Voltaren Rapid 25 tablets can be stored for 5 years, according to the New Zealand Medicines and Medical Devices Authority.
I looked at the Voltaren information sheet on the Novartis' Web site, but couldn't find information about shelf-life.
If you haven't filled the prescription, go back to your doctor and ask about it. If you have the pills sitting in a bottle in the bathroom, then the expiration should be on the label.
If you're still not sure, you should ask your pharmacist. They tend to know that stuff really well -- they are there to help.
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