The effectiveness of PDT depends on the type and location of the condition being treated. It's often very effective for superficial cancers and pre-cancers. For deeper or more aggressive cancers, PDT may be used in combination with other treatments such as surgery or chemotherapy.

During a PDT session, the photosensitizing agent is applied or injected, followed by a period of time to allow the agent to be absorbed by the target cells. The area is then exposed to light to activate the photosensitizer. The procedure can take from a few minutes to over an hour, depending on the area and condition being treated.

Patients will need to avoid exposing their skin to direct sunlight and even some types of indoor light for a time before and after the treatment to prevent accidental activation of the photosensitizing agent in areas not being treated. Your doctor will provide specific guidelines based on the type of photosensitizer used.

PDT can be used on most skin types; however, the specific photosensitizing agent and type of light may be chosen based on skin type and the depth of the target tissue. Skin pigmentation can affect the absorption of the light.

Recovery varies based on the treatment area and intensity. Common effects include redness, peeling, and discomfort at the treatment site, similar to a sunburn. These symptoms usually subside within a few days, but light sensitivity may continue for a longer period.

Yes, PDT can be repeated if needed. The decision to repeat the treatment depends on the condition's response to the initial treatment and the overall health of the patient.