TY - CHAP M1 - Book, Section TI - Drug Interactions A1 - Freeman, Brian S. A1 - Berger, Jeffrey S. PY - 2024 T2 - Anesthesiology Core Review: Part One: BASIC Exam, 2nd Edition AB - The formulation of drugs is often overlooked but may contribute to bioavailability and desired effects. For example, adding epinephrine to a local anesthetic solution gives the solution a much lower pH due to highly acidic commercial preparations of epinephrine. A more acidic solution of local anesthetic results in lower concentration of the ionized, membrane permeable form of the local anesthetic. This equilibrium change decreases tissue penetration and diminishes the desired effect. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/10/04 UR - accessanesthesiology.mhmedical.com/content.aspx?aid=1204766450 ER -