I have two bad knees due to osteoarthritis and at times I want to use one on each knee.
No you shouldn't use two Flector patches at a time and you shouldn't halve the patch either.
Just apply one patch to the area as directed. How many times a day are you instructed to apply the patch. If it is twice a day then perhaps you could alternate the knees. All the best.
I have been told that I can by the pharmacy. Since the medicine is diffused in the patch and isn't a gel between two different layers there's no way it could increase the dose. I also use multiple patches at the same time since the amount of diclofenac absorbed into the bloodstream is so much lower than a single pill would give you I feel it's a safer option than reaching for the ibuprofen. But then I have had GI bleeding from the "harmless" over the counter NSAID and 15,000 people die every year from it so use your best judgement. Here's a link comparing the amounts of diclofenac in the bloodstream by the different delivery methods if you're interested. jeffrey-fudin/2015/07/should-topical-nsaids-have-strict-heart-risk-warnings
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