In 1967, it was reported that administration of pentazocine can cause bizarre central nervous system disturbances very soon. Followed by many other psychotomimetic side effects with respect to pentazocine been reported. Hallucinations were the most commonly reported visual disturbances noted in various reports.It was reported in many studies that pentazocine is used in the form of intravenous anaesthetic technique in more number of cases with no major events encountered which are clinically significant. There are few evidences that pentazocine eliminates aurosal phenomenon when used as an adjuvant therapeutic drug intermittent to alphadolone or alphaxaloneanaesthesia, which is usually associated with other anaesthetics use. In the present study we aim to assess the adverse events that are reported in view of visual dreaming following administration of morphine or pentazocine as premedication and to report on the same.The type of dreams experienced by the patients of both the groups included pleasant and unpleasant dreams. In which the total percentage of unpleasant dreams encountered patients in morphine group were of 10.63% and with respect to pentazocine was 24.3%.It is already evident that all potent analgesic agents have a potential to provoke side effects related to psychotomimetic at different dosing levels. In our present study it was implicated from the case reports that pentazocine and morphine are proven to cause dreams (visual effects).