Grabow L, Hein A, Hendrikx B, Thiel W, Schilling E
Anasth Intensivther Notfallmed. 1986 Feb;21(1):13-6.
In a randomised study, 6 different premedications (oral flunitrazepam, oral pentobarbital, oral NaCl solution; intramuscular pethidine, intramuscular droperidol/fentanyl, and intramuscular NaCl solution) were administered to 600 patients, to determine the equal efficacy of oral and intramuscular application. The results show a significantly better mode of action of oral premedication.