Armstrong Pharmaceuticals, Inc. was founded in 1955 as a manufacturer of specialty aerosol products. Armstrong produced a wide array of topical, personal care, and pharmaceutical products. Since 1993, Armstrong has focused exclusively on pharmaceutical products, primarily in the area of inhaled respiratory drugs that are delivered by Metered Dose Inhalers (MDIs). On October 9, 2003, Amphastar Pharmaceuticals, Inc., a specialty and generic pharmaceutical company, acquired Armstrong.