| Adverse effects | Bupivacaine N (%) | Bupivacaine + Morphine N (%) | p-value |
| Nausea and vomiting | 2 (25.0) | 0 | b<0.001 |
| Headache | 2 (25.0) | 0 |
|
| Pruritus only | 2 (25.0) | 11 (57.8) |
|
| Pruritus and Respiratory distress | 0 | 1 |
|
| Chills | 2 (25.0) | 0 |
|
| Pruritus, Nausea, and Vomiting | 0 | 6 (31.60) |
|
| Urine retention | 0 | 1 (5.26) |
|
| Total | 8 | 19 |
|