Do NOT use Diclofenac Gel if:

• you are allergic to any ingredient in Diclofenac Gel, including benzyl alcohol, polyethylene glycol, or hyaluronate sodium.

Some medical conditions may interact with Diclofenac Gel. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

• if you are pregnant, planning to become pregnant, or are breast-feeding
• if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
• if you have allergies to medicines, foods, or other substances
• if you have had a severe allergic reaction (eg, a severe rash, hives, difficulty breathing, dizziness) to aspirin or an NSAID (eg, celecoxib, ibuprofen, naproxen) in the past
• if you have growths in the nose (nasal polyps), severe kidney or liver problems, porphyria, asthma, or stomach or intestinal ulcers or bleeding.

Some medicines may interact with Diclofenac Gel. Tell your health care provider if you are taking any other medicines, especially any of the following:

• Aspirin or NSAIDs (eg, ibuprofen) because the risk of their side effects may be increased by Diclofenac Gel.

This may not be a complete list of all interactions that may occur. Ask your health care provider if Diclofenac Gel may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

Important safety information:

• Diclofenac Gel is for external use only. Avoid contact with the eyes. If you get Diclofenac Gel in your eyes, rinse thoroughly with cool tap water.
• Diclofenac Gel has diclofenac in it. Before you start any new medicine, check the label to see if it has diclofenac in it too. If it does or if you are not sure, check with your doctor or pharmacist.
• Diclofenac Gel may cause you to become sunburned more easily. Avoid the sun, sunlamps, or tanning booths until you know how you react to Diclofenac Gel. Use a sunscreen or wear protective clothing if you must be outside for more than a short time. 
• Improvement usually occurs within 30 days after you stop using Diclofenac Gel. If no improvement is seen, contact your doctor.
• Do not use other skin products (eg, cosmetics, lotions, sunscreens) on the treated area without checking with your doctor.
• Diclofenac Gel should not be used in children; safety and effectiveness in children have not been confirmed.
• Pregnancy and breast-feeding: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Diclofenac Gel while you are pregnant. Diclofenac Gel is not recommended during the last 3 months (third trimester) of pregnancy because of the potential for fetal harm. It is not known if Diclofenac Gel is found in breast milk. Do not breastfeed while taking Diclofenac Gel.

All medicines may cause side effects, but many people have no, or minor, side effects.

Check with your doctor if any of these most common side effects persist or become bothersome:

Abnormal skin sensations; back pain; dry skin; peeling, scaling, or flaking.

Seek medical attention right away if any of these severe side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); chest pain; eye redness or swelling (conjunctivitis); fever, chills, or persistent sore throat; inflammation or severe irritation of the skin; muscle pain; open sores on the skin (ulcers).

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider.