Title: synergism Long Title: IUPAC Gold Book - synergism DOI: 10.1351/goldbook.S06229 Status: current Definition Pharmacological or toxicological interaction in which the combined biological effect of two or more substances is greater than expected on the basis of the simple summation of the toxicity of each of the individual substances. Related Term - toxicity: https://goldbook.iupac.org//terms/view/T06414 Source - PAC, 1993, 65, 2003. 'Glossary for chemists of terms used in toxicology (IUPAC Recommendations 1993)' on page 2103 (https://doi.org/10.1351/pac199365092003) Other Outputs - html: https://goldbook.iupac.org/terms/view/S06229/html - json: https://goldbook.iupac.org/terms/view/S06229/json - xml: https://goldbook.iupac.org/terms/view/S06229/xml Citation: Citation: 'synergism' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.S06229 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. Accessed: 2026-06-07T09:29:02+00:00