The American College of Clinical Pharmacy (ACCP) Board of Regents charged the 2020 to 2021 Publications Committee to review and revise the 2004 ACCP guideline statement on therapeutic interchange. The committee reviewed previous guidelines and relevant published literature. After development of new guidelines, the committee and Board of Regents voted in support of the updated guideline. The ACCP reaffirms its support of therapeutic interchange. Additional recommendations for appropriate implementation and practice of therapeutic interchange are provided. Therapeutic interchange is an important tool in optimizing patient care, improving access to care, and reducing the cost of medications.