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Summary of 4 Agents
for serious Staphylococcus aureus infections
  • CUBICIN® (daptomycin for injection)
  • Vancocin® HCl (Vancomycin Injection, USP)
  • Zyvox® (linezolid injection/tablets/oral suspension)
  • Tygacil® (tigecycline for injection)

Indications


VREF = vancomycin-resistant Enterococcus faecium

Safety


AEs = adverse events; CBCs = complete blood counts
* Highlighted text represents new information added to package inserts in March 2007.
C.difficile warning was not added to Vancocin package insert as of August 2007.



CIAI = complicated intra-abdominal infections; CPK = creatine phosphokinase; HMG-CoA = 3-hydroxy-3-methyl-glutaryl-Coenzyme A; SSRIs = selective serotonin reuptake inhibitors
* CUBICIN should be discontinued in patients with unexplained signs and symptoms of myopathy in conjunction with CPK elevation >1000 U/L (~5X ULN), or in patients without reported symptoms who have marked elevations in CPK >2000 U/L (310X ULN).

Administration, Dosing, and Monitoring in Adults


cSSSIs = complicated skin and skin structure infections; LRTIs = lower respiratory tract infections; CAP = community-acquired pneumonia; VREF = vancomycin-resistant E. faecium; CPK = creatine phosphokinase; CBCs = complete blood counts.
* In patients with creatinine clearance <30 mL/min, including those undergoing hemodialysis or continuous ambulatory peritoneal dialysis, 4 mg/kg q48h for cSSSI and 6 mg/kg q48h for S. aureus bacteremia, including right-sided endocarditis.
Dosage adjustment must be made in patients with impaired renal function.
Dosage adjustment necessary in patients with severe hepatic impairment (Child Pugh C).

Microbiology


*Bactericidal activity against Gram-positive pathogens.
In general, exhibits bacteriostatic activity against enterococci and bactericidal activity against streptococci and staphylococci.5-7
Bacteriostatic against enterococci and staphylococci. Bactericidal against most streptococci.
§ In general, bacteriostatic against aerobic and facultative Gram-positive and -negative pathogens, anaerobic microorganisms, and Mycobacterium abscessus, Mycobacterium chelonae, and Mycobacterium fortuitum in vitro.

Susceptibility


MSSA = methicillin-susceptible Staphylococcus aureus; MRSA = methicillin-resistant S. aureus; X = active both in vitro and in clinical infections; In vitro only = active in vitro, but clinical significance is unknown
* Including avium, casseliflavus, and gallinarum.

Acquisition Cost*


*Cost per day calculated using wholesale acquisition cost as listed in Thomson Micromedex Red Book™ ReadyPrice® System (March 2007 release) and assuming a 70-kg patient dosed according to the applicable package insert.
WAC = wholesale acquisition cost, the list price to wholesalers without regard to prompt payment terms, discounts, rebates, or chargebacks.
Assumes no product wastage. Less frequent dosing needed for patients with renal impairment. In patients with creatinine clearance <30 mL/min, CUBICIN should be dosed at 4 mg/kg q48h or 6 mg/kg q48h.
§ Vancomycin cost is approximated using a weighted average WAC of all generic formulations weighted by sales volume per IMS (Q105). Recommended vancomycin dosing for patients with creatinine clearance <30 mL/min varies based on several clinical variables referenced in the Vancocin package insert.
|| 100 mg loading dose followed by 50 mg BID. Cost of loading dose averaged over assumed average 10 day course of therapy.

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References: 1. CUBICIN® [package insert]. Lexington, MA: Cubist Pharmaceuticals, Inc.; 2007. 2. Vancocin® HCl [package insert]. Deerfield, IL: Baxter International Inc.; 2003. 3. Zyvox® [package insert]. New York, NY: Pfizer Inc; 2007. 4. Tygacil® [package insert]. Madison, NJ; Wyeth; 2007. 5. Akins RL, Rybak MJ. Bactericidal activities of two daptomycin regimens against clinical strains of glycopeptide intermediate-resistant Staphylococcus aureus, vancomycin-resistant Enterococcus faecium, and methicillin-resistant Staphylococcus aureus isolates in an in vitro pharmacodynamic model with simulated endocardial vegetations. Antimicrob Agents Chemother. 2001;45:454-459. 6. Pankuch GA, Jacobs MR, Appelbaum PC. Bactericidal activity of daptomycin against Streptococcus pneumoniae compared with eight other antimicrobials. J Antimicrob Chemother. 2003;51:443-446. 7. Watanakunakorn C, Tisone JC. Effects of a vancomycin-rifampin combination on enterococci. Antimicrob Agents Chemother. 1982;22:915-916.