Drug	Serum concentration level for dosing every 24 hours (μg per mL)	Serum concentration level for dosing every 36 hours (μg per mL)	Serum concentration level for dosing every 48 hours (μg per mL)	Traditional method preferred (μg per mL)	Expected trough, before next dose (μg per mL)
Amikacin (Amikin)	<8	9 to 15	16 to 26	>26	<5.0
Gentamicin†	<3	3 to 5	5 to 7	>7	<0.5 to 1.0
Netilmicin (Netromycin)†	<3	3 to 5	5 to 7	>7	<0.5 to 1.0
Tobramycin (Nebcin)†	<3	3 to 5	5 to 7	>7	<0.5 to 1.0