Dose requirements of ICI 35,868 (Propofol, ‘Diprivan’) in a new formulation for induction of anaesthesia

Summary In order to avoid Cremophor‐related reactions and reduce the incidence of pain on injection, di‐isopropylphenol (ICI 35,868; propofol) has been reformulated as an emulsion. One hundred and fifteen patients received an induction dose of propofol in the new formulation. The dose required to induce anaesthesia in 95% of healthy, unpremedicated patients was 2.5 mg/kg. Induction was associated with a degree of cardiovascular and respiratory depression. There were no adverse reactions although there were a number of minor side‐effects. The incidence of pain on injection was low (3%) and the overall quality of induction was assessed as good or adequate in 92% of patients.