Potent, selective CB1 cannabinoid receptor antagonist/inverse agonist (Ki values are 12 and 4200 nM for CB1 and CB2 receptors respectively). Increases locomotor activity following systemic administration in vivo. Analog of SR141716A (Ki = 14 nM).

Pramipexole is a dopamine agonist of the non-ergoline class indicated for treating Parkinson's disease (PD) and restless legs syndrome (RLS).

Pramipexole is a partial/full D2S, D2L, D3, D4, receptor agonist with a Ki of 3.9, 2.2, 0.5, 5.1 nM.

Pravadoline is a cannabimimetic aminoalkylindole agonist of the cannabinoid receptors and an inhibitor of Cox-1 and Cox-2, demonstrating powerful analgesic effects through the combination of these actions.

PRE-084 hydrochloride is a high affinity, selective σ1 agonist (Ki values are 2.2 and 13091 nM for σ1 and σ2 receptors respectively).

Preladenant(SCH 420814) is a potent and selective antagonist at the adenosine A2A receptor.

PrNMI is a peripherally restricted cannabinoid 1 receptor (CB1R) agonist, significantly alleviates spontaneous pain behaviors in the animals.

Prochlorperazine is a dopamine (D2) receptor antagonist that belongs to the phenothiazine class of antipsychotic agents. It is also a highly potent typical antipsychotic.

Prostaglandin E2 is a hormone-like substance that participate in a wide range of body functions such as the contraction and relaxation of smooth muscle, the dilation and constriction of blood vessels, control of blood pressure, and modulation of inflammation.

Prucalopride is a selective, high affinity 5-HT receptor agonistfor 5-HT4a and 5-HT4b with Ki of 2.5 nM and 8 nM, respectively.

Prucalopride succinate is a selective, high affinity 5-HT4 receptor agonist with pKi of 8.6/8.1 for 5-HT4a/4b.

PRX-08066 is a selective 5-hydroxytryptamine receptor 2B (5-HT2BR, IC50= 3.4 nM) antagonist that causes selective vasodilation of pulmonary arteries.

PZM21 is a potent and selective μ opioid receptor agonist with an EC50 of 1.8 nM.

R15A inhibitor.

Ramelteon is a novel melatonin receptor agonist for human MT1 and MT2 receptors and chick forebrain melatonin receptors with Ki of 14 pM, 112 pM and 23.1 pM, respectively.

Ramosetron Hydrochloride(YM060 Hydrochloride) is a serotonin 5-HT3 receptor antagonist for the treatment of nausea and vomiting.

Reparixin(DF 1681Y) is an inhibitor of CXCL8 receptor, also inhibit CXCR1 and CXCR2 activation, which has been shown to attenuate inflammatory responses in various injury models.

RG7090(CTEP Derivative,Basimglurant, RO4917523) is a negative modulator of metabotropic glutamate receptor subtype 5 (mGluR5; GRM5).

Rimonabant Hcl(SR141716A) is a selective central cannabinoid (CB1) receptor inverse agonist with Ki of 1.8 nM.

Rimonabant(SR141716) is a selective central cannabinoid (CB1) receptor inverse agonist with Ki of 1.8 nM.

Risperidone(R 64 766) is a serotonin 5-HT2 receptor blocker(Ki= 0.16 nM) and a potent dopamine D2 receptor antagonist(Ki= 1.4 nM).

Rizatriptan Benzoate is a selective serotonin 5-HTID receptor agonist which is structurally derived from tryptamine.