Menjong Sorig Pharmaceuticals earlier known as Pharmaceutical and Research Unit under the Department of Medical Services in the Ministry of Health is the premier manufacturer of the traditional herbal-based medicines supplied to all health centres in Bhutan. It is a place where the modern science and technology is married with the ancient traditional knowledge. It is located in Kawa Jangsa in the capital city of Bhutan, Thimphu.

When traditional medicine was introduced as a part of the healthcare system in 1968, medicines were produced at a very low scale. In 1982, the production of traditional medicines was mechanized with the procurement of some basic grinding equipment with WHO support. By 1997, the cottage production unit was upgraded to a manufacturing unit as the Pharmaceutical and Research Unit (PRU) with modern equipment for production, research and quality control.

Menjong Sorig has the main responsibility of producing traditional medicines of assured quality and conducting research for scientific validation. MSP currently produces approximately 8-10 metric tons of 98 different essential traditional medicines annually for the healthcare services. The production list is based on the essential medicines list which is revised after every 2-3 years by a committee of experts as per the National Drug Policy. In addition, MSP also produces a dozen of other health promoting and religious herbal products for the local market. The most famous product is the Tsheringma Detox Tea. The income from the commercial products is deposited in the Revolving Fund which is used for the purchase of raw materials for the production of traditional medicines.

The present manufacturing complex was commissioned under the financial assistance of European Commission in 1994 along with two drying centers at Lingshi and Langthel which were commissioned in 1998. In 2009 another building was also constructed with the European Union support under the Medicinal & Aromatic Plants Project Phase II.