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The duration of action of sub-arachnoid block is short, and one of the ways to overcome this is the use of oral clonidine. Methods: 108 patients of ASA I and II, aged 18 to 65 years undergoing lower abdominal surgeries under spinal anaesthesia were randomized into three groups.. Control group A (n=36) no oral clonidine pre-medication, Group B (n=36) and group C (n=36) received 100 μg and 200 μg of oral clonidine pre-medication respectively, 1hr before spinal anaesthesia. Haemodynamic parametersdoi:10.4314/ahs.v18i4.49 fatcat:62fqejsj5jfd7dtdsp3icyw2ea