Acyclovir (Zovirax) is an antiviral used to treat infections such as cold sores, genital herpes, and shingles.

Founded in 2006, Heritage Pharmaceuticals distributes about 65 drugs in the U.S. It is part of Avet Pharmaceuticals, the exclusive U.S. commercial operations of Indian-based Emcure Ltd. The number of manufacturing locations was not readily available, but at least some are located in North America and Asia.