Dosing Weights

Different weights should be used for drugs dosed on a mg/kg basis depending on the physicochemical properties of the drug, as noted in the table below. For patients with extreme obesity or who are significantly underweight, or if toxicity is suspected, consult ID Pharmacy for dosing assistance.

Ideal and adjusted body weight calculator.

Drug Name Adjustment in Obesity
Acyclovir
AmBisome (liposomal amphotericin B)
Amikacin
Colistin IV
Daptomycin
Ethambutol
Flucytosine
Foscarnet
Ganciclovir
Gentamicin
Plazomicin
Polymyxin B
Pyrazinamide
TMP/SMX (trimethoprim/sulfamethoxazole)
Tobramycin
Vancomycin IV
Voriconazole