Diazepam may be given orally or intravenously. Intravenous administration gives a rapid onset of action. The drug is dissolved in propylene glycol, which may cause thrombophlebitis, pain on injection and cardiac arrhythmias. | Diazepam may be given orally or intravenously. Intravenous administration gives a rapid onset of action. The drug is dissolved in propylene glycol, which may cause thrombophlebitis, pain on injection and cardiac arrhythmias. |