A transdermal patch is a small adhesive patch that is applied to the skin to deliver medication directly into the bloodstream. This method allows for a controlled release of the drug over time, providing a steady dosage without the need for injections or oral medications. Commonly used for pain relief, hormone replacement, and smoking cessation, these patches are designed to be easy to use and can be worn for several days. The patch works by utilizing the skin's permeability to absorb the medication. Once applied, the active ingredients in the patch penetrate the skin layers and enter the bloodstream, where they can take effect. This delivery system is beneficial for patients who may have difficulty swallowing pills or require consistent medication levels, making it a popular choice in modern medicine.