Bupivacaine is three to four times more potent than lignocaine4 and has a longer duration of action. Bupivacaine is an amide group of drug that is most frequently used for spinal anaesthesia. Both hyperbaric and isobaric forms are available. Hyperbaric solutions produce a more predictable extension of sensory block, short duration of block and faster recovery than isobaric solutions. The study was undertaken after obtaining ethical committee clearance as well as informed consent from all the patients. One hundred and twenty six patients in the age group between 20 years and 60 years of either sex belonging to ASA I and II posted for elective lower abdominal surgeries were grouped randomly into two groups (n=63). The mean time taken for attaining the maximum sensory blockade is 8.62±2.08 minutes in Group 1 and in Group 2 it is 8.71±2.59 minutes. Statistically there is no significance between the groups (p>0.05). The mean time taken to achieve maximum motor blockade in Group 1 is 7.03±2.24 minutes and in Group 2 it is 8.56±2.49 minutes, which is statistically significant between the groups (p<0.001).