Transdermal delivery is a method of administering medication through the skin. This technique allows drugs to enter the bloodstream directly, bypassing the digestive system. It is commonly used for pain relief, hormone replacement, and other therapeutic purposes. Transdermal patches are a popular form of this delivery system, providing a controlled release of medication over time. Examples include patches for nicotine cessation and fentanyl for pain management. This method offers convenience and can improve patient compliance by reducing the need for frequent dosing.