Naproxen is a commonly prescribed medicine in the UK, used for pain. If you have just been prescribed naproxen, this page explains what it is, the brands and strengths it comes in, how to take it, and how to have it dispensed and delivered free on the NHS with PillSorted.
This content has been medically reviewed and approved by Zeinab Ardeshir (GPhC 2075730), Superintendent Pharmacist at PillSorted (GPhC-registered online pharmacy 9011258). Last reviewed: 14 July 2026.
What is naproxen?
Naproxen is an anti-inflammatory painkiller (NSAID) used for pain and inflammation, including joint, muscle and period pain.
Brands and strengths
Naproxen is the name of the active ingredient. In the UK it is sold as generic naproxen and under brand names including Naprosyn, Arthrosin and Nexocin — all contain the same active ingredient and work the same way. Common strengths:
- Naproxen 250 mg tablets
- Naproxen 500 mg tablets
- UK brands: Naprosyn, Arthrosin and Nexocin
What naproxen is used for
- Pain and inflammation
- Arthritis and joint pain
- Period pain
How to take naproxen
Take with or just after food to protect your stomach. Your prescriber may also give a stomach-protecting medicine. Always follow your prescriber’s instructions (BNF).
Side effects
Common effects include indigestion and stomach upset. Tell a clinician about black stools or stomach pain, and take it with food. This is not a full list — see the patient information leaflet (BNF).
Naproxen: frequently asked questions
Yes. Naprosyn is a brand name for naproxen; the generic is the same active ingredient.
NSAIDs can irritate the stomach, so taking it with or after food reduces the risk.
Yes. If you have an NHS prescription for naproxen, you can nominate PillSorted as your NHS pharmacy and we will dispense and deliver it to your door for free.
Get your naproxen delivered free on the NHS
If you have an NHS prescription for naproxen, PillSorted dispenses and delivers it to your door — completely free. Nominate PillSorted as your NHS pharmacy once, and we take care of your repeat prescriptions from then on.
What you get
- Free delivery, every time — your medicine posted to your door, always free.
- Your whole family, one account — manage everyone’s prescriptions in one place.
- Real pharmacists, every prescription — every order checked by our UK pharmacist team.
How it works
- Choose PillSorted as your NHS pharmacy
- We collect your prescription from your GP
- Your medication is delivered free to your door
Sources: NICE; BNF — Naproxen.
This page is for general information only and is not a substitute for advice from your GP or pharmacist. Always take your medicine exactly as prescribed. For advice about your own health, consult a clinician.