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 IV
AmBisome (liposomal amphotericin B)
Amikacin
Bezlotoxumab
Cidofovir
Colistin IV
Daptomycin
Flucytosine
Foscarnet (CMV dosing)
Ganciclovir
Gentamicin
Miltefosine
Pentamidine IV
Plazomicin
Polymyxin B
TMP/SMX (trimethoprim/sulfamethoxazole)
Tobramycin
Voriconazole