Compatibility of bupivacaine and iohexol in two mixtures for paediatric regional anaesthesia.

The compatibility of bupivacaine (0.25% and 0.125% wt/vol) with iohexol 300 mg I/ml was investigated. At room temperature bupivacaine does not decompose in these mixtures over a period of 24 h. pH Values (7.10 and 7.33), clarity, osmolality (370 and 379 mOsm/kg) and buffer capacity (0.035 ml and 0.010 ml 0.1000 mol/l NaOH per 10 ml) meet requirements for epidural injection. Both mixtures are suitable for epidurography.