How should used Rapydan (lidocaine + tetracaine) medicated plasters be folded and disposed of?

Used Rapydan (lidocaine + tetracaine) medicated plasters still contain substantial active ingredients and should be folded adhesive-side inwards so the release-regulating membrane is not exposed, then returned to a pharmacy for safety and environmental reasons, never flushed down the toilet, placed in liquid waste disposal systems or thrown into household waste.