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Home » , , , » Pharmacology of Milrinone
Pharmacology of Milrinone
Saturday, March 31, 2012 Posted by Piscean

Pharmacology of Milrinone


Indication Indicated for the treatment of congestive heart failure.
Pharmacodynamics Milrinone, a synthetic dimethylxanthine derivative structurally related to theophylline and caffeine, is used in the treatment of peripheral vascular diseases and in the management of cerebrovascular insufficiency, sickle cell disease, and diabetic neuropathy.
Mechanism of action Milrinone inhibits erythrocyte phosphodiesterase, resulting in an increase in erythrocyte cAMP activity. Subsequently, the erythrocyte membrane becomes more resistant to deformity. Along with erythrocyte activity, Milrinone also decreases blood viscosity by reducing plasma fibrinogen concentrations and increasing fibrinolytic activity.
Absorption Milrinone is rapidly and almost completely absorbed after oral administration. Bioavailability is 92% (in healthy volunteers).
Volume of distribution
  • 0.38 liters/kg [intravenous injections of 12.5 mcg/kg to 125 mcg/kg to congestive heart failure patients]
  • 0.45 liters/kg [intravenous infusions of 0.20 mcg/kg/min to 0.70 mcg/kg/min to congestive heart failure patients]
Protein binding 70 to 80%
Metabolism
There are five metabolites but the O-glucuronide represents the major pathway of biotransformation.
Route of elimination The primary route of excretion of milrinone in man is via the urine.
Half life 2.3 hours
Clearance
  • 0.13 L/kg/hr [congestive heart failure patients, following IV injections of 12.5 mcg/kg to 125 mcg/kg]
  • 0.14 L/kg/hr [congestive heart failure patients, following infusions of 0.2 mcg/kg/min to 0.7 mcg/kg/min]
Toxicity LD50 = 0.3 mg/L in rats

 



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