TPG has purchased a majority stake in Surescripts, according to a news release.

Surescripts, founded in 2001 and based in Arlington, Virginia, is a health information network largely known for its e-prescribing network.

TPG, founded in 1992 and based in San Francisco, targets investments in middle market companies. The firm invests in healthcare and a number of other industries.

TPG made the investment in Surescripts through TPG Capital, the firm’s U.S. and European private equity platform.

Terms of the acquisition were not disclosed.