Transdermal drug delivery is a method of administering medication through the skin. This technique allows drugs to enter the bloodstream directly, bypassing the digestive system. Common forms include patches, gels, and creams, which release the medication gradually over time. This delivery system is beneficial for patients who require consistent drug levels or have difficulty swallowing pills. It can be used for various treatments, including pain management and hormone replacement therapy. Examples of transdermal products include nicotine patches and hormonal contraceptive patches.