Why should the reconstituted Sandoz Limited co-amoxiclav 1000/200 mg injection/infusion product not be added to infusions containing dextran or bicarbonate?

The reconstituted Sandoz Limited co-amoxiclav 1000/200 mg injection/infusion product should not be added to dextran- or bicarbonate-containing infusions because it is less stable in them, but may be injected into the drip tubing over three to four minutes.