By Dr Pranab Gyawali, Consultant Gastroenterologist
Many patients in Dubai take 5-ASA medicines — such as Salofalk, Pentasa, or Asacol — for ulcerative colitis but don’t always understand how they work. This video explains how 5-ASAs protect the colon, why they’ve been trusted for over 40 years, and why they are effective in ulcerative colitis but much less useful in Crohn’s disease.
Watch the Video
Q&A: Understanding 5-ASA Medicines
What are 5-ASA medicines?
5-ASA (5-aminosalicylic acid) medicines — including Salofalk, Pentasa, Asacol, and Mesacol — are anti-inflammatory drugs designed to act directly on the inner lining of the colon. They calm inflammation, promote healing, and help prevent flare-ups in ulcerative colitis.
How long have 5-ASAs been in use?
They have been used for over 40 years and remain one of the best-established treatments for ulcerative colitis worldwide. Their long-term safety and effectiveness are reflected in international guidelines such as ECCO and the BSG.
Are 5-ASA medicines useful in Crohn’s disease?
Not usually. In Crohn’s disease, inflammation often spreads deeper into the bowel wall, beyond the surface layer that 5-ASAs reach. Guidelines generally do not recommend 5-ASA for Crohn’s, except possibly in very mild cases limited to the colon or ileum (where Pentasa may have small benefit).
What happens if I stop taking 5-ASA?
Stopping or missing doses can increase the risk of a flare, even if you feel well. 5-ASAs work best when taken consistently — their benefit builds over time, maintaining remission and protecting the colon lining. Compliance prevents flares.
How do I know if 5-ASA is right for me?
These medicines are typically used for mild to moderate ulcerative colitis and are considered first-line in many guidelines. Your gastroenterologist will decide based on location and severity. In Crohn’s disease, especially small bowel involvement, newer targeted therapies are usually more appropriate.