Abstract
Thirty patients who chose extradural analgesia for elective Caesarean section were pretreated, by random selection, with cimetidine 400 mg, ranitidine 150 mg or no H2-blocker. Following the administration of 0.5% bupivacaine, no significant difference was found between peak plasma bupivacaine concentrations or area under the plasma bupivacaine concentration-time curve (AUC) in these three groups. This study shows that a single dose of cimetidine or ranitidine does not affect significantly the disposition of bupivacaine in the obstetric patient.
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