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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Hand-washing is important after handling or applying the lidocaine patch. Contact with eyes should be avoided. The zipper pouch containing the lidocaine patches should be completely closed after opening