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In the US lidocaine patches without a prescription are like 4% while prescription lidocaine patches are 5%

Those numbers might not be exact as it's been a couple years since I dealt with this, but it was definitely a tiny difference.

Lidocaine is available in the US up to 5% w/o prescription. The lidocaine gel dentists use to numb your gum before injections is 20% lidocaine.

It’s a 25% difference!

Could as well be a 300% difference! :P