What dose of aspirin is safe for adults?
For most adults, common over-the-counter (OTC) aspirin dosing is based on the product label. Typical adult use is for pain/fever at 325 mg to 650 mg per dose, taken every 4 to 6 hours as needed. Daily totals are usually capped on the label (often no more than 4,000 mg in 24 hours for self-treatment), but the exact limit depends on the specific aspirin strength you have.
How many tablets is that, depending on tablet strength?
Because aspirin pills come in different strengths, the “how many” depends on mg per tablet:
- If your tablet is 325 mg, then 1 to 2 tablets per dose is a common OTC range.
- If your tablet is 81 mg, that’s often treated differently (many people use low-dose aspirin as a heart-risk medicine rather than for pain/fever, and higher dosing should follow a clinician’s guidance).
Check the mg marked on your bottle and match the dose to the label instructions.
How often can you take aspirin?
OTC instructions generally let you repeat aspirin every 4 to 6 hours if symptoms continue. Do not take more often than the label says.
Who should not take aspirin (or should ask a clinician first)?
Avoid or ask first if you:
- Have a history of stomach ulcers or GI bleeding
- Take blood thinners (or have a bleeding disorder)
- Have asthma that worsens with aspirin/NSAIDs
- Are pregnant (especially later pregnancy)
- Are giving it to a child or teen with a viral illness (aspirin can be dangerous for them)
What’s an overdose warning sign?
Get urgent help if someone has taken too much or has symptoms like severe ringing in the ears, confusion, vomiting, rapid breathing, or extreme drowsiness.
A key question to answer accurately
How old is the person taking aspirin, and what strength is on the label (81 mg, 325 mg, 500 mg, etc.)? If you tell me those two details and whether it’s for fever/pain or a heart condition, I can translate the label dosing into the number of tablets per dose.