Short answer: Both ibuprofen (Advil) and aspirin can irritate the stomach lining because they’re NSAIDs that reduce protective prostaglandins in the gut. But aspirin tends to cause more stomach irritation and higher risk of ulcers and bleeding, in part because it irreversibly inhibits COX enzymes and also affects platelets.
Key differences
- Mechanism and duration of effect:
- Aspirin: Irreversibly inhibits COX-1 and COX-2. The effect on platelets lasts for the life of the platelet (about 7–10 days), which contributes to a higher bleeding risk.
- Ibuprofen (Advil): Reversibly inhibits COX-1 and COX-2. Its effects wear off as the drug is cleared, so platelet function isn’t impaired long-term.
- Impact on the stomach lining:
- Both reduce protective gastric prostaglandins (which normally help make mucus and bicarbonate and maintain blood flow to the stomach lining).
- Aspirin tends to be more irritating to the stomach and more strongly associated with gastritis, ulcers, and GI bleeding, especially with long-term use or higher doses, older age, prior ulcers, or concurrent risk factors.
- Ibuprofen also can irritate the stomach and cause ulcers/bleeding, but the overall GI risk is usually lower than with aspirin at usual OTC doses. The risk rises with higher doses, long duration, age, or other risk factors.
- Other considerations:
- Low-dose aspirin (often used for heart protection) still carries GI bleeding risk, partly due to its platelet-inhibiting effects.
- Ibuprofen’s GI risk can be reduced somewhat by taking it with food, using the lowest effective dose, or using protective strategies if you need long-term NSAID therapy (e.g., proton pump inhibitors or misoprostol under medical supervision).
- If someone needs GI protection or has a history of ulcers, a clinician might choose a different approach (or add a protective agent) and consider alternatives like acetaminophen for pain, depending on the situation.
Practical tips
- If you have a history of ulcers or GI bleeding, talk to a clinician before using either drug long-term.
- Take NSAIDs with food and avoid alcohol to reduce irritation.
- If you're at higher risk or require long-term use, a healthcare provider might recommend a protective strategy or a different medication.
If you want, tell me your typical dose, duration, and any GI history, and I can tailor the information a bit more.