1. Metabolic Enzyme/Protease
  2. Phosphodiesterase (PDE)
  3. Milrinone

Milrinone  (Synonyms: Win 47203)

Cat. No.: HY-14252 Purity: 99.87%
COA Handling Instructions

Milrinone is a PDE3 inhibitor, and also an inotrope and vasodilator.

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

Milrinone Chemical Structure

Milrinone Chemical Structure

CAS No. : 78415-72-2

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10 mM * 1 mL in DMSO USD 73 In-stock
Estimated Time of Arrival: December 31
Solid + Solvent
10 mM * 1 mL
ready for reconstitution
USD 73 In-stock
Estimated Time of Arrival: December 31
50 mg USD 66 In-stock
Estimated Time of Arrival: December 31
100 mg USD 105 In-stock
Estimated Time of Arrival: December 31
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Customer Review

Based on 16 publication(s) in Google Scholar

Other Forms of Milrinone:

Top Publications Citing Use of Products
  • Biological Activity

  • Protocol

  • Purity & Documentation

  • References

  • Customer Review


Milrinone is a PDE3 inhibitor, and also an inotrope and vasodilator.

In Vitro

Milrinone (1 µM) increases PKA activity in hypoxic myocytes to normoxic levels. Milrinone (50 nM) normalizes TP receptor sensitivity in hypoxic myocytes by restoring PKA-mediated regulatory TP receptor phosphorylation[1]. Milrinone significantly reduces NE-induced vasoconstriction, attenuating both NE sensitivity and maximal tension generation. Inhibition of ATP-sensitive K+ channels or voltage-gated K+ channels do not prevent the milrinone-induced attenuation of NE responses[4].

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

In Vivo

Milrinone (1 μg/kg/min, i.v.) significantly reduces PAP, PVR (−18.96 ± 1.7%), and LAP (−26.03 ± 2.3%) in congestive heart failure (CHF) rats. Milrinone (1 mg/mL, inhalation) results in a near-maximal reduction of PAP without significant effects on AP, decreases pulmonary artery pressure similarly in a larger collective of CHF rats. Milrinone inhalation selectively increases cAMP but not cGMP plasma concentrations in both groups. Repeated milrinone inhalations even reduce lung wet/dry weight ratio[2]. Milrinone (49.5 μg) largely shifts the ESPVR upwards and significantly increases end-systolic pressure (ESP(0.08)) and the systolic pressure-volume area (PVA(0.08)) at a mid-range LV volume (0.08 mL/g myocardium). Milrinone also slightly decreases LV ESP(ESV) and decreased Ea[3].

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

Clinical Trial
Molecular Weight









Room temperature in continental US; may vary elsewhere.

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

DMSO : 50 mg/mL (236.72 mM; Need ultrasonic)

Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 4.7344 mL 23.6720 mL 47.3440 mL
5 mM 0.9469 mL 4.7344 mL 9.4688 mL
10 mM 0.4734 mL 2.3672 mL 4.7344 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: ≥ 2.75 mg/mL (13.02 mM); Clear solution

  • 2.

    Add each solvent one by one:  10% DMSO    90% corn oil

    Solubility: ≥ 2.75 mg/mL (13.02 mM); Clear solution

*All of the co-solvents are available by MCE.
Purity & Documentation

Purity: 99.87%

Animal Administration

In juvenile rats of 100 ± 8 g body weight (bw), CHF is induced by supracoronary aortic banding. In brief, rats are anesthetized by intraperitoneal injection of ketamine (87 mg/kg bw) and xylazine (13 mg/kg bw). Rats are placed in the supine position, the chest wall is shaved, and a left thoracotomy is performed in the third intercostal space during ventilation with 100% O2. The ascending aorta is freed from connective tissue and partially occluded by implantation of a titanium clip with a defined internal diameter of 0.8 mm. After surgical closure of the thorax, the rats are allowed to recover from anesthesia. For postoperative analgesia, rats receive 250 mg/kg bw of metamizole intramuscularly immediately after the operation and on the first postoperative day. Sham-operated rats serve as controls. After recovery from anesthesia, the animals are placed in cages with free access to water and standard laboratory diet. For inhalation, milrinone (0.2-5 mg/mL) or NaCl (0.9%) are nebulized using an ultrasonic nebulizer and inhaled for 3 min at identical peak inspiratory pressures as used throughout the experiment. A 3-min nebulization of 1 mg/mL milrinone results in vaporization of 14 μg of the phosphodiesterase-3 inhibitor as determined by microgravimetry. Therefore, the respective dose of 39 μg/kg is analog to inhaled doses in human studies. For intravenous delivery, milrinone (initial bolus of 2-10 μg/kg, followed by 0.2-1 μg/kg/min) or equivalent volumes of NaCl (0.9%; initial bolus of 1.6 mL/kg, followed by 10 μL/kg/h) are administered by an infusion pump for 10 min.

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

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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.

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