Moxifloxacin (Avelox)

C. diff Risk

High

Oral Bioavailability

Excellent

Approximate Cost

PO ~ $1.50/day
IV ~ $14.00/day

Dosing

General Information

Common Usage

  • Pneumonia including CAP, HAP, aspiration.

  • Some intra-abdominal infections.

  • CNS infections.

Drug Monitoring

Monitor QTc in patients with increased risk.

Adverse Effects

  • QTc prolongation

  • Dysglycemia

  • Rash

  • Tendinopathy and rupture

  • GI upset

  • Weakness exacerbation in myasthenia gravis

  • CNS toxicity including confusion, psychosis

Major Interactions

QTc prolongation - Increased risk with other agents that prolong QTc

Divalent cations including Ca, Mg - Decreased absorption

Warfarin - Increased INR

Rifampin - Decrease moxifloxacin levels.

Pharmacology

Antimicrobial class: Fluoroquinolone

Pregnancy category: C

Average serum half life: 12 hours

Urine penetration: Poor

Lung penetration: Therapeutic

CSF penetration: Therapeutic

Biliary penetration: Therapeutic