You can usually take 400 mg of ibuprofen every 4–6 hours as needed, but you should not exceed 1,200 mg per day without specific instructions from a healthcare professional, and you should only use it regularly for a short time unless a doctor is supervising you.

Quick Scoop

Typical adult schedule (12+ years)

  • 400 mg per dose.
  • Every 4–6 hours as needed for pain or fever.
  • Do not go over 3–4 doses of 400 mg in 24 hours (that’s 1,200–1,600 mg, depending on local guidelines and whether it’s over‑the‑counter or prescription).
  • For over‑the‑counter use, many health sources and package labels cap this at 1,200 mg per day unless a doctor says otherwise.

Short-term only

  • For fever: usually no more than 3 days without medical advice.
  • For pain: usually no more than 10 days in a row without medical advice.

Think of it like this: if you took 400 mg at 8 a.m., you’d aim for the next dose around 12–2 p.m., then again in the late afternoon or evening, but you’d count carefully to avoid going over your daily limit.

Important safety notes

Ibuprofen can irritate the stomach lining, affect the kidneys, and raise heart and blood pressure risks if used too often or at high doses, especially in older adults or people with heart, kidney, or stomach problems.

Be extra cautious or speak to a clinician first if you:

  • Have a history of stomach ulcers, GI bleeding, or severe heartburn.
  • Have kidney disease, heart failure, or are on blood thinners or certain blood-pressure meds.
  • Are pregnant , especially in the third trimester, or have asthma that worsens with NSAIDs.

Always take ibuprofen with food or milk and plenty of water to reduce stomach upset.

When to call a doctor or seek urgent help

Stop ibuprofen and get urgent medical help if you notice:

  • Black, tarry, or bloody stools, or vomiting blood.
  • Severe stomach pain.
  • Shortness of breath, chest pain, swelling of face or throat, or a rash with breathing trouble.
  • Little or no urine output or sudden swelling in legs/ankles.

Contact a doctor or nurse promptly if:

  • Pain is not better after a few days even at proper doses.
  • You feel you need ibuprofen every day for more than a week.
  • You’re also taking other NSAIDs (like naproxen, diclofenac, high-dose aspirin) and aren’t sure how to combine or avoid them.

Simple rule of thumb

  • 400 mg per dose.
  • Space doses at least 4–6 hours apart.
  • Do not exceed 1,200 mg a day on your own; higher daily totals (up to 3,200 mg) are prescription-only and must be supervised by a clinician.

If you tell me your age, weight, other meds, and what you’re treating (e.g., headache, back pain, period cramps), I can help you sanity‑check whether your current dosing pattern sounds reasonable to bring to your doctor or pharmacist.

Information gathered from public forums or data available on the internet and portrayed here.