Standard Adult Aspirin Dosages and Dosing Frequency
For pain relief, fever, or inflammation, adults typically take 325-650 mg every 4-6 hours as needed, not exceeding 4 grams per day.[1] Low-dose aspirin (81 mg) for heart attack or stroke prevention is taken once daily.[1]
Low-Dose Aspirin for Cardiovascular Prevention
Doctors prescribe 75-162 mg daily, usually in the morning or evening consistently. Enteric-coated versions reduce stomach irritation but follow the same schedule.[1][2] Always take with food or water to minimize upset.
High-Dose for Pain or Arthritis
Take 325-650 mg every 4 hours for acute pain, or 3.6-5.4 grams daily in divided doses for arthritis under medical supervision. Limit to 10 days without doctor advice.[1]
Children's Aspirin Dosing
Avoid regular aspirin in children under 16 due to Reye's syndrome risk; use acetaminophen or ibuprofen instead. If prescribed, dosing is weight-based (e.g., 10-15 mg/kg every 4-6 hours).[2]
What If You Miss a Dose?
For daily low-dose, take it as soon as remembered unless near the next dose—then skip and resume schedule. For pain relief, take when needed without doubling up.[1]
Risks of Overdosing or Frequent Use
Taking more than recommended increases bleeding, stomach ulcers, or kidney issues. Chronic high use raises heart risks; consult a doctor for long-term needs.[2]
[1]: FDA Aspirin Label
[2]: Mayo Clinic Aspirin Dosing