Quinidine (15% dihydroquinidine)

Name: Quinidine (15% dihydroquinidine)
Brand: MedChemExpress
SKU: HY-B1751
Rating: 5.0 (24 reviews)

Cat. No.: HY-B1751 Purity: 98.36%: Data Sheet
COA

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Quinidine (15% dihydroquinidine) is an antiarrhythmic agent. Quinidine is a potent, orally active, selective cytochrome P450db inhibitor. Quinidine is also a K⁺ channel blocker with an IC₅₀ of 19.9 μM, and can induce apoptosis. Quinidine can be used for malaria research.

For research use only. We do not sell to patients.

CAS No. : 56-54-2

Size	Stock	Quantity
100 mg	In-stock	Estimated Time of Arrival: December 31
500 mg	In-stock	Estimated Time of Arrival: December 31
1 g	In-stock	Estimated Time of Arrival: December 31
5 g	In-stock	Estimated Time of Arrival: December 31
10 g	In-stock	Estimated Time of Arrival: December 31
25 g	In-stock	Estimated Time of Arrival: December 31
50 g	In-stock	Estimated Time of Arrival: December 31
100 g	In-stock	Estimated Time of Arrival: December 31
> 100 g	Get quote

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Customer Review

Based on 24 publication(s) in Google Scholar

Other Forms of Quinidine (15% dihydroquinidine):

Quinidine hydrochloride monohydrate In-stock
Quinidine-d₃ Get quote
Quinidine-¹³C, d₂ hydrochloride Get quote
Quinidine sulfate Get quote
Quinidine sulfate dihydrate Get quote
Quinidine polygalacturonate Get quote
Quinidine gluconic acid Get quote
Quinidine (15% dihydroquinidine) (Standard) Get quote

24 Publications Citing Use of MCE Quinidine (15% dihydroquinidine)

Flow Cytometry

Bio/Physico-chemical Assay

RT-PCR

: Quinidine (15% dihydroquinidine) purchased from MedChemExpress. Usage Cited in: Adv Sci (Weinh). 2025 Aug 19:e05666. [Abstract]; Quinidine rescued [Mg^2⁺]_i levels in LPS‐treated or TRPM7‐silenced DPSCs and SCAP.

: Quinidine (15% dihydroquinidine) purchased from MedChemExpress. Usage Cited in: J Hazard Mater. 2021 Aug 15:416:125764. [Abstract]; Effects of CYP enzymes inhibitors on metabolic rates of cyproconazole stereoisomers in the in vitro incubation mixtures with RLMs. The asterisks (*) indicates the significant difference in metabolic rates under inhibition compared to the control.

: Quinidine (15% dihydroquinidine) purchased from MedChemExpress. Usage Cited in: Front Pharmacol. 2020 Jul 31;11:1038. [Abstract]; Cell cycle relative proteins/genes (CyclinD1, CDK4, P21 and P27) level were assessed in HConFs after Quinidine treatment by western blot.

: Quinidine (15% dihydroquinidine) purchased from MedChemExpress. Usage Cited in: Front Pharmacol. 2020 Jul 31;11:1038. [Abstract]; Cell cycle relative proteins/genes (CyclinD1, CDK4, P21 and P27) level were assessed in HConFs after Atropine/Quinidine treatment by qRT-PCR.

: Quinidine (15% dihydroquinidine) purchased from MedChemExpress. Usage Cited in: Environ Int. 2019 Jun;127:694-703. [Abstract]; CYP2D6 has contributed in the enantioselectivity of IFP and ICPO because the EF value of the KND-supplemented group follows a doseeffect relationship and the difference in the EF values was over 10% relative to the DMSO control group.

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Biological Activity
Purity & Documentation
References
Customer Review

Description

IC₅₀ & Target

Plasmodium

Cellular Effect

Cell Line	Type	Value	Description	References
CHO	IC₅₀	2.67 μM Compound: Quinidine	Inhibition of human ERG expressed in CHO cells by patch plate method Inhibition of human ERG expressed in CHO cells by patch plate method	[PMID: 26640981]
CHO	IC₅₀	6.4 μM Compound: quinidine	Inhibition of Cav1.2 current measured using QPatch automatic path clamp system in CHO cells expressing Cav1.2, beta-2 and alpha-2/delta-1 subunits Inhibition of Cav1.2 current measured using QPatch automatic path clamp system in CHO cells expressing Cav1.2, beta-2 and alpha-2/delta-1 subunits	[PMID: 23812503]
Caco-2	IC₅₀	2.2 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of Digoxin transepithelial transport (basal to apical) (Digoxin: 5 uM) in Caco-2 cells TP_TRANSPORTER: inhibition of Digoxin transepithelial transport (basal to apical) (Digoxin: 5 uM) in Caco-2 cells	[PMID: 10820137]
HEK293	IC₅₀	11.2 μM Compound: quinidine	Inhibition of human MATE1-mediated ASP+ uptake expressed in HEK293 cells after 1.5 mins by fluorescence assay Inhibition of human MATE1-mediated ASP+ uptake expressed in HEK293 cells after 1.5 mins by fluorescence assay	[PMID: 23241029]
HEK293	IC₅₀	113.8 μM Compound: quinidine	Inhibition of 4-(4-(dimethylamino)styryl)-N-methylpyridinium uptake at human OCT1 expressed in HEK293 cells by confocal microscopy Inhibition of 4-(4-(dimethylamino)styryl)-N-methylpyridinium uptake at human OCT1 expressed in HEK293 cells by confocal microscopy	[PMID: 18788725]
HEK293	IC₅₀	16600 nM Compound: Quinidine	Inhibition of sodium current measured using whole-cell patch clamp experiments in HEK-293 cells stably transfected with hNaV1.5 cDNA Inhibition of sodium current measured using whole-cell patch clamp experiments in HEK-293 cells stably transfected with hNaV1.5 cDNA	[PMID: 21300721]
HEK293	IC₅₀	19.82 μM Compound: Quinidine	Inhibition of L-type calcium channel measured using 2-electrode voltage-clamp in human embryonic kidney cells heterologically expressing alpha-1C subunit Inhibition of L-type calcium channel measured using 2-electrode voltage-clamp in human embryonic kidney cells heterologically expressing alpha-1C subunit	[PMID: 22761000]
HeLa	IC₅₀	23.4 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of TEA uptake (TEA: 10 uM) in OCT1-expressing HeLa cells TP_TRANSPORTER: inhibition of TEA uptake (TEA: 10 uM) in OCT1-expressing HeLa cells	[PMID: 10027858]
Hepatocyte	IC₅₀	240 μM Compound: 14 Quinidine	Inhibition of apamin-sensitive SKCa channel of guinea-pig hepatocytes Inhibition of apamin-sensitive SKCa channel of guinea-pig hepatocytes	[PMID: 15225721]
Huh-7	CC₅₀	50.75 μM Compound: GNF-Pf-5459	NOVARTIS: Cytotoxicity against human hepatocellular carcinoma cell line (Huh7) NOVARTIS: Cytotoxicity against human hepatocellular carcinoma cell line (Huh7)	[PMID: 18579783]
LLC-PK1	IC₅₀	10 μM Compound: Quinidine	Inhibition of P-glycoprotein, mouse L-mdr1b expressed in LLC-PK1 epithelial cells using calcein-AM polarisation assay Inhibition of P-glycoprotein, mouse L-mdr1b expressed in LLC-PK1 epithelial cells using calcein-AM polarisation assay	[PMID: 12699389]
LLC-PK1	IC₅₀	10 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of Calcein-AM efflux in Mdr1b-expressing LLC-PK1 cells TP_TRANSPORTER: inhibition of Calcein-AM efflux in Mdr1b-expressing LLC-PK1 cells	[PMID: 12699389]
LLC-PK1	IC₅₀	13 μM Compound: Quinidine	Inhibition of P-glycoprotein, mouse L-mdr1a expressed in LLC-PK1 epithelial cells using calcein-AM polarisation assay Inhibition of P-glycoprotein, mouse L-mdr1a expressed in LLC-PK1 epithelial cells using calcein-AM polarisation assay	[PMID: 12699389]
LLC-PK1	IC₅₀	13 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of Calcein-AM efflux in Mdr1a-expressing LLC-PK1 cells TP_TRANSPORTER: inhibition of Calcein-AM efflux in Mdr1a-expressing LLC-PK1 cells	[PMID: 12699389]
LLC-PK1	IC₅₀	5.6 μM Compound: Quinidine	Inhibition of P-glycoprotein, human L-MDR1 expressed in LLC-PK1 epithelial cells using calcein-AM polarisation assay Inhibition of P-glycoprotein, human L-MDR1 expressed in LLC-PK1 epithelial cells using calcein-AM polarisation assay	[PMID: 12699389]
LLC-PK1	IC₅₀	5.6 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of Calcein-AM efflux in MDR1-expressing LLC-PK1 cells TP_TRANSPORTER: inhibition of Calcein-AM efflux in MDR1-expressing LLC-PK1 cells	[PMID: 12699389]
NIH-3T3-G185	IC₅₀	1 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of LDS-751 efflux in NIH-3T3-G185 cells TP_TRANSPORTER: inhibition of LDS-751 efflux in NIH-3T3-G185 cells	[PMID: 11716514]
NIH-3T3-G185	IC₅₀	18.8 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of Daunorubicin efflux in NIH-3T3-G185 cells TP_TRANSPORTER: inhibition of Daunorubicin efflux in NIH-3T3-G185 cells	[PMID: 11716514]
NIH-3T3-G185	IC₅₀	33.9 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of Rhodamine 123 efflux in NIH-3T3-G185 cells TP_TRANSPORTER: inhibition of Rhodamine 123 efflux in NIH-3T3-G185 cells	[PMID: 11716514]
Oocyte	IC₅₀	12.7 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of TEA uptake (TEA: 10 uM) in Xenopus laevis oocytes TP_TRANSPORTER: inhibition of TEA uptake (TEA: 10 uM) in Xenopus laevis oocytes	[PMID: 11502595]
Oocyte	IC₅₀	14.6 μM Compound: Quinidine	TP_TRANSPORTER: inhibition of TEA uptake (TEA: 10 uM) in Xenopus laevis oocytes TP_TRANSPORTER: inhibition of TEA uptake (TEA: 10 uM) in Xenopus laevis oocytes	[PMID: 11502595]
ScN2a	IC₅₀	5 μM Compound: quinidine	Antiprion activity in ScN2a cells assessed as inhibition of protease-resistant prion protein accumulation Antiprion activity in ScN2a cells assessed as inhibition of protease-resistant prion protein accumulation	[PMID: 17850126]
Ventricular myocyte	IC₅₀	10 μM Compound: Quinidine	Inhibition of L-type calcium channel measured using whole-cell patch clamp in rat ventricular myocytes Inhibition of L-type calcium channel measured using whole-cell patch clamp in rat ventricular myocytes	[PMID: 22761000]
Ventricular myocyte	IC₅₀	15.6 μM Compound: Quinidine	Inhibition of L-type calcium channel measured using whole-cell patch clamp in guinea pig ventricular myocytes Inhibition of L-type calcium channel measured using whole-cell patch clamp in guinea pig ventricular myocytes	[PMID: 22761000]
Ventricular myocyte	IC₅₀	15600 nM Compound: Quinidine	Inhibition of calcium current (ICaL) measured using whole-cell patch clamp experiments in isolated guinea pig ventricular myocytes Inhibition of calcium current (ICaL) measured using whole-cell patch clamp experiments in isolated guinea pig ventricular myocytes	[PMID: 21300721]
WI-38	IC₅₀	11.28 μg/mL Compound: 1b	Cytotoxicity against human WI38 cells by MTT assay Cytotoxicity against human WI38 cells by MTT assay	[PMID: 23816880]
WI-38	IC₅₀	34.81 μM Compound: QND	Cytotoxicity against human WI38 cells by MTT assay Cytotoxicity against human WI38 cells by MTT assay	[PMID: 26063305]

In Vitro

Quinidine shows cytotoxicity against MES-SA cells, and induces apoptosis^[4].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Cell Cytotoxicity Assay^[4]

Cell Line:	MES-SA and MESSA/DX5 cells
Concentration:	10 μM
Incubation Time:	24 hours
Result:	Showed cytotoxicity against MES-SA cells in a concentration-dependent manner.

Apoptosis Analysis^[4]

Cell Line:	MES-SA and MESSA/DX5 cells
Concentration:	10 μM
Incubation Time:	24 hours
Result:	Increased the apoptotic portion sub-G1 DNA contents induced by paclitaxel, while paclitaxel had no effect on sub-G1 DNA contents undergoing apoptosis.

In Vivo

Quinidine shows effects on the PTZ-induced seizure threshold^[5].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Model:	Male mice of the NMRI strain (age 5-6 weeks and weight 25-30 g)^[5
Dosage:	10, 20, and 30 mg/kg
Administration:	Intraperitoneal injection; 10, 20, and 30 mg/kg; once
Result:	Increased the threshold dose for the onset to tonic hind limb extension at a dose of 30 mg/kg, compared to the saline-treated control group (p<0.05).

Molecular Weight

324.42

Formula

C₂₀H₂₄N₂O₂

CAS No.

56-54-2

Appearance

Solid

Color

White to off-white

SMILES

C=C[C@H]1C[N@](CC[C@H]1C2)[C@@]2([H])[C@@H](O)C3=CC=NC4=CC=C(OC)C=C34

Structure Classification

Initial Source

Shipping

Room temperature in continental US; may vary elsewhere.

Storage

4°C, protect from light, stored under nitrogen

*In solvent : -80°C, 1 year; -20°C, 6 months (protect from light, stored under nitrogen)

Solvent & Solubility

In Vitro:

DMSO : ≥ 50 mg/mL (154.12 mM; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

Ethanol : 14.29 mg/mL (44.05 mM; ultrasonic and warming and heat to 60°C)

H₂O : < 0.1 mg/mL (insoluble)

*"≥" means soluble, but saturation unknown.

Preparing
Stock Solutions

Concentration Solvent Mass	1 mg	5 mg	10 mg

1 mM	3.0824 mL	15.4121 mL	30.8242 mL
5 mM	0.6165 mL	3.0824 mL	6.1648 mL
10 mM	0.3082 mL	1.5412 mL	3.0824 mL

View the Complete Stock Solution Preparation Table

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 1 year; -20°C, 6 months (protect from light, stored under nitrogen). When stored at -80°C, please use it within 1 year. When stored at -20°C, please use it within 6 months.

Molarity Calculator
Dilution Calculator

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Concentration _(start) × Volume _(start) = Concentration _(final) × Volume _(final)

This equation is commonly abbreviated as: C₁V₁ = C₂V₂

Concentration _(start)

Volume _(start)

Concentration _(final)

Volume _(final)

In Vivo:

Select the appropriate dissolution method based on your experimental animal and administration route.

For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for in vivo experiments, it is recommended to prepare freshly and use it on the same day.
The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.

Protocol 1

Add each solvent one by one: 10% DMSO 40% PEG300 5% Tween-80 45% Saline
Solubility: ≥ 2.5 mg/mL (7.71 mM); Clear solution

This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown).
Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 mg/mL) to 400 μL PEG300, and mix evenly; then add 50 μL Tween-80 and mix evenly; then add 450 μL Saline to adjust the volume to 1 mL.
Preparation of Saline: Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution.
Protocol 2

Add each solvent one by one: 10% DMSO 90% (20% SBE-β-CD in Saline)
Solubility: ≥ 2.5 mg/mL (7.71 mM); Clear solution

This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown).
Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 mg/mL) to 900 μL 20% SBE-β-CD in Saline, and mix evenly.
Preparation of 20% SBE-β-CD in Saline (4°C, storage for one week): 2 g SBE-β-CD powder is dissolved in 10 mL Saline, completely dissolve until clear.
Protocol 3

Add each solvent one by one: 10% DMSO 90% Corn Oil
Solubility: ≥ 2.5 mg/mL (7.71 mM); Clear solution

This protocol yields a clear solution of ≥ 2.5 mg/mL (saturation unknown). If the continuous dosing period exceeds half a month, please choose this protocol carefully.
Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 mg/mL) to 900 μL Corn oil, and mix evenly.

In Vivo Dissolution Calculator

Please enter the basic information of animal experiments:

Dosage

mg/kg

Animal weight
(per animal)

Dosing volume
(per animal)

μL

Number of animals

Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.

Please enter your animal formula composition:

DMSO +

Tween-80 +

Saline

Recommended: Keep the proportion of DMSO in working solution below 2% if your animal is weak.

The co-solvents required include: DMSO, . All of co-solvents are available by MedChemExpress (MCE). , Tween 80. All of co-solvents are available by MedChemExpress (MCE).

Calculation results:

Working solution concentration: mg/mL

Method for preparing stock solution: mg drug dissolved in μL DMSO (Stock solution concentration: mg/mL).

*In solvent : -80°C, 1 year; -20°C, 6 months (protect from light, stored under nitrogen)

The concentration of the stock solution you require exceeds the measured solubility. The following solution is for reference only. If necessary, please contact MedChemExpress (MCE).

Method for preparing in vivo working solution for animal experiments: Take μL DMSO stock solution, add μL . μL , mix evenly, next add μL Tween 80, mix evenly, then add μL Saline.

If the continuous dosing period exceeds half a month, please choose this protocol carefully.

Please ensure that the stock solution in the first step is dissolved to a clear state, and add co-solvents in sequence. You can use ultrasonic heating (ultrasonic cleaner, recommended frequency 20-40 kHz), vortexing, etc. to assist dissolution.

Purity & Documentation

Purity: 98.36%

Select Batch:

Data Sheet (286 KB) SDS (481 KB)

COA (257 KB) HNMR (288 KB) LCMS (98 KB)

Handling Instructions (2659 KB)

References

[1]. Kehl SJ, et al. Quinidine-induced inhibition of the fast transient outward K+ current in rat melanotrophs. Br J Pharmacol. 1991 Jul;103(3):1807-13. [Content Brief]

[2]. Roden DM, et al. Class I antiarrhythmic agents: quinidine, procainamide and N-acetylprocainamide, disopyramide. [Content Brief]

[3]. Moody DE, et al. Quinidine inhibits in vivo metabolism of amphetamine in rats: impact upon correlation between GC/MS and immunoassay findings in rat urine. J Anal Toxicol. 1990 Sep-Oct;14(5):311-7. [Content Brief]

[4]. Sang-Yun Lee, et al. Hydrocinchonine, cinchonine, and quinidine potentiate paclitaxel-induced cytotoxicity and apoptosis via multidrug resistance reversal in MES-SA/DX5 uterine sarcoma cells. Environ Toxicol. 2011 Aug;26(4):424-31. [Content Brief]

[5]. Hassan Jamali, et al. Effect of dextromethorphan/quinidine on pentylenetetrazole- induced clonic and tonic seizure thresholds in mice. Neurosci Lett. 2020 Jun 11;729:134988. [Content Brief]

Complete Stock Solution Preparation Table

Optional Solvent	Concentration Solvent Mass	1 mg	5 mg	10 mg	25 mg

Ethanol / DMSO	1 mM	3.0824 mL	15.4121 mL	30.8242 mL	77.0606 mL
	5 mM	0.6165 mL	3.0824 mL	6.1648 mL	15.4121 mL
	10 mM	0.3082 mL	1.5412 mL	3.0824 mL	7.7061 mL
	15 mM	0.2055 mL	1.0275 mL	2.0549 mL	5.1374 mL
	20 mM	0.1541 mL	0.7706 mL	1.5412 mL	3.8530 mL
	25 mM	0.1233 mL	0.6165 mL	1.2330 mL	3.0824 mL
	30 mM	0.1027 mL	0.5137 mL	1.0275 mL	2.5687 mL
	40 mM	0.0771 mL	0.3853 mL	0.7706 mL	1.9265 mL
DMSO	50 mM	0.0616 mL	0.3082 mL	0.6165 mL	1.5412 mL
	60 mM	0.0514 mL	0.2569 mL	0.5137 mL	1.2843 mL
	80 mM	0.0385 mL	0.1927 mL	0.3853 mL	0.9633 mL
	100 mM	0.0308 mL	0.1541 mL	0.3082 mL	0.7706 mL