What is the address for the librarylannett company? Lannett Company, Inc. 13200 Townsend Road. Philadelphia, PA 19154. (215) 333-9000Careers: chk.tbe.taleo.net/chk05/ats/careers...What is lannett company known for? Company Overview. Our business is based on partnerships. Founded in 1942, Lannett Company, Inc. is a leading manufacturer of over 100 unique pharmaceutical product families that save and enhance people’s lives.Who is targetlannett company? Lannett Company, Inc. manufactures, markets and/or distributes more than 90 drugs in the United States. Medications listed here may also be marketed under different names in different countries.