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. Author manuscript; available in PMC: 2021 Dec 1.
Published in final edited form as: Trends Pharmacol Sci. 2020 Oct 22;41(12):1006–1022. doi: 10.1016/j.tips.2020.10.001

Figure I. Drug–Receptor Activity Terms.

Figure I.

GPCR-targeted drugs can modulate GPCR signaling by activating the canonical signaling pathway (agonists, partial agonists) or alternative downstream signaling pathways (biased agonists). Antagonists and inverse agonists inhibit GPCR signaling. Abbreviation: GPCR, G protein-coupled receptor.