Dosing of antimicrobials in obesity: Difference between revisions

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{| class="wikitable"
{| class="wikitable"
! Drug !! Usual Dose !! Obesity !! Max dose
! Drug !! Usual Dose !! Obesity !! Notes
|-
|-
| [[Amoxicillin]]
| [[Amoxicillin]]
| 250-500 mg q8h
⚫
|
| 1 g PO q8h
| 1 g PO q8h
| No data
|
|-
|-
| [[Ampicillin]]
| [[Ampicillin]]
| 1-2 g q4-6h
⚫
|
| 2 g IV q4h
| 2 g IV q4h
|
|
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|
|
| 2 g IV q4h
| 2 g IV q4h
| No data
|
|-
|-
| [[Piperacillin-tazobactam]]
| [[Piperacillin-tazobactam]]
| 4.5 g IV q6-8h
| 4.5 g IV q8h (q6h for ''Pseudomonas'')
| Prolonged infusion
| Prolonged infusion
⚫
|
| 18 g daily
|}
|}


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| 1-2 g IV q8h
| 1-2 g IV q8h
| 2-3 g IV q6-8h
| 2-3 g IV q6-8h
⚫
|
| No data; 12 g daily
|-
|-
| [[Cephalexin]]
| [[Cephalexin]]
| 500-1000 g PO qid
| 500-1000 g PO qid
| 1000 g PO qid
| 1000 g PO qid
| No data
|
|-
|-
| [[Cefipime]]
| [[Cefipime]]
| 2 g IV q8h
| 2 g IV q8h
| 2 g IV q8h prolonged infusion
| 2 g IV q8h prolonged infusion
⚫
|
| 2 g IV q8h prolonged infusion
|-
|-
| [[Ceftazidime]]
| [[Ceftazidime]]
| 2 g IV q8h
| 1-2 g IV q8h
| 2 g IV q8h prolonged infusion
| 2 g IV q8h prolonged infusion
| 2 g IV q8h prolonged infusion
⚫
|
|-
|-
| [[Ceftazidime-avibactam]]
| [[Ceftazidime-avibactam]]
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| [[Ceftaroline]]
| [[Ceftaroline]]
|
|
| Consider 18h
| Consider q8h
|
|
|}
|}
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==== Carbapenems ====
==== Carbapenems ====
{| class="wikitable"
{| class="wikitable"
! Drug !! Usual Dose !! Obesity !! Max dose
! Drug !! Usual Dose !! Obesity !! Notes
|-
|-
| [[Doripenem]]
| [[Doripenem]]
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|-
|-
| [[Meropenem]]
| [[Meropenem]]
| 500 mg q6h (1 g IV q8h for febrile neutropenia)
⚫
|
| Consider prolonged infusion
| Consider prolonged infusion
|
|
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=== Quinolones ===
=== Quinolones ===
{| class="wikitable"
{| class="wikitable"
! Drug !! Usual Dose !! Obesity !! Max dose
! Drug !! Usual Dose !! Obesity !! Notes
|-
|-
| [[Ciprofloxacin]]
| [[Ciprofloxacin]]
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|-
|-
| [[Levofloxacin]]
| [[Levofloxacin]]
| 750 mg PO q24h
| 500-750 mg PO q24h
| Consider up to 1000 mg PO q24h
| Consider up to 1000 mg PO q24h
|
|
|-
|-
| [[Moxifloxacin]]
| [[Moxifloxacin]]
| 400 mg q24h
⚫
|
| Usual dose
| Usual dose
|
|
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=== Macrolides ===
=== Macrolides ===
{| class="wikitable"
{| class="wikitable"
! Drug !! Usual Dose !! Obesity !! Max dose
! Drug !! Usual Dose !! Obesity !! Notes
|}
|}


=== Tetracyclines ===
=== Tetracyclines ===
{| class="wikitable"
{| class="wikitable"
! Drug !! Usual Dose !! Obesity !! Max dose
! Drug !! Usual Dose !! Obesity !! Notes
|}
|}


=== Aminoglycosides ===
=== Aminoglycosides ===
{| class="wikitable"
{| class="wikitable"
! Drug !! Usual Dose !! Obesity !! Max dose
! Drug !! Usual Dose !! Obesity !! Notes
|-
|-
| [[Amikacin]]
| [[Amikacin]]
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=== Others ===
=== Others ===
{| class="wikitable"
{| class="wikitable"
! Drug !! Usual Dose !! Obesity !! Max dose
! Drug !! Usual Dose !! Obesity !! Notes
|-
|-
| [[Aztreonam]]
| [[Aztreonam]]
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|-
|-
| [[Colistin]]
| [[Colistin]]
| 5 mg CBA/kg IBW x1 loading (max 300 mg) followed by 5 mg/kg/day divided q8h
|
| Use IBW
| Use IBW
| 360 mg daily (nephrotoxicity)
| Max 360 mg daily (nephrotoxicity)
|-
|-
| [[Polymyxin B]]
| [[Polymyxin B]]
|
|
| Use ABW<sub>0/4</sub>
| Use ABW<sub>0/4</sub>
| 200 mg or 2 MU daily (toxicity)
| Max 200 mg or 2 MU daily (toxicity)
|-
|-
| [[Clindamycin]]
| [[Clindamycin]]
| 300-450 mg PO q6-8h<br/>600-900 mg IV q8h
|
| 600 mg IV q6h<br/>900 mg IV q8h<br/>450-600 mg PO q6h<br/>600-900 mg PO q8h
| 600 mg IV q6h<br/>900 mg IV q8h<br/>450-600 mg PO q6h<br/>600-900 mg PO q8h
| 2700 mg daily; or 4800 mg daily IV if life-threatening
| Max 2700 mg daily, or 4800 mg daily IV if life-threatening
|-
|-
| [[Dalbavancin]]
| [[Dalbavancin]]
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|-
|-
| [[Daptomycin]]
| [[Daptomycin]]
| 4-6 mg/kg q24h
|
| Use ABW<sub>0.4</sub>
| Use ABW<sub>0.4</sub>
|
|
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|
|
|-
|-
| [[Cotrimoxazole]]
| [[TMP-SMX]]
| Up to 320 mg(TMP) PO q12h<br/>8-10 mg(TMP)/kg<sub>ABW</sub> in divided doses
| Up to 320 mg(TMP) PO q12h<br/>8-10 mg(TMP)/kg<sub>ABW</sub> in divided doses
| Consider ABW<sub>0.4</sub> when doing high dose
| Consider ABW<sub>0.4</sub> when doing high dose

Revision as of 16:43, 9 December 2019

Calculating Body Weight

Statistic Equation (Male) Equation (Female) Notes
Body mass index (BMI) (kg/m2) kg and m
Body surface area (BSA) (m2) kg and cm
Ideal body weight (IBW) (kg) in inches
Adjusted body weight (ABW) (kg) C = 0.3 to 0.4
Lean body weight (LBW) (kg)

Antibiotics

β-lactams

Penicillins

Drug Usual Dose Obesity Notes
Amoxicillin 250-500 mg q8h 1 g PO q8h
Ampicillin 1-2 g q4-6h 2 g IV q4h
Nafcillin 2 g IV q4h
Piperacillin-tazobactam 4.5 g IV q8h (q6h for Pseudomonas) Prolonged infusion

Cephalosporins

Drug Usual Dose Obesity Max dose
Cefazolin 1-2 g IV q8h 2-3 g IV q6-8h
Cephalexin 500-1000 g PO qid 1000 g PO qid
Cefipime 2 g IV q8h 2 g IV q8h prolonged infusion
Ceftazidime 1-2 g IV q8h 2 g IV q8h prolonged infusion
Ceftazidime-avibactam Usual dose
Ceftolozane-tazobactam Usual dose
Ceftaroline Consider q8h

Carbapenems

Drug Usual Dose Obesity Notes
Doripenem Consider extended infusion
Ertapenem 1 g IV q24h Usual dose
Imipenem Usual dose
Meropenem 500 mg q6h (1 g IV q8h for febrile neutropenia) Consider prolonged infusion

Quinolones

Drug Usual Dose Obesity Notes
Ciprofloxacin 500-750 mg PO q12h or 400 mg IV q6-8h 400 mg IV q8h or 750 mg PO q12h
Levofloxacin 500-750 mg PO q24h Consider up to 1000 mg PO q24h
Moxifloxacin 400 mg q24h Usual dose

Macrolides

Drug Usual Dose Obesity Notes

Tetracyclines

Drug Usual Dose Obesity Notes

Aminoglycosides

Drug Usual Dose Obesity Notes
Amikacin Use ABW0.4
Gentamicin Use ABW0.4
Tobramycin Use ABW0.4

Others

Drug Usual Dose Obesity Notes
Aztreonam 2 g IV q6-8h
Colistin 5 mg CBA/kg IBW x1 loading (max 300 mg) followed by 5 mg/kg/day divided q8h Use IBW Max 360 mg daily (nephrotoxicity)
Polymyxin B Use ABW0/4 Max 200 mg or 2 MU daily (toxicity)
Clindamycin 300-450 mg PO q6-8h
600-900 mg IV q8h 		600 mg IV q6h
900 mg IV q8h
450-600 mg PO q6h
600-900 mg PO q8h 		Max 2700 mg daily, or 4800 mg daily IV if life-threatening
Dalbavancin Usual dose
Daptomycin 4-6 mg/kg q24h Use ABW0.4
Linezolid 600 mg PO/IV q12h Usual dose
Oritavancin Usual dose
TMP-SMX Up to 320 mg(TMP) PO q12h
8-10 mg(TMP)/kgABW in divided doses 		Consider ABW0.4 when doing high dose
Telavancin Usual dose
Tigecycline Usual dose
Vancomycin 20-25 mg/kg load (max 2.5 g)
10-15 mg/kg q12h (maintenance) 		Use TBW; or 25-30 mg/kg load and 15 mg/kg q12h with ABW0.4

Further Reading

  • Comprehensive Guidance for Antibiotic Dosing in Obese Adults. Pharmacotherapy. 2017;37(11):1415-1431. doi: 10.1002/phar.2023
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