Naproxen: what it’s for, side effects and natural alternatives
What is naproxen and what is it for?
Naproxen is a non-steroidal anti-inflammatory drug (NSAID) that works by inhibiting cyclo-oxygenase enzymes, both COX-1 and COX-2. In plain English: it blocks substances your body makes when there’s pain, inflammation or fever. They’re called prostaglandins — the chemical messengers of “this hurts”.
What sets naproxen apart from other NSAIDs such as ibuprofen is its long half-life: it can remain in the bloodstream for up to 12–15 hours. That often allows two doses a day rather than three or four. For someone living with ongoing pain, that can make a real difference to sticking with treatment.
Main indications for naproxen
- Rheumatoid arthritis and osteoarthritis: reduces joint inflammation and associated pain.
- Ankylosing spondylitis: one of the first-line NSAIDs thanks to its longer-lasting effect.
- Period pain (dysmenorrhoea): very effective because it acts directly on uterine prostaglandins.
- Muscle pain and tendonitis: for acute inflammatory flare-ups, not just “dry” pain.
- Tension-type headache and mild migraine: an alternative to ibuprofen when that isn’t enough.
- Post-operative and dental pain: as a rescue analgesic under prescription.
Typical naproxen dose and available forms
Naproxen comes in several pharmaceutical forms, but the most common is oral tablets. I’ll be clear: all oral forms require a prescription. This isn’t something to self-medicate with.
Available forms and indicative dosing
The maximum daily dose should not exceed 1000–1100 mg in adults unless your prescriber specifically advises otherwise. In older adults or anyone with risk factors, clinicians usually start with the lowest possible dose for the shortest time needed. It’s the NSAID mantra: the lowest effective dose, for the shortest possible time.
How do you take it?
Always with food or straight after eating. Naproxen can be harsh on the stomach lining; taking it on an empty stomach is asking for trouble. If your doctor prescribes it for longer-term use, they may add a stomach-protecting medicine (omeprazole, for example).
Naproxen side effects
I’m not going to sugar-coat this. Like all NSAIDs, naproxen has genuine adverse effects. Most are dose-dependent and time-dependent: higher doses and more days mean higher risk. That’s why prescription control isn’t just bureaucracy.
The three big risks
Gastrointestinal: this is the number one issue. NSAIDs inhibit COX-1, which helps protect the stomach lining. Without that protection, the lining is exposed to acid. The result ranges from mild indigestion to ulcers and gastrointestinal bleeding. If you’ve had an ulcer before, naproxen without gastric protection is usually a poor choice.
Cardiovascular: all NSAIDs (except low-dose aspirin) slightly increase the risk of cardiovascular events. Naproxen tends to have the lowest risk within the group, but it’s not zero risk. If you have heart failure, poorly controlled high blood pressure or a history of heart attack, the benefit–risk balance needs careful thought.
Renal: prostaglandins help maintain blood flow to the kidneys. If you block them with an NSAID in someone who is dehydrated, has borderline kidney function or takes diuretics, you can trigger acute kidney injury. It sounds dramatic because it can be.
Contraindications and interactions
Who should NOT take naproxen?
- A known allergy to naproxen or any NSAID (including aspirin).
- People with NSAID-induced asthma or “Samter’s triad” (asthma, nasal polyps, aspirin intolerance).
- An active gastric or duodenal ulcer, or a history of gastrointestinal bleeding.
- Severe heart failure (NYHA III–IV).
- Severe renal impairment (creatinine clearance <30 ml/min).
- Severe hepatic impairment.
- The third trimester of pregnancy (risk of premature closure of the ductus arteriosus).
Naproxen vs ibuprofen: key differences
This is the question I hear most often at the counter: “Which is better — naproxen or ibuprofen?” The honest answer is: it depends on you, the type of pain and how long you need treatment for.
Summary table: Naproxen
| Presentation | Usual adult dose | Frequency | Note |
|---|---|---|---|
| Naproxen 250 mg tablets | 250–500 mg | Every 12 h | Common starting dose |
| Naproxen 500 mg tablets | 500 mg | Every 12 h | Standard dose in arthritis |
| Sodium naproxen 550 mg | 550 mg | Every 12 h | Equivalent to 500 mg of naproxen base |
| Topical naproxen gel | Local application | 2–3 times/day | Lower systemic absorption |
| Naproxen suppositories | 500 mg | Every 12 h | Alternative if there is oral intolerance |
Preguntas frecuentes
Referencias científicas
