C. diff Risk


Oral Bioavailability


Approximate Cost


250-500 mg po TID. Some guidelines may recommend higher dosing.

CrCl Less Than 10 mL/min
250-500 mg q24h

CrCl Greater Than 30 mL/min
250-500 mg TID

General Information

Common Usage

Therapy of Streptococcal and Enterococcal infections as well as susceptible gram negative infections.

Commonly used for upper respiratory infections and urinary tract infections.

Adverse Effects

  •  Allergy/rash (immediate or delayed)

  •  Note EBV related rash

  •  Cytopenias

Major Interactions

Allopurinol - increased rash


Antimicrobial class: Aminopenicillin

Pregnancy category: B

Average serum half life: 1 hour

CSF penetration: Moderate with inflamed meninges only

Biliary penetration: Therapeutic

Lung penetration: Therapeutic

Urine penetration: Therapeutic