Voltaren Side Effects

Common and serious side effects of Voltaren (diclofenac), what to watch for, and when to call your doctor.

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Information reviewed July 24, 2026

Common side effects

This is not a complete list. Always consult a doctor or pharmacist.

  • Stomach upset
  • Heartburn
  • Skin irritation (topical)
  • Increased blood pressure
  • Kidney problems with long-term use

Serious warnings

Voltaren does not carry an FDA Boxed Warning, but every prescription medicine has risks and possible interactions. Always follow your doctor's instructions and read the medication guide that comes with it.

When to call a doctor

As a general rule with any prescription medicine, contact your doctor about any side effect that is severe, persistent, or worries you. General guidance is to seek emergency care for signs of a serious allergic reaction to any medicine — such as trouble breathing or swelling of the face, lips, tongue, or throat.

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Frequently asked questions

What are the most common side effects of Voltaren?

Commonly reported side effects of Voltaren (diclofenac) include Stomach upset, Heartburn, Skin irritation (topical), Increased blood pressure, and Kidney problems with long-term use. This is not a complete list — tell your doctor or pharmacist about any side effects you experience.

Does Voltaren have any serious or boxed warnings?

Voltaren does not carry an FDA Boxed Warning, but every prescription medicine has risks and possible interactions. Always follow your doctor's instructions and read the medication guide that comes with it.

When should I call my doctor about Voltaren side effects?

As a general rule with any prescription medicine, call your doctor about any side effect that is severe, doesn't go away, or worries you. General guidance is to seek emergency care for signs of a serious allergic reaction to any medicine — such as trouble breathing or swelling of the face, lips, tongue, or throat. For advice about your situation, talk to a licensed healthcare provider.

Where can I find the full list of Voltaren side effects?

The side effects above are commonly reported ones recorded for Voltaren (diclofenac); they are not a complete list. For the full prescribing information and medication guide, check the official Voltaren label or ask your doctor or pharmacist.

Should I stop taking Voltaren if I have side effects?

General medical guidance is not to stop a prescription medicine on your own without talking to your doctor first. Your doctor can advise whether to continue, adjust, or change your treatment. This page is informational and not medical advice.

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