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Like all medicines, Voltaren 24 Hour Patch can cause side effects, although not everybody gets them.
Some rare and very rare side effects might be serious.
If the patient notices any signs of allergy, stop using Voltaren 24 Hour Patch and tell a physician or pharmacist immediately: Skin rash with blisters, hives (may affect between 1 and 10 in very 10,000 people). Wheezing, shortness of breath or feeling of tightness in the chest (asthma) (may affect less than 1 in every 10,000 people). Swelling of the face, lips, tongue or throat (may affect less than 1 in every 10,000 people).
Other side effects which may occur are usually mild, passing and harmless.
Common side effects (may affect between 1 and 10 in every 100 people): Skin rash, itching, reddening or smarting of the skin.
Rare side effects (may affect between 1 and 10 in every 10,000 people): Swelling, colouration and staining of the skin.
Very rare side effects (may affect less than 1 in every 10,000 people): The skin may be more sensitive to the sun. Possible signs are sunburn with itching, swelling and blistering.
