Compound 40 is a selective M1/M4 muscarinic antagonist with an IC50 of 19 nM for M1 receptors and 42 nM for M4 receptors [1].

Muscarinic toxin 7 (MT7) is a peptide exhibiting selective, noncompetitive antagonistic activity at the muscarinic M1 receptor [1].

Muscarinic toxin 3 (MT3), a potent non-competitive antagonist of mAChR and adrenoceptors, exhibits pIC50 values of 6.71 for M1, 8.79 for M4, 8.86 for α1A, 7.57 for α1B, 8.13 for α1D, 8.49 for α2A, <6.5 for α2B, and 7.29 for α2C receptors. MT3 notably demonstrates significant adrenoceptor activity [1].

Clozapine N-oxide is the major metabolite of Clozapine and is blood-brain barrier permeable. Clozapine N-oxide is an agonist of DREADDs and activates the DREADD receptors hM3Dq and hM4Di. Clozapine N-oxide is also a dopamine antagonist and selective muscarinic M4 receptor agonist.

Pilocarpine Hydrochloride (NSC 5746 HCl) , a nonselective muscarinic acetylcholine receptor agonist, is utilized to produce an experimental model of epilepsy.

Irsogladine (Dicloguamine) is an anti-gastric ulcer agent that facilitates gap-junctional intercellular communication through M1 muscarininc acetylcholine receptor binding.

Arecoline hydrobromide (Arecoline HBr) is a muscarinic acetylcholine receptor agonist.

Methacholine Chloride (Acetyl-β-methylcholine chloride) is a quaternary ammonium parasympathomimetic agent with the muscarinic actions of ACETYLCHOLINE. It is hydrolyzed by ACETYLCHOLINESTERASE at a considerably slower rate than ACETYLCHOLINE and is more resistant to hydrolysis by nonspecific CHOLINESTERASES so that its actions are more prolonged. It is used as a parasympathomimetic bronchoconstrictor agent and as a diagnostic aid for bronchial asthma.

Pilocarpine nitrate (Pilagan) is a slowly hydrolyzed muscarinic agonist with no nicotinic effects. Pilocarpine is used as a miotic and in the treatment of glaucoma.

L-Hyoscyamine sulfate (Levsin Sulfate) is the sulfate salt of a belladonna alkaloid derivative and the levorotatory form of racemic atropine isolated from the plants Hyoscyamus niger or Atropa belladonna, which exhibits anticholinergic activity. Hyoscyamine functions as a non-selective, competitive antagonist of muscarinic receptors, thereby inhibiting the parasympathetic activities of acetylcholine on the salivary, bronchial, and sweat glands, as well as the eye, heart, bladder, and gastrointestinal tract. These inhibitory effects cause a decrease in saliva, bronchial mucus, gastric juices, and sweat. Furthermore, its inhibitory action on smooth muscle prevents bladder contraction and decreases gastrointestinal motility.

Anisodamine Hydrobromide (6-Hydroxyhyoscyamine) is an anticholinergic and α1-adrenergic receptor antagonist used in the treatment of acute circulatory shock.

Darenzepine is a muscarinic receptor inhibitor.

Pimethixene (Calmixen) is a highly potent 5-HT1A, 5-HT2A, 5-HT2B, 5-HT2C, histamine H1, dopamine D2 and D4.4 as well as muscarinic M1 and M2 receptors antagonist(pKis of 7.63, 10.22, 10.44, 8.42, 10.14, 8.19, 7.54, 8.61 and 9.38, respectively).

Blarcamesine (AVex-73) is a muscarinic M1 agonist potentially for the treatment of Alzheimer's disease.

Prifinium bromide is a quaternary ammon antimuscarinic. It inhibits hyperkinesia of the digestive organs and urinary tract and has a spasmolytic action.

Cyclodrine (Cyclopent) is a cholinergic (muscarinic, nicotinic) (mAChR and nAChR) receptor antagonist.

Orphenadrine is a noncompetitive N-methyl-D-aspartate (NMDA) receptor antagonist that inhibits clonal HERG channels in a concentration-dependent manner, producing an IC of 0.85 μM in HEK cells.Orphenadrine is an antagonist of central and peripheral muscarinic receptors. Attenuation is blocked by mutations in pore residues Y652 or F656. Orphenadrine has antispasmodic, analgesic, and anticholinergic activity and protects against glutamatergic neurotoxicity in vitro and in vivo.Orphenadrine has inhibitory effects on sodium channels and can be used in the treatment of Parkinson's disease.

(±)-Tazifylline is a selective and long-acting antagonist of histamine H1 receptor. Tazifylline shows much lower affinity for H2 receptors, α- and β-adrenoceptors, 5-hydroxytryptamine and muscarinic receptor subtypes.

GSK233705 (Darotropium bromide) is a muscarinic receptor antagonist used in conjunction with the prevention and treatment of chronic obstructive pulmonary disease (COPD) and asthma in humans.

PF-03635659 is a potent and long dissociative half-life muscarinic M3 antagonist (Ki: 0.2 nM) that shows potential for the treatment of chronic obstructive pulmonary disease (COPD).

SCH 57790 is a novel and selective muscarinic M(2) receptor antagonist that releases acetylcholine and enhances cognition in experimental animals for the treatment of Alzheimer's disease.

WEB-1868 is one of the metabolites of nebracetam which is an agonist for human M1-muscarinic receptors.

Tampramine is a selective norepinephrine reuptake inhibitor that shows a low affinity for adrenergic, histaminergic and muscarinic receptors. Tampramine is a candidate compound for the treatment of forced swimming test (FST) depression.

(Rac)-VU 6008667 is a selective negative allosteric modulator of muscarinic acetylcholine receptor subtype 5 (M5 NAM) with IC50 of 1.8 μM and pIC50 of 5.75, has high CNS penetration.

Quinupramine (LM 208) is an orally available classical tricyclic antidepressant compound with a strong affinity for muscarinic and 5-HT receptors.Quinupramine crosses the central nervous system and can be used in the study of neurologic disorders.

G-Protein antagonist peptide acetate is a truncated substance P-related peptide, competes with receptor for G protein binding. G-Protein antagonist peptide acetate inhibits the activation of Gi or Go by M2 muscarinic cholinergic receptor (M2 mAChR) or of Gs by beta-adrenergic receptor in the reconstituted phospholipid vesicles, assayed by receptor-promoted GTP hydrolysis

DL-trihexyphenidyl hydrochloride (Trihexyphenidyl HCl) is a muscarinic antagonist.

Anisotropine Methylbromide is an anticholinergic agent and has been used for relief of gastrointestinal spasm and for the suppression of gastric acid secretion.

(Rac)-Sabcomeline ((Rac)-SB-202026) is an M1/M4 muscarinic agonist used in the study of neurologic disorders such as schizophrenia.

Afacifenacin (SMP-986) fumarate is an M3 muscarinic receptor-selective antagonist used in the study of ischemic heart disease, urinary incontinence and cystitis and other disorders.

mTOR/HDAC-IN-1 (Compound 50) is a dual inhibitor targeting both mTOR and HDAC with respective IC50 values of 0.49 nM and 0.91 nM. It holds potential as an anti-cancer agent [1].This compound is unstable in powder form and other related salt forms are recommended.

β2AR/M-receptor agonist-2 is a dual-function compound acting as a muscarinic antagonist and β2 adrenoceptor agonist (MABA). It demonstrates significant activity towards the β2 adrenoceptor with an EC50 of 3.7 nM and exhibits affinity for the human cloned M3 receptor with a Ki of 0.73 nM. This potent bronchodilator holds potential for research in chronic obstructive pulmonary disease (COPD) treatment.

AF-710B is a specific variant of M1 muscarinic and Sigma-1 receptor agonist used in the study of neurological disorders such as Alzheimer's disease dementia and schizophrenia.

5-A-RU (5-Amino-6-(D-ribitylamino)uracil), a precursor of bacterial Riboflavin, is a mucosal-associated invariant T (MAIT) cells activator. 5-A-RU forms potent MAIT-activating antigens via non-enzymatic reactions with small molecules that are derived from other metabolic pathways.This compound is unstable in powder form and other related salt forms are recommended.

PQCA is a muscarinic M1 receptor-positive allosteric regulator, which is highly selective and effective. PQCA exhibited EC50 values of 49 nM in rhesus monkey and 135 nM in human M1 receptors, but showed no activity against other muscarinic receptors. PQCA is a potential compound for reducing cognitive deficits associated with Alzheimer's disease.

Anisodamine (6-beta-Hydroxyhyoscyamine) is an antagonist of muscarinic and nicotinic cholinoceptor with similar affinities at the muscarinic receptor as scopolamine and atropine. Anisodamine improve the microcirculation in states of shock and can be used in studies about organophosphate poisoning.

Bencycloquidium Bromide is a muscarinic M3 antagonist. Bencycloquidium bromide inhibits nasal hypersecretion in a rat model of allergic rhinitis. Bencycloquidium Bromide showed high affinity toward the M(3) receptor in Chinese hamster ovary (CHO) cells (M(1) pKi=7.86, M(2) pKi=7.21, M(3) pKi=8.21); pA(2)=8.85, 8.71 and 8.57 in methacholine-induced contraction of trachea, ileum and urinary bladder, 8.19 in methacholine-induced bradycardia of right atrium in vitro, respectively.This compound is unstable in powder form and other related salt forms are recommended.

Atropine (DL-Hyoscyamine) Sulfate is the sulfate salt of atropine, a naturally-occurring alkaloid isolated from the plant Atropa belladonna. Atropine functions as a sympathetic, competitive antagonist of muscarinic cholinergic receptors, thereby abolishing the effects of parasympathetic stimulation.

Pirenzepine dihydrochloride (LS519) is a selective M1 muscarinic receptor antagonist, inhibiting gastric secretion.

Cyclopentolate Hydrochloride is a muscarinic acetylcholine receptors antagonist with Kis of 1.62, 27.5, and 2.63 nM for M1, M2, and M3 receptors, respectively.

Clozapine N-oxide dihydrochloride is a derivative of Clozapine and an agonist of human muscarinic design receptors (DREADDs) that crosses the blood-brain barrier.Clozapine N-oxide dihydrochloride induces activation of DREADD receptors hM3Dq and hM4Di. Clozapine N-oxide dihydrochloride induces activation of DREADD receptors hM3Dq and hM4Di.

Pteropodine acts as a positive modulator of muscarinic M(1) and 5-HT(2) receptors. Pteropodine shows antigenotoxic, antioxidant and lymphocyte induction effects, it also shows strong apoptotic effect on acute leukaemic lymphoblasts.

Methylbenactyzium Bromide (Semulgin) is an anticonvulsant that is the active metabolite of trimethadione.

Atropine methyl bromide (Methylatropine bromide) is a quaternary ammonium salt of atropine, characterized as a muscarinic receptor (mAChR) antagonist. It functions as a mydriatic to dilate the pupil during ophthalmic examination. Compared to atropine, it demonstrates reduced penetration into the central nervous system[1][2]. Its high polarity makes it particularly effective in relieving pyloric spasm in infants.

Arborine (Arborin) is a larval growth inhibitor from glycoslnis pentaphylla.

CDD0102 HCl is a selective and potent M1 muscarinic receptor agonist for the treatment of Alzheimer's disease.

Substance P analog that inhibits activation of Gq/11 by M1 muscarinic ACh receptors. Does not inhibit Gi/o activation by M2 ACh receptors.

VU0238441 is agonist of Muscarinic acetylcholine receptor M5 (human) with EC50 of 2.1μM.

mAChR-IN-1 hydrochloride is a potent muscarinic cholinergic receptor (mAChR) antagonist, with an IC50 of 17 Nm.

LAS190792 (AZD8999) is a dual-action chemical compound that simultaneously acts as a strong muscarinic antagonist and β2-adrenoceptor agonist. It exhibits significant potency across a range of receptors, with pIC50 values of 8.9 for M1, 8.8 for M2, 8.8 for M3, 9.2 for M4, 8.2 for M5, 7.5 for β1, 9.1 for β2, and 5.6 for β3. Its effectiveness across these receptors makes LAS190792 a viable candidate for bronchodilator applications [1].