RT Book, Section A1 Katzung, Bertram G. A1 Kruidering-Hall, Marieke A1 Tuan, Rupa Lalchandani A1 Vanderah, Todd W. A1 Trevor, Anthony J. SR Print(0) ID 1180559468 T1 Important Drug Interactions & Their Mechanisms T2 Katzung & Trevor's Pharmacology: Examination & Board Review, 13e YR 2021 FD 2021 PB McGraw-Hill Education PP New York, NY SN 9781260117127 LK accesspharmacy.mhmedical.com/content.aspx?aid=1180559468 RD 2024/03/28 AB Drug interactions occur when one drug modifies the actions of another drug in the body. Drug interactions can result from pharmacokinetic alterations (eg, changes in absorption, distribution, and elimination), pharmacodynamic changes (additive, synergistic, or antagonistic effects), or a combination of both. Interactions between drugs in vitro (eg, precipitation when mixed in solutions for intravenous administration) are usually classified as drug incompatibilities, not drug interactions.