What's the difference between ibuprofen and acetaminophen?
Last updated September 3, 2026.
Ibuprofen is an anti-inflammatory: it blocks pain, fever, AND inflammation at the site, making it the pick for sprains, period cramps, toothache, and arthritis. Acetaminophen works mainly in the brain on pain and fever without touching inflammation - the pick for headaches and general aches, and the safer one with ulcers, kidney problems, blood thinners, or pregnancy. The risks mirror the mechanisms: ibuprofen threatens the stomach lining and kidneys; acetaminophen threatens the liver in overdose. Ibuprofen goes with food, capped at 1,200 mg a day over the counter; acetaminophen caps at 4,000 mg from all sources. Because they work differently, adults can combine or stagger them for stubborn pain. Pymander is a free AI doctor, 24/7 by text, and can help you pick.
What to do
- Inflammation involved? Ibuprofen: sprains, cramps, toothache, swollen joints.
- Sensitive stomach or pregnant? Acetaminophen: the stomach-safe default.
- Never stack ibuprofen with other NSAIDs: naproxen and aspirin count.
- Combining is allowed: different mechanisms, one shared job.
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