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Loperamide (hydrochloride)

Loperamide (hydrochloride) (R-18553 (hydrochloride) ) is an opioid receptor agonist[1][2][3]. Loperamide hydrochloride is a selective and competitive human intestinal carboxylesterases (hiCE) inhibitor. Loperamide hydrochloride has anti-diarrheal effect[4].

Product Specifications

CAS Number

34552-83-5

Product Name Alternative

R-18553 (hydrochloride)

UNSPSC

12352005

Hazard Statement

H301

Target

Autophagy; Opioid Receptor

Type

Reference compound

Related Pathways

Autophagy; GPCR/G Protein; Neuronal Signaling

Applications

Metabolism-protein/nucleotide metabolism

Field of Research

Metabolic Disease; Neurological Disease; Cancer

Assay Protocol

https://www.medchemexpress.com/Loperamide-hydrochloride.html

Concentration

10mM

Purity

99.89

Solubility

DMSO : 43.75 mg/mL (ultrasonic; warming; heat to 60°C) |H2O : 1 mg/mL (ultrasonic)

Smiles

O=C(N(C)C)C(C1=CC=CC=C1)(C2=CC=CC=C2)CCN3CCC(O)(C4=CC=C(Cl)C=C4)CC3.Cl

Molecular Formula

C29H34Cl2N2O2

Molecular Weight

513.50

Precautions

H301

References & Citations

[1]Hanauer, S.B., The role of loperamide in gastrointestinal disorders. Rev Gastroenterol Disord, 2008. 8 (1) : p. 15-20.|[2]Litovitz, T., et al., Surveillance of loperamide ingestions: an analysis of 216 poison center reports. J Toxicol Clin Toxicol, 1997. 35 (1) : p. 11-9.|[3]http://www.drugs.com/mmx/loperamide-hydrochloride.html|[4]Hatfield MJ, et al. Carboxylesterase inhibitors. Expert Opin Ther Pat. 2011 Aug;21 (8) :1159-71.|[5]Svenja Zielke, et al. ATF4 links ER stress with reticulophagy in glioblastoma cells. Autophagy. 2021, 17, 9.

Shipping Conditions

Room Temperature

Storage Conditions

4°C (Powder, sealed storage, away from moisture)

Scientific Category

Reference compound1

Clinical Information

Launched

Citation 01

Cell Rep Methods. 2023 Oct 23;3 (10) :100599.|Dig Dis Sci. 2025 Nov 15.|eFood. 2025 Jul 14.|Food Qual Saf. 2024 Sep 10.|J Appl Microbiol. 2023 Aug 1;134 (8) :lxad153.|J Transl Med. 2021 Jul 23;19 (1) :317.|Viruses. 2021 Jun 28;13 (7) :1255.|Curr Med Sci. 2025 Aug 29.|Nature. 2025 Dec;648 (8094) :755-763.|Oncol Rep. 2025 Oct;54 (4) :133.|Phytomedicine. 2025 Oct 16:148:157417.

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