The D₂-like receptors are a subfamily of dopamine receptors that bind the endogenous neurotransmitter dopamine. The D₂-like subfamily consists of three G-protein coupled receptors that are coupled to G_i/G_o and mediate inhibitory neurotransmission, of which include D₂, D₃, and D₄. For more information, please see the respective main articles of the individual subtypes:

References

Adrenergic	α1 (A B D) α2 (A B C) β1 β2 β3
Purinergic	Adenosine (A1 A2A A2B A3) P2Y (1 2 4 5 6 8 9 10 11 12 13 14)
Serotonin	(all but 5-HT3) 5-HT1 (A B D E F) 5-HT2 (A B C) 5-HT (4 5A 6 7)
Other	Acetylcholine (M1 M2 M3 M4 M5) Dopamine D1 D2 D3 D4 D5 GHB receptor Histamine H1 H2 H3 H4 Melatonin (1A 1B 1C) TAAR (1 2 5 6 8 9)

Metabolites and
signaling molecules

Eicosanoid	CysLT (1 2) LTB4 1 2 FPRL1 OXE Prostaglandin DP (1 2), EP (1 2 3 4), FP Prostacyclin Thromboxane
Other	Bile acid Cannabinoid (CB1 CB2, GPR (18 55 119)) EBI2 Estrogen Free fatty acid (1 2 3 4) Hydroxycarboxylic acids 1 2 3 Lysophosphatidic acid (1 2 3 4 5 6) Lysophospholipid (1 2 3 4 5 6 7 8) Oxoglutarate PAF Sphingosine-1-phosphate (1 2 3 4 5) Succinate

Peptide

Other

Miscellaneous

Taste, bitter	TAS2R 1 3 4 5 7 8 9 10 13 14 16 19 20 30 31 38 39 40 41 42 43 45 46 50 60 Vomeronasal receptor type 1
Orphan	GPR (1 3 4 6 12 15 17 18 19 20 21 22 23 25 26 27 31 32 33 34 35 37 39 42 44 45 50 52 55 61 62 63 65 68 75 78 81 82 83 84 85 87 88 92 101 103 109A 109B 119 120 132 135 137B 139 141 142 146 148 149 150 151 152 153 160 161 162 171 173 174 176 177 182 183)
Other	Adrenomedullin Olfactory Opsin (3 4 5 1LW 1MW 1SW RGR RRH) Protease-activated (1 2 3 4) SREB (1 2 3)

Adhesion	ADGRB Brain-specific angiogenesis inhibitor 1 2 3 ADGRC Cadherin 1 2 3 ADGRE EMR 1 2 3 CD97 ADGRG 1 2 3 4 5 6 7 ADGRL Latrophilin 1 2 3 ELTD1
Orphan	GPR (56 64 97 98 110 111 112 113 114 115 116 123 124 125 126 128 133 143 144 155 157)
Other	Calcitonin CALCRL Corticotropin-releasing hormone (1 2) Glucagon (GR GIPR GLP1R GLP2R) Growth-hormone-releasing hormone PACAPR1 GPR Methuselah-like proteins Parathyroid hormone (1 2) Secretin Vasoactive intestinal peptide (1 2)

Taste, sweet	TAS1R 1 2 3 Vomeronasal receptor, type 2
Other	Calcium-sensing receptor GABA_B (1 2) Glutamate receptor (Metabotropic glutamate (1 2 3 4 5 6 7 8)) GPRC6A GPR (156 158 179) RAIG (1 2 3 4)

Frizzled	Frizzled (1 2 3 4 5 6 7 8 9 10)
Smoothened	Smoothened

Signaling pathways

Agents

cAMP-dependent pathway Ca²⁺ signaling Lipid signaling
Assistants:	Signal transducing adaptor protein Scaffold protein

By distance

Other concepts

Agonists	Benzazepines: 6-Br-APB Fenoldopam SKF-38,393 SKF-77,434 SKF-81,297 SKF-82,958 SKF-83,959 Trepipam Zelandopam Ergolines: Cabergoline CY-208,243 Dihydroergocryptine LEK-8829 Lisuride Pergolide Terguride Dihydrexidine derivatives: A-77636 A-86929 Adrogolide (ABT-431, DAS-431) Dihydrexidine Dinapsoline Dinoxyline Doxanthrine Phenethylamines: BCO-001 Deoxyepinephrine (N-methyldopamine, epinine) Dopexamine Etilevodopa Ibopamine L-DOPA (levodopa) Melevodopa L-Phenylalanine L-Tyrosine XP21279 Others: A-68930 Apomorphine Isocorypalmine Nuciferine PF-6649751 PF 6669571 Propylnorapomorphine Rotigotine SKF-89,145 SKF-89,626 Stepholidine Tavapadon Tetrahydropalmatine
PAMs	Tetrahydroisoquinolines: DETQ DPTQ Mevidalen
Antagonists	Typical antipsychotics: Butaclamol Chlorpromazine Chlorprothixene Flupentixol (flupenthixol) (+melitracen) Fluphenazine Loxapine Perphenazine (+amitriptyline) Pifluthixol Thioridazine Thiothixene Trifluoperazine (+tranylcypromine) Zuclopenthixol Atypical antipsychotics: Asenapine Clorotepine Clotiapine Clozapine DHA-clozapine Fluperlapine Iloperidone Norclozapine Norquetiapine Olanzapine (+fluoxetine) Paliperidone Quetiapine Risperidone Tefludazine Zicronapine Ziprasidone Zotepine Others: Berupipam Ecopipam EEDQ Metitepine (methiothepin) Odapipam Perlapine SCH-23390

Agonists

Antagonists

See also