Substance that reverses or reduces the effect induced by an agonist.
Substance that attaches to and blocks cell receptors that normally bind naturally occurring substances.
See also: agonist
Source: PAC, 1993, 65, 2003. 'Glossary for chemists of terms used in toxicology (IUPAC Recommendations 1993)' on page 2014 (https://doi.org/10.1351/pac199365092003)