Pharmaceutical US drug firm Allergan (NYSE: AGN), best known as the maker Botox (onabotulinumtoxinA) anti-wrinkle injections, has entered into a definitive agreement with SkinMedica to acquire the privately held company's topical aesthetics skin care business. Under the terms of the agreement, Allergan will pay SkinMedica $350 million up-front (subject to certain adjustments) for the business, which includes a variety of "physician dispensed" non-prescription aesthetic skin care products and prescription products. 18 November 2012