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You can't. They have no psychoactive effects, However,

This is a transderm patch, so most people -- doctors too - don't think about how the lidocaine is delivered. The closer to the heart, the greater the chance of cardio-effects. The back, knees, elbows -- all great. but do keep in mind it does a significant lidocaine load, which can slow the heart. If you use lidocaine patches, make certain to read the precautions on the box.

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10y ago

What else can I help you with?