Phonophoresis is a therapeutic technique that combines ultrasound with topical medications to enhance drug delivery through the skin. The ultrasound waves create vibrations that help the medication penetrate deeper into the tissues, making it more effective for treating conditions like pain and inflammation. This method is often used in physical therapy settings to address various musculoskeletal issues. By using ultrasound technology, practitioners can target specific areas of the body, providing localized treatment while minimizing systemic side effects associated with oral medications.