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Antimicrobial Agents and Chemotherapy, March 2002, p. 739-745, Vol. 46, No. 3
0066-4804/02/$04.00+0 DOI: 10.1128/AAC.46.3.739-745.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Single- and Multiple-Dose Pharmacokinetics of Caspofungin in Healthy Men
Julie A. Stone,1* Sherry D. Holland,1 Peter J. Wickersham,1 Andrew Sterrett,1 Michael Schwartz,1 Cynthia Bonfiglio,1 Michael Hesney,1 Gregory A. Winchell,1 Paul J. Deutsch,1 Howard Greenberg,2 Thomas L. Hunt,3 and Scott A. Waldman2
Merck Research Laboratories, West Point, Pennsylvania 19486,1
Thomas Jefferson University, Philadelphia, Pennsylvania 19107,2
Pharmaco International, Inc., Austin, Texas 787043
Received 5 April 2001/
Returned for modification 4 September 2001/
Accepted 15 November 2001
Caspofungin, a glucan synthesis inhibitor, is being developed as a parenteral antifungal agent. The pharmacokinetics of caspofungin following 1-h intravenous infusions in healthy men was investigated in four phase I studies. In an alternating two-panel (six men each), rising-single-dose study, plasma drug concentrations increased proportionally with the dose following infusions of 5 to 100 mg. The ß-phase half-life was 9 to 10 h. The plasma drug clearance rate averaged 10 to 12 ml/min. Renal clearance of unchanged drug was a minor pathway of elimination (
2% of the dose). Multiple-dose pharmacokinetics were investigated in a 2-week, serial-panel (5 or 6 men per panel) study of doses of 15, 35, and 70 mg administered daily; a 3-week, single-panel (10 men) study of a dose of 70 mg administered daily; and a parallel panel study (8 men) of a dose of 50 mg administered daily with or without a 70-mg loading dose on day 1. Moderate accumulation was observed with daily dosing. The degree of drug accumulation and the time to steady state were somewhat dose dependent. Accumulation averaged 24% at 15 mg daily and
50% at 50 and 70 mg daily. Mean plasma drug concentrations were maintained above 1.0 µg/ml, a target selected to exceed the MIC at which 90% of the isolates of the most clinically relevant species of Candida were inhibited, throughout therapy with daily treatments of 70 or 50 mg plus the loading dose, while they fell below the target for the first 2 days of a daily treatment of 50 mg without the loading dose. Caspofungin infused intravenously as a single dose or as multiple doses was generally well tolerated. In conclusion, the pharmacokinetics of caspofungin supports the clinical evaluation of once-daily dosing regimens for efficacy against fungal infections.
* Corresponding author. Mailing address: WP75-100, Merck Research Laboratories, West Point, PA 19486. Phone: (215) 652-5705. Fax: (215) 993-3533. E-mail:
julie_stone{at}merck.com.
Antimicrobial Agents and Chemotherapy, March 2002, p. 739-745, Vol. 46, No. 3
0066-4804/02/$04.00+0 DOI: 10.1128/AAC.46.3.739-745.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
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