FFL Partners has announced an investment in Apex Infusion.

Apex, founded in 2006 and based in Signal Hill, California, is a provider of ambulatory infusion therapy services.

FFL, based in San Francisco, invests in middle market companies within healthcare and business services. Founded in 1997, the firm generally commits $50 million to $200 million to individual transactions and purses control and minority stake transactions.

Terms of the investment were not disclosed.