I hadn't actually read this study but I came across these quotes by a Dr. Roger Dailey. Has anyone got additional information or thoughts on this?

"After two years of treatment at recommended intervals, patients can potentially cut the frequency, and thus the cost, of their Botox treatments by half," professor Roger A. Dailey, MD, FACS, reported at the recent meeting of the American Society of Aesthetic Plastic Surgeons. This finding counters the typical recommendation of injections every three months to maintain results.

"We found that after the patient receives Botox Cosmetic injections every four months for two years, the frequency of the injections can be changed to every six months and still achieve good results," Dailey explained. "This demonstrates patients have the ability to achieve good results with broader treatment schedules and ultimately at a lower overall treatment cost."

The study on 50 women between ages 30 and 50, made possible by an educational grant from Allergan, also confirmed that Botox has a prophylactic effect, not only eliminating lines between the eyebrows, but preventing them, as well.