Voltaren (Diclofenac) 25–75 mg Tablets and 1% Gel: Prescription NSAID for Arthritis, Ankylosing Spondylitis & Joint Pain

Information last reviewed: May 2026 — for educational purposes only.

Voltaren (diclofenac sodium) is one of the most widely prescribed NSAIDs worldwide, available as oral tablets for systemic anti-inflammatory therapy and as a topical gel with an OTC 1% formulation approved for joint pain. Oral diclofenac requires a prescription; the topical gel at 1% strength (Voltaren Arthritis Pain) became available OTC in the United States in 2020, offering localised joint pain relief with minimal systemic exposure. Higher-concentration prescription gels (3%) and diclofenac patch (Flector 180 mg) remain prescription-only.

What Is Diclofenac?

Diclofenac belongs to the phenylacetic acid class of NSAIDs. Like other NSAIDs, it inhibits both COX-1 and COX-2, and also has some inhibition of lipoxygenase (5-LOX) that may contribute to additional anti-inflammatory benefit. Diclofenac's oral bioavailability is moderate (~50–60%) due to first-pass hepatic metabolism, and it has a shorter plasma half-life (1–2 hours) than naproxen, requiring more frequent dosing. Extended-release oral formulations (Voltaren XR) allow once-daily dosing for OA.

The topical 1% gel works by penetrating skin and achieving therapeutic diclofenac concentrations in the underlying joint tissue while systemic plasma concentrations remain very low — roughly 5% of equivalent oral doses — making it suitable for patients who cannot tolerate oral NSAIDs due to GI risk or cardiovascular concerns.

Prescription vs. OTC Status

OTC: Voltaren Arthritis Pain 1% gel — adults apply 2–4 g to affected joint up to 4 times daily; max 32 g/day across all joints. No prescription required for the 1% gel in the US.
Prescription: Oral tablets (25 mg, 50 mg, 75 mg, extended-release 100 mg), the 3% topical gel (for actinic keratosis — Solaraze), and diclofenac patch (Flector) are all Rx-only. Diclofenac sodium 50 mg and 75 mg immediate-release tablets are the most commonly prescribed oral forms.

Forms and Strengths

• 25 mg tablets — lower doses for elderly patients and mild arthritis
• 50 mg tablets (IR) — standard arthritis dose; 50 mg 2–3 times daily for OA/RA
• 75 mg delayed-release tablets — higher dose for RA and ankylosing spondylitis; 75 mg twice daily
• 100 mg extended-release tablets (XR) — once-daily OA dosing
• 1% topical gel (OTC) — Voltaren Arthritis Pain; for hands, wrists, elbows, feet, ankles, knees
• 3% topical gel (Rx) — Solaraze; indicated for actinic keratosis of the skin, not arthritis
• Flector patch 180 mg (Rx) — applied twice daily to most painful area for acute minor strains, sprains, contusions
• Zipsor 25 mg liquid-filled capsules — for mild-to-moderate acute pain in adults
• Cambia powder for oral solution 50 mg — diclofenac potassium dissolved in water; for acute migraine treatment

Price of Generic Diclofenac

Generic diclofenac sodium tablets are inexpensive with or without insurance. Generic 75 mg delayed-release tablets are priced very low per pill at major US pharmacies. The OTC Voltaren gel is moderately priced; generic topical diclofenac 1% gel is available at lower cost from generic manufacturers.

Frequently Asked Questions

Can Voltaren gel be used without a prescription?

Yes — the Voltaren Arthritis Pain 1% gel is sold OTC in the United States for arthritis pain in the hands, wrists, elbows, feet, ankles, and knees. No prescription is required. However, the higher-concentration 3% gel and Flector patch remain prescription-only. The OTC gel is not approved for shoulders, hips, or spine pain.

How long does it take for diclofenac tablets to work?

Immediate-release oral diclofenac typically begins to produce analgesia within 30–60 minutes, with peak effect at 2–3 hours. For chronic arthritis, regular dosing over several days builds up anti-inflammatory benefit. Extended-release forms provide more sustained but slower onset. The topical gel may take a few days of consistent application to reach maximal effect in arthritis joints.

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