Typical phonophoresis parameters include:

Typical phonophoresis parameters include:

• A. Continuous ultrasound with 1.0 to 1.5 W/cm2 for 5 to 15 minutes.
• B. Pulsed ultrasound at 0.5 W/cm2 for 1 to 3 minutes.
• C. Intermittent pulsed ultrasound at high frequency for 20 minutes.
• D. Continuous ultrasound at 0.2 W/cm2 for 60 minutes.

Answer: (A)

Phonophoresis relies on ultrasound to increase skin permeability and help move a topical drug into underlying tissues. Using continuous ultrasound at about 1.0 to 1.5 W/cm2 for 5 to 15 minutes provides a sustained energy delivery that enhances penetration without excessive heating or prolonged exposure. This combination strikes a balance: enough energy to promote diffusion and tissue absorption, but not so long or intense that safety concerns arise. Other options either underdeliver energy (too low intensity or too short a time) or rely on settings that aren’t standard for delivering drugs transdermally, making them less effective for phonophoresis.

Phonophoresis relies on ultrasound to increase skin permeability and help move a topical drug into underlying tissues. Using continuous ultrasound at about 1.0 to 1.5 W/cm2 for 5 to 15 minutes provides a sustained energy delivery that enhances penetration without excessive heating or prolonged exposure. This combination strikes a balance: enough energy to promote diffusion and tissue absorption, but not so long or intense that safety concerns arise. Other options either underdeliver energy (too low intensity or too short a time) or rely on settings that aren’t standard for delivering drugs transdermally, making them less effective for phonophoresis.