Easy method to calculate mixtures of constant infusions of drugs

Is there an easy method to calculate mixtures of constant infusions of drugs? 

Several methods are used. Here is one easy method:

  • • For constant infusion of drugs (epinephrine, isoproterenol) beginning at 0.1 μg/kg/minute : 0.6 times the weight (in kg) equals the number of milligrams of drug to add to enough water to make a total of 100 mL of solution. The resultant solution is then infused at a rate of 1 mL/hour, delivering 0.1 μg/kg/minute.
  • • For constant infusion of drugs (dopamine, dobutamine) beginning at 1 μg/kg/minute : 6 times the weight (in kg) equals the number of milligrams of drug to add to enough water to make a total of 100 mL of solution. The resultant solution is then infused at a rate of 1 mL/hour, delivering 1 μg/kg/minute.
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