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Regular Aspirin (325mg): Uses, Dosage, and Safety Information

Last reviewed: December 2025

Overview

Regular-strength aspirin (325 mg) is one of the oldest and most versatile medications available. Unlike low-dose aspirin used for heart protection, regular-strength aspirin is primarily used for pain relief, fever reduction, and inflammation. It belongs to the NSAID class of medications.

Aspirin has been used for over 120 years and remains an effective option for many common ailments, though understanding when to use it—and when not to—is important.

Common Brand Names

  • Bayer Aspirin
  • Bufferin
  • Ecotrin (regular strength)
  • Various store brands

Forms Available

  • Tablets — standard 325 mg
  • Extra strength tablets — 500 mg
  • Enteric-coated tablets — dissolve in intestine
  • Buffered tablets — contain antacid for stomach protection
  • Effervescent tablets — dissolve in water
  • Chewable tablets — for faster absorption

Primary Uses

Regular-strength aspirin is used for:

  • Pain relief — headaches, muscle aches, toothaches, menstrual cramps
  • Fever reduction — effective antipyretic
  • Anti-inflammatory effects — arthritis, minor injuries
  • Acute heart attack — chewed during suspected heart attack (emergency use)

How It Works

Aspirin works through multiple mechanisms:

  • COX-1 and COX-2 inhibition — blocks enzymes that produce prostaglandins
  • Reduces prostaglandins — decreases pain, fever, and inflammation
  • Antiplatelet effect — irreversibly inhibits platelet aggregation
  • Central and peripheral effects — works both in brain and at injury site

At regular doses (325-650 mg), aspirin provides all these effects. This differs from low-dose aspirin which primarily targets platelets.

Dosing for Pain/Fever

Adults:

  • 325-650 mg every 4-6 hours as needed
  • Maximum: 4,000 mg per day
  • Take with food or water

Not recommended for:

  • Children under 18 (Reye’s syndrome risk)
  • People with aspirin allergies
  • Those with active bleeding or ulcers

Important Safety Information

Reye’s Syndrome Warning

  • Never give aspirin to children or teenagers with viral illness
  • Risk of serious liver and brain damage
  • Applies to flu, chickenpox, and other viral infections
  • Use acetaminophen or ibuprofen instead for children

Bleeding Risk

  • Aspirin affects clotting for 7-10 days after a dose
  • Inform surgeons and dentists about aspirin use
  • Avoid before planned procedures

GI Effects

  • Can cause stomach irritation and ulcers
  • Take with food
  • Risk increases with alcohol, other NSAIDs, or corticosteroids

Sources

  • FDA — Aspirin Drug Facts Label
  • MedlinePlus — Aspirin
  • American Academy of Pediatrics — Reye’s Syndrome Warning
  • UpToDate — Aspirin: Drug Information
Last reviewed: December 2025