MK-6892 is a highly potential GPR109A agonist with Ki value of 4.0 nM.

MK-3697 is a third insomnia drug, currently being developed by Merck. MK-3697 is a potent and selective Orexin receptor antagonist with Ki = 0.95 nM.

MK-3207 is a potent and orally bioavailable CGRP receptor antagonist (IC50= 0.12 nM; Ki value= 0.024 nM); highly selective versus human AM1, AM2, CTR, and AMY3.

MK-2894 is a highly potent and selective second generation EP4 antagonist.

MK-0974(Telcagepant) is a highly potent, selective, and orally bioavailable CGRP receptor antagonist with Ki values of 0.77 nM and 1.2 nM for human and rhesus CGRP receptors respectively; displays >1500-fold lower affinity for the canine and rat receptors

MK-0812 is chemokine receptor CCR-2 antagonist

MK-0354 is a partial agonist of GPR109a receptor, for hGPR109a/ mGPR109a with EC50 of 1.65/1.08 μM, showed no activation of GPR109b.

Mizolastine is a histamine H1-receptor antagonist with IC50 of 47 nM used in the treatment of hay fever (seasonal allergic rhinitis), hives and other allergic reactions.

Minesapride (DSP-6952) is a novel potent, selective, orally active 5-HT4 receptor partial agonist with Ki of 50-100 nM for human 5-HT4a/4b/4c.

MF498 is a novel and selective E prostanoid receptor 4 (EP4) inhibitor, relieves joint inflammation and pain in rodent models of rheumatoid and osteoarthritis.

Metoprolol is a cardioselective β1-adrenergic blocking agent.

Mequitazine is a potent, nonsedative and long-acting histamine H1 antagonist.

Medetomidine hydrochloride is a potent and highly selective α2-AR adrenoceptor agonist (Ki values are 1.08 and 1750 nM for α2- and α1-adrenoceptors respectively). Shows greater selectivity over α1-adrenoceptors than clonidine and UK 14,304 (1620-, 220- an

Meclizine is a histamine H1 receptor antagonist used to treat nausea and motion sickness.

Maropitant is a neurokinin (NK1) receptor antagonist.

LY354740 is an agonist of the group II metabotropic glutamate receptor (mGluR) subtypes mGluR2 and mGluR3 (Kis = 99 and 94 nM, respectively).

LY344864 is a selective receptor agonist with an affinity of 6 nM (Ki) at the recently cloned 5-HT1F receptor.

LY2922470 (LY-2922470) is a potent, selective, orally available GPR40 agonist with EC50 of 7 nM.

LY2510924 is an inhibitor of CXC chemokine receptor 4 (CXCR4), with potential antineoplastic activity.

Lurasidone is a novel psychotropic agent that has been shown in studies of cloned human receptors to be an antagonist at the 5-HT2A receptor.

Losartan is a potent, non peptide antagonist of the angiotensin II receptor type 1. This receptor initiates a signal cascade that causes vasoconstriction. Antagonism of this receptor in turn causes vasodilation by blocking the signal from angiotensin II.

Loratadine(SCH-29851) is a selective inverse peripheral histamine H1-receptor agonist with an IC50 of >32 μM.

LMD-A (CCR8 antagonist LMD-A) is a highly potent, small molecule antagonist of chemokine receptor CCR8 with EC50 of 2.5 nM.

Levodropropizine is a histamine receptor inhibitor, Levodropropizine is an effective and very well tolerated peripheral antitussive drug.

Lamotrigine(BW430C) is a novel anticonvulsant drug for inhibition of 5-HT and sodium channel.

L-826,266 is a potent and selective competitive antagonist of the prostaglandin E2 receptor subtype EP3 (Ki = 0.8 nM).

L-(-)-α-Methyldopa hydrate is an alpha-adrenergic agonist (selective for α2-adrenergic receptors) psychoactive drug used as a sympatholytic or antihypertensive.

Ketotifen (fumarate) is a second-generation noncompetitive H1-antihistamine and mast cell stabilizer, which is used to prevent asthma attacks.

JDTic 2Hcl is a highly selective antagonist for the κ-opioid receptor; without affecting the μ- or δ-opioid receptors.

IT1t is a potent CXCR4 antagonist; inhibits CXCL12/CXCR4 interaction with an IC50 of 2.1 nM.