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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Antimicrob+Agents+Chemother
2017 ; 61
(3
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
The Oral ?-Lactamase SYN-004 (Ribaxamase) Degrades Ceftriaxone Excreted into the
Intestine in Phase 2a Clinical Studies
#MMPMID28052855
Kokai-Kun JF
; Roberts T
; Coughlin O
; Sicard E
; Rufiange M
; Fedorak R
; Carter C
; Adams MH
; Longstreth J
; Whalen H
; Sliman J
Antimicrob Agents Chemother
2017[Mar]; 61
(3
): ä PMID28052855
show ga
SYN-004 (ribaxamase) is a ?-lactamase designed to be orally administered
concurrently with intravenous ?-lactam antibiotics, including most penicillins
and cephalosporins. Ribaxamase's anticipated mechanism of action is to degrade
excess ?-lactam antibiotic that is excreted into the small intestine. This
enzymatic inactivation of excreted antibiotic is expected to protect the gut
microbiome from disruption and thus prevent undesirable side effects, including
secondary infections such as Clostridium difficile infections, as well as other
antibiotic-associated diarrheas. In phase 1 clinical studies, ribaxamase was well
tolerated compared to a placebo group and displayed negligible systemic
absorption. The two phase 2a clinical studies described here were performed to
confirm the mechanism of action of ribaxamase, degradation of ?-lactam
antibiotics in the human intestine, and were therefore conducted in subjects with
functioning ileostomies to allow serial sampling of their intestinal chyme.
Ribaxamase fully degraded ceftriaxone to below the level of quantitation in the
intestines of all subjects in both studies. Coadministration of oral ribaxamase
with intravenous ceftriaxone was also well tolerated, and the plasma
pharmacokinetics of ceftriaxone were unchanged by ribaxamase administration.
Since ribaxamase is formulated as a pH-dependent, delayed-release formulation,
the activity of ribaxamase in the presence of the proton pump inhibitor
esomeprazole was examined in the second study; coadministration of these drugs
did not adversely affect ribaxamase's ability to degrade ceftriaxone excreted
into the intestine. These studies have confirmed the in vivo mechanism of action
of ribaxamase, degradation of ?-lactam antibiotics in the human intestine
(registered at ClinicalTrials.gov under NCT02419001 and NCT02473640).