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  4. Yohimbine


Cat. No.: HY-12715 Purity: 99.91%
COA Handling Instructions

Yohimbine is a potent and relatively nonselective alpha 2-adrenergic receptor (AR) antagonist, with IC50 of 0.

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

Yohimbine Chemical Structure

Yohimbine Chemical Structure

CAS No. : 146-48-5

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Customer Review

Based on 10 publication(s) in Google Scholar

Other Forms of Yohimbine:

Top Publications Citing Use of Products

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  • Biological Activity

  • Purity & Documentation

  • References

  • Customer Review


Yohimbine is a potent and relatively nonselective alpha 2-adrenergic receptor (AR) antagonist, with IC50 of 0.6 μM. IC50 value: 0.6 uM [1] Target: alpha 2-adrenergic receptor in vitro: Yohimbine inhibits alpha2-receptor antagonist with Ki of 1.05 nM, 1.19 nM, and 1.19 nM for α2A, α2B, α2C, respectively. Yohimbine also inhibits 5-HT1B with Ki of 19.9 nM. Yohimbine acts to block the lowering of cAMP by alpha-2 adrenoceptor agonists. yohimbine actually causes a pronounced lowering of tyrosinase activity. [3] in vivo: Yohimbine is an antagonist at alpha2-noradrenaline receptors with putative panicogenic effects in human subjects, was administered to Swiss-Webster mice at doses of 0.5, 1.0, and 2.0 mg/kg. Yohimbine potentiates active defensive responses to threatening stimuli in Swiss-Webster mice.[2]

IC50 & Target

α adrenergic receptor


In Vivo

Yohimbine can be used in animal modeling to construct models of neurological symptoms, hypertension, and cardiac enhancement.

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

Clinical Trial
Molecular Weight







White to yellow



Structure Classification
Initial Source

Room temperature in continental US; may vary elsewhere.

Powder -20°C 3 years
4°C 2 years
In solvent -80°C 1 year
-20°C 6 months
Solvent & Solubility
In Vitro: 

DMSO : 5 mg/mL (14.11 mM; Need ultrasonic)

H2O : 1 mg/mL (2.82 mM; ultrasonic and warming and heat to 80°C)

Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 2.8214 mL 14.1068 mL 28.2135 mL
5 mM 0.5643 mL 2.8214 mL 5.6427 mL
10 mM 0.2821 mL 1.4107 mL 2.8214 mL
*Please refer to the solubility information to select the appropriate solvent.
In Vivo:
  • 1.

    Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% Saline

    Solubility: ≥ 0.5 mg/mL (1.41 mM); Clear solution

  • 2.

    Add each solvent one by one:  10% DMSO    90% (20% SBE-β-CD in Saline)

    Solubility: ≥ 0.5 mg/mL (1.41 mM); Clear solution

  • 3.

    Add each solvent one by one:  10% DMSO    90% Corn Oil

    Solubility: ≥ 0.5 mg/mL (1.41 mM); Clear solution

*All of the co-solvents are available by MedChemExpress (MCE).
Purity & Documentation
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Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

  • Molarity Calculator

  • Dilution Calculator

The molarity calculator equation

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

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The dilution calculator equation

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

This equation is commonly abbreviated as: C1V1 = C2V2

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
× = ×
C1   V1   C2   V2

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