To evaluate the effect of three different intrathecal opioid mixtures on post-operative pain experiences in women who have undergone caesarean section surgery, relating specifically to:~Post-operative analgesic requirements at two time points (12 hours and 24 hours) after surgery~Pain scores at two time points (12 hours and 24 hours) after surgery~Sedation scores at two time points (12 hours and 24 hours) after surgery~Post-operative nausea scores at two time points (12 hours and 24 hours) after surgery~Post-operative pruritis scores at two time points (12 hours and 24 hours) after surgery~To determine the impact that the patients' post-operative pain has on their activities in the first 24 hours after surgery
This is an interventional drug trail to evaluate the effect of different intrathecal opioids on post-operative pain experiences in women who have undergone caesarean section surgery.