Therefore , a drug given by the intravenous route will have an absolute bioavailability of 100 % ( f = 1 ) , .
Drugs given by other routes usually have an absolute bioavailability of less than one .
Therefore , a drug given by the intravenous route will have an absolute bioavailability of 100 % ( f = 1 ) , whereas drugs given by other routes usually have an absolute bioavailability of less than one .