who Should Be Cautious

• People with a known allergy to salicylates (including aspirin) should avoid mesalazine.
• Individuals with severe kidney disease may need special monitoring because the drug is partly eliminated by the kidneys.
• Pregnant or breastfeeding persons should discuss the benefits and risks with their healthcare provider, as safety data are limited.

Interaction Awareness

• Other anti-inflammatory drugs (e.g., non-steroidal anti-inflammatory drugs) can increase the risk of kidney problems.
• Anticoagulants like warfarin may have their effect altered; regular blood-test monitoring is advised.
• Alcohol in large amounts can irritate the stomach and should be limited.

For a full list of possible interactions, refer to the product-specific information that accompanies each medication.

Key Points to Remember

• Store tablets in a cool, dry place away from direct sunlight.
• Treatment duration varies: short courses are used for active flare-ups, while lower doses may be continued for long-term maintenance.
• Always read the label that comes with your specific product and follow the instructions it provides.
• Different brands or strengths may have slightly different dosing schedules; the details are listed on each pack.

Glossary

5-ASA: Short for 5-aminosalicylic acid, the class of drugs that includes mesalazine.

Ulcerative colitis: A chronic condition causing inflammation and ulceration of the colon’s inner lining.

Remission: A period when disease symptoms are minimal or absent.

Proctitis: Inflammation confined to the rectum.

Salicylate allergy: An allergic reaction to substances related to aspirin.

Information Disclaimer

This article offers general educational information about mesalazine as an active substance used in various medicines. Its purpose is to help patients better understand the ingredient and the conditions it is used to treat. It is not a substitute for professional medical advice or for the specific instructions provided with individual products. Medicines containing mesalazine may differ in formulation, strength, and directions for use. Always consult the labeling of your particular medication and follow your healthcare provider’s guidance for complete information on proper use, dosage, and safety.