“CONCLUSIONS Melatonin premedication significantly decreased the doses of both propofol and thiopental required to induce anesthesia.”
“… Melatonin … thiopental ED50 values for loss of response to verbal command and eyelash reflex from 3.4 mg/kg (95%confidence interval, 3.2–3.5 … mg/kg (2.6–2.9 mg/kg) and 2.6 mg/kg (2.5–2.7 mg/kg), respectively (P < 0.05).”