Botox therapy may be addictive, UK study finds

London - Botox (Allergan) therapy may be addictive, researchers in the United Kingdom report.

Doctors found that 40 percent of patients using Botox expressed a compulsive desire for additional treatments, according to research to be presented at a meeting of the British Association of Aesthetic Plastic Surgeons.

The number of patients treated with Botox increased by 50 percent in 2005, researchers said.

Researchers surveyed clients at 81 clinics and compared Botox users to people who used less invasive treatments. They found: