Naproxen: Uses, Dosage, Side Effects, Interactions & Safety

Pediatric Dosing (weight‑based)

n children ≥2 years, doses are typically 5 mg/kg twice daily, determined by a pediatric clinician and the formulation used; not all OTC products are appropriate in children.

Onset, Duration & How Long It Lasts

Most people feel relief within 30–60 minutes, with fuller effect over several hours. Pain relief can last up to 12 hours for many indications, especially with naproxen’s longer half‑life compared with some other OTC pain relievers.

Missed Dose & Overdose

• Missed dose (scheduled use)Take it when remembered unless it’s close to your next dose, don’t double up.
• OverdoseSeek emergency care or contact Poison Control immediately. Symptoms can include nausea, vomiting, abdominal pain, dizziness, drowsiness, and potentially GI bleeding or kidney problems.

Blood Thinners & Antiplatelets

Warfarin, DOACs, and antiplatelets like clopidogrel: increased GI bleeding risk when combined with naproxen. Co‑administration requires medical oversight.

Antidepressants (SSRIs/SNRIs)

SSRIs/SNRIs (e.g., sertraline, fluoxetine, venlafaxine) may increase bleeding risk with NSAIDs. Discuss protective strategies (e.g., PPI) with your clinician.

Other NSAIDs, Aspirin & Alcohol

Do not combine naproxen with ibuprofen, ketoprofen, or other NSAIDs; it’s acceptable to combine with acetaminophen for short periods if needed. Limit/avoid alcohol to reduce GI bleeding risk.

Blood Pressure, Heart & Kidney Medicines

• ACE inhibitors/ARBs and diuretics: NSAIDs may blunt BP control and stress the kidneys (“triple whammy” risk when combined).

• Lithium and methotrexate: naproxen may raise levels, monitoring may be needed. Corticosteroids also raise GI risk when combined.

Heart Disease, Stroke & Vascular Risk

Because of the class warning, people with heart disease, prior heart attack/stroke, or many risk factors should use naproxen only if benefits outweigh risks and at the lowest effective dose for shortest duration.

Stomach/Ulcer or Bleeding History

Those with past ulcer, GI bleed, or who take other bleeding‑risk agents should consider alternatives or protective therapy per clinician advice.

Kidney or Liver Problems; Older Adults; Asthma

Use requires caution and clinician guidance if you have kidney/liver disease, heart failure, dehydration, or asthma. Older adults are more vulnerable to GI and renal side effects.

Food, Hydration & Label Checks

• Take with food or milk if your stomach is sensitive; keep well hydrated. 

• Read labels to avoid duplicate NSAIDs in multi‑symptom products.

How to Store Naproxen

Store at room temperature, away from heat/moisture; keep bottles tightly closed and out of reach of children and pets.

Naproxen vs. Ibuprofen

Both are NSAIDs. Naproxen’s longer duration (up to ~12 hours) can be convenient for twice‑daily dosing, while ibuprofen is often taken every 6–8 hours. Choice depends on response, risk profile, and clinician advice. Don’t combine them.

Naproxen vs. Acetaminophen

Acetaminophen reduces pain/fever but not inflammation and lacks the same GI/CV risks; however, it carries livertoxicity risk at high doses. Some people alternate or combine acetaminophen with naproxen (short‑term) per clinician guidance. (General principle; follow your provider’s direction.)