Can Levulan Treatment Be Done While On BP Medications?

I have two questions: (1) my dermatologist suggests doing the Levulan Kerastick treatments in one 3 hour session yet the literatures suggests that they should be a day or so apart. Will either approach work?
(2) although I am healthy I take meds to control blood pressure. Will the Levulan treatment interfere with maintaining my blood pressure at a safe level?