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Tuesday, February 21, 2012

A dosing problem for your entertainment

A  patient is maintained on  an oral drug, given 4-hourly, but develops some adverse effects too frequently during periods of peak plasma concentrations.  Measurements show that his plasma concentration fluctuates between 120 and 60 microgram/L.
The physician decides he would rather place him on a continuous infusion.
What maintenance dose rate would you suggest then?

Parameters for the drug are:
Bioavailability 25%
Volume of distribution:  2.4 L/kg
Pt. Weight: 80 Kg
Plasma Half-life: 4 hours

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