Aleve Dosage Calculator

Calculate the appropriate Aleve (naproxen sodium) dosage based on your weight, age, and pain severity. This calculator provides safe dosing recommendations following FDA guidelines for over-the-counter naproxen sodium use.

Updated June 2026 · How this works

How It Works
The formula, explained simply

The Aleve dosage calculator determines safe naproxen sodium dosing based on FDA over-the-counter guidelines, considering your age, weight, and pain severity. Aleve contains 220 mg of naproxen sodium per tablet, which is a non-steroidal anti-inflammatory drug (NSAID) that reduces pain, inflammation, and fever.

Unlike faster-acting pain relievers, Aleve provides longer-lasting relief, typically 8-12 hours per dose. This extended duration means you need fewer doses throughout the day compared to acetaminophen or ibuprofen. The calculator recommends starting with one tablet (220 mg) for mild to moderate pain, with the option of two tablets (440 mg) for severe pain as the maximum initial dose.

Weight considerations become important for individuals under 50 kg (110 lbs), where a slightly reduced initial dose may be more appropriate. Age restrictions are critical - Aleve is not recommended for children under 12 due to increased risk of serious side effects. The calculator enforces these safety limits while providing personalized dosing recommendations.

Proper Aleve dosing requires understanding both the immediate dose and daily limits. The maximum daily dose is 660 mg (3 tablets) in 24 hours, with doses spaced at least 8-12 hours apart. Taking Aleve with food reduces the risk of stomach irritation, a common side effect of NSAIDs.

When To Use This
Right tool, right situation

Use the Aleve dosage calculator when you need longer-lasting pain relief for conditions like headaches, muscle aches, arthritis pain, menstrual cramps, or minor injuries. Aleve is particularly effective for inflammatory conditions due to its NSAID properties, making it ideal for pain accompanied by swelling or inflammation.

Consider Aleve over other pain relievers when you want less frequent dosing - its 8-12 hour duration means fewer pills throughout the day compared to acetaminophen or ibuprofen. This makes it convenient for chronic conditions like arthritis or back pain where consistent pain management is needed.

Avoid using this calculator and choose alternatives when dealing with children under 12, individuals with kidney or heart disease, active stomach ulcers, or those taking blood thinners. Pregnant women, especially in the third trimester, should not use naproxen sodium without medical supervision.

The calculator is most valuable when you're unsure about appropriate dosing for your specific situation, particularly if you're smaller than average, experiencing severe pain, or want to ensure you stay within safe daily limits. Always consult healthcare providers for pain lasting more than 10 days or for serious injuries requiring medical attention.

Common Mistakes
Why results sometimes look wrong

The most serious mistake with Aleve dosing is exceeding the 660 mg daily limit or taking doses too frequently. Unlike shorter-acting pain relievers, Aleve's 8-12 hour duration means you don't need to redose every 4-6 hours. Taking Aleve every 4 hours like ibuprofen can quickly lead to dangerous overdose levels.

Another critical error is giving Aleve to children under 12 or assuming that cutting tablets makes it safe for young children. Naproxen sodium is not approved for pediatric use under 12 years, and age-appropriate alternatives should be used instead. Weight-based calculations that might work for other medications don't apply to Aleve in children.

Many people make the mistake of taking Aleve on an empty stomach, significantly increasing the risk of stomach bleeding and ulcers. Always take naproxen sodium with food or milk. Additionally, combining Aleve with alcohol or other NSAIDs (like ibuprofen or aspirin) multiplies the risk of serious gastrointestinal and kidney problems.

Ignoring contraindications is another common error. People with kidney disease, heart problems, high blood pressure, or stomach ulcers should consult a doctor before using Aleve. Taking maximum doses for extended periods without medical supervision can cause serious organ damage.

The Math
Worked examples and deeper derivation

Aleve dosage calculations follow FDA-approved over-the-counter guidelines for naproxen sodium. Each tablet contains exactly 220 mg of naproxen sodium. For standard dosing, mild to moderate pain requires 1 tablet (220 mg), while severe pain may warrant 2 tablets (440 mg) as the maximum initial dose.

Weight-based adjustments apply primarily to individuals under 50 kg, where the dose may be reduced by approximately 20% for safety. The calculation is: Adjusted dose = Base dose × 0.8 for weights below 50 kg. However, the minimum effective dose remains 220 mg (1 tablet).

Daily dosing limits follow a strict maximum of 660 mg in 24 hours, calculated as: Maximum tablets per day = 660 mg ÷ 220 mg = 3 tablets maximum. With minimum 8-12 hour spacing between doses, the typical pattern is 220 mg every 12 hours or 220 mg every 8 hours if needed, never exceeding the daily limit.

Age restrictions are absolute - no mathematical scaling applies to children under 12 years old, as naproxen sodium carries increased risks in this population regardless of weight-based calculations.

Adult with headache
30-year-old, 70 kg, mild pain
One 220 mg tablet is recommended for mild pain relief.
Adult with back pain
45-year-old, 180 lbs, severe pain
Two tablets (440 mg) provide maximum initial relief for severe pain.
Teenager with sports injury
16-year-old, 60 kg, moderate pain
One 220 mg tablet is appropriate for moderate pain in adolescents.

Common questions

How often can I take Aleve for pain relief?
Take Aleve every 8-12 hours as needed, with a maximum of 3 tablets (660 mg) in 24 hours. Unlike other pain relievers that require dosing every 4-6 hours, Aleve's longer duration means less frequent dosing for sustained naproxen sodium pain relief.
What is the maximum Aleve dosage per day?
The maximum over-the-counter Aleve dosage is 660 mg (3 tablets) in a 24-hour period. Taking more than this amount increases the risk of serious side effects including stomach bleeding and kidney problems. Never exceed the daily Aleve limit without medical supervision.
Can children take Aleve for pain and fever?
Aleve is not recommended for children under 12 years old. The naproxen sodium in Aleve can cause serious side effects in young children. Use age-appropriate alternatives like children's acetaminophen or ibuprofen, and consult your pediatrician for proper dosing guidance.

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