Bleeding associated with cephalosporins is because of the side chains interfering with prothrombin synthesis
Some cephalosporins have been associated
with bleeding complications.
It may be due to hypoprothrombinaemia
and/or platelet dysfunction occurring with cephalosporins and cephamycins
having an N-methylthiotetrazole side-chain, including
• cefamandole
• cefbuperazone
• cefmenoxime
• cefmetazole
• cefonicid
• cefoperazone
• ceforanide
• cefotetan
• cefpiramide
• latamoxef.
The presence of a methylthiadiazolethiol
side-chain in cefazolin, or an N-methylthiotriazine ring in ceftriaxone, might
also be associated with such bleeding disorders.
Hypoprothrombinaemia is usually reversible
with vitamin K.
It was previously thought to be due to an
alteration in intestinal flora but interference with prothrombin synthesis now
seems more likely.
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