El Roi Medical Supplies Co. was registered at the SEC on April 10, 2007 as a partnership. The company's founders are brothers Thomas K. Ong Jr. and Terence K. Ong.

El Roi Medical Supplies Co. is located at 60 Victoria Avenue, Brgy. Mariana, New Manila, Quezon City. It is located in front of St. Luke's Medical Center and behind Goldilocks E. Rodriguez Ave.

The company opened for business on July 2008 selling medical supplies.

The Bureau of Food and Drugs (BFAD) granted the company the license to operate as a drug wholesaler on August 14, 2008. Following this, the BFAD granted the company the license to operate a drugstore on September 4, 2008. To reflect the additional business scope, the company changed its name to El Roi Medical Supplies (Pharmacy) Co.

Its clients are the health care professionals, students and patients of St. Luke's Medical Center, National Children's Hospital and E. De Los Santos Hospital, Trinity University, De Los Santos - STI College and St. Joseph College.

The company sells a wide range of medical supplies, equipment and generic drugs in an air conditioned facility. It specializes in selling generic intravenous drugs in vials and ampoules.

The company's email address is thommkong@yahoo.com.