Drug-induced vomiting
If reducing the does or withdrawing the offending drug are not options then an attempt, often unsatisfactory, may be made to oppose it by another drug. In general, chlorpromazine or another phenothiazine or metoclopramide, are best. Opioid-induced vomiting responds to one of the drugs used for motion sickness (above); cyclizine and morphine are combined as Cyclimorph.