90 parturients, belonging American Society of Anaesthesiologists Physical status (ASA-PS) class II planned for elective lower segment caesarean section (LSCS) under spinal anaesthesia (SA), will be thoroughly evaluated as a part of preanaesthetic evaluation, 24hours prior to the procedure. Fasting of 6 hours for solids and 2 hours for clear liquids will be ensured. Intravenous (IV) access will be secured in the ward as per our institutional policy. All patients will be randomised into two groups using shuffled sealed opaque envelop (SNOSE) technique.

Group B- Will receive 10mg (2ml) of 0.5% hyperbaric bupivacaine-(H) and 100mcg morphine.

Group L- Will receive 10mg(2ml) of 0.50 % hyperbaric levobupivacaine (H) and 100mcg morphine.

To ensure blinding, the anaesthesiologist who performs spinal anaesthesia will not be further involved in the study. A different anaesthesiologist designated as the observer will only enter the operation theatre after spinal anaesthesia has been administered. Neither the observer nor the parturient will be disclosed any information regarding which drug to be administered. Hence the observer and the parturient will be blinded for the study.

In the operation theatre standard monitoring devices will be attached, including electrocardiography (ECG), automated NIBP (non-invasive blood pressure), pulse oximetry (SpO₂) and baseline values of SBP (systolic blood pressure), DBP (diastolic blood pressure), MAP (mean arterial pressure) will be recorded. The hemodynamic multiparameter monitor will be placed in the direct line of vision of the anaesthesiologist performing the Spinal Anaesthesia. Spinal anaesthesia will be administered using 25 G Quincke’s needle at the L2–L3 or L3–L4 interspace in sitting position. Immediately after administration of spinal anaesthesia, the parturient will be made to lie down in supine posture with 10 cm wedge beneath the right buttock.

Intraoperatively sensory blockade will be checked using pin prick method and motor blockade will be checked by modified Bromage score. The level of sensory and motor block will be assessed every 1 minute for the 1^st 10 minutes and every 5 minutes till the completion of the surgery. Surgery will be allowed to start once the sensory level reaches T6 level.

Any hypotension, defined as a decrease in systolic blood pressure of < 20% below baseline, will be managed using 6 mg of intravenous ephedrine.

Heart rate will be monitored every minute for the first 10 mins and every 5 mins for the next 30mins Any bradycardia with heart rate < 60bpm will be managed by using 0.6mg of intravenous atropine.

Perioperatively subjects will be followed up till they regain their motor power and sensation. In the immediate postoperative period, all patients will receive intravenous Inj. Paracetamol 1g 6^th hourly. Postoperative analgesia will be assessed using VAS score and a rescue analgesic of Inj. Diclofenac will be given if the VAS score is found to be greater than or equal to 3.