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Antimicrobial Agents and Chemotherapy, November 2000, p. 2948-2953, Vol. 44, No. 11
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Once-Daily Dosing in Dogs Optimizes Daptomycin Safety

F. B. Oleson Jr.,1,* C. L. Berman,2 J. B. Kirkpatrick,3 K. S. Regan,3 J.-J. Lai,1 and F. P. Tally1

Cubist Pharmaceuticals, Inc., Cambridge,1 and Consultant, Wayland,2 Massachusetts, and WIL Research Laboratories, Ashland, Ohio3

Received 21 September 1999/Returned for modification 17 January 2000/Accepted 15 July 2000

Daptomycin is a novel lipopeptide antibiotic with potent bactericidal activity against most clinically important gram-positive bacteria, including resistant strains. Daptomycin has been shown to have an effect on skeletal muscle. To guide the clinical dosing regimen with the potential for the least effect on skeletal muscle, two studies were conducted with dogs to compare the effects of repeated intravenous administration every 24 h versus every 8 h for 20 days. The data suggest that skeletal-muscle effects were more closely related to the dosing interval than to either the maximum concentration of the drug in plasma or the area under the concentration-time curve. Both increases in serum creatine phosphokinase activity and the incidence of myopathy observed at 25 mg/kg of body weight every 8 h were greater than those observed at 75 mg/kg every 24 h despite the lower maximum concentration of drug in plasma. Similarly, the effects observed at 25 mg/kg every 8 h were greater than those observed at 75 mg/kg every 24 h at approximately the same area under the concentration-time curve from 0 to 24 h. Once-daily administration appeared to minimize the potential for daptomycin-related skeletal-muscle effects, possibly by allowing for more time between doses for repair of subclinical effects. Thus, these studies with dogs suggest that once-daily dosing of daptomycin in humans should have the potential to minimize skeletal-muscle effects. In fact, interim results of ongoing clinical trials, which have focused on once-daily dosing, appear to be consistent with this conclusion.

* Corresponding author. Mailing address: Cubist Pharmaceuticals, Inc., 24 Emily St., Cambridge, MA 02139. Phone: (617) 576-1999. Fax: (617) 576-0271. E-mail: roleson{at}cubist.com.

Antimicrobial Agents and Chemotherapy, November 2000, p. 2948-2953, Vol. 44, No. 11
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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