Background: One of the surgical techniques that is most frequently utilised in the globe, particularly in day-case settings, is inguinal hernia repair. Aim and objectives: The goal of the study was to ascertain how patient outcomes can be affected by postoperative analgesia following adult inguinal hernia surgery with bupivacaine and magnesium sulphate in transversus abdominis plane (TAP) block. Subjects and methods: Between March 2021 and January 2022, at Al-Azhar University Hospitals (Assiut). According to Class I or II American Society of Anesthesiologists (ASA), and planning for a main unilateral open elective inguinal hernia repair we recruited 60 adult male patients between the ages of 21 and 60 years old for the current study Result: Group II had significantly lower VASr and VASm than group I. Mean VAS_r at 4 and 8 hours postoperatively were 3.43 and 3.87 respectively for group I and 2.33 and 3.37 respectively for group II. Mean VAS_m at 4 and 8 hours postoperatively were 4.72 and 5 respectively for group I and 2.78 and 3.52 respectively for group I.  Conclusion: Pre-emptive magnesium sulphate added to plain bupivacaine during a transversus abdominis plain block (TAPB) performed on patients under ultrasonographic guidance to treat an inguinal hernia lengthens the time until the first opioid administration is necessary and lengthens the duration of the block.