Nebracetam hydrochloride, a nootropic M1-muscarinic agonist, induces a rise of intracellular Ca2+ concentration. Nebracetam hydrochloride exhibits an EC50 of 1.59 mM for elevating [Ca2+]i.

Otenzepad (AF-DX 116) is a selective and competitive M2 muscarinic acetylcholine receptor antagonist, with IC50 values of 640 nM and 386 nM for rabbit peripheral lung and rat heart, respectively.

Xanomeline(LY246708) is a selective M1 muscarinic receptor agonist.

VU6004256 (VU 6004256) is a highly potent, selective M1 muscarinic acetylcholine receptor (mAChR) positive allosteric modulator with EC50 of 155 nM (mouse M1), significant selectivity over M2-M5 (EC50>30 uM).

VU0467154 (VU 0467154) is a potent, selective M4 mAChR positive allosteric modulator with EC50 of 17.7 nM.

VU0453595 (VU453595) is a potent, selective M1 positive allosteric modulator (PAM) with EC50 of 3.2 uM (rM1).

Tolterodine L-Tartrate is a muscarinic receptor antagonist that is active at all mAChR M subtypes. This compound blocks the opening of ion channels by acetylcholine, which in turn leads to muscle relaxation by blocking neuronal signaling.

PF-06827443 (PF06827443) is a potent, orally bioavailable, and CNS-penetrant M1-selective positive allosteric modulator (PAM) with EC50 of 47 nM, shows no activity against M2-M5 at 10 uM.

PF-06764427 (PF06764427) is a potent, selective M1 muscarinic acetylcholine receptor (mAChR) positive allosteric modulator with EC50 of 55 nM, has no measurable agonist or PAM activity at the M2-M5 receptors at 10 uM.

AC260584 is an M1 muscarinic receptor allosteric agonist with a pEC50 of 7.6.