Before taking olsalazine, tell your doctor or pharmacist if you are allergic to it; or to aspirin or related drugs (salicylates such as mesalamine, NSAIDs such as ibuprofen, balsalazide, 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: asthma, growths in the nose (nasal polyps), kidney problems, liver problems, radiation treatment in the pelvic area.

This medicine may cause stomach bleeding. Daily use of alcohol may increase your risk for stomach bleeding, especially when combined with this medicine. Check with your doctor or pharmacist for more information.

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.

This medication may make you more sensitive to the sun. 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.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

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

This drug may pass into breast milk and could have undesirable effects on a nursing infant. Consult your doctor before breastfeeding.