WASHINGTON AP – Allergan Inc., the maker of wrinkle-smoothing Botox, says it will pay $600 million to settle a five-year-long federal investigation into its marketing of the top-selling, botulin-based drug.

The company said Wednesday in a statement it will plead guilty to one misdemeanor charge of “misbranding,” in which the company’s marketing led physicians to use Botox for unapproved uses. Those included the treatment of headache, pain, spasticity and cerebral palsy in children.