Introduction: Post operative pain after surgery is a cause of significant morbidity and patient dissatisfaction. In this study we try to compare efficacy between 1 gram acetaminophen oral dose with 1 gram acetaminophen intravenous dose in controlling post operative pain. Material and methods: This study is a prospective, randomized and comparative study conducted at NRI institute of medical sciences, Visakhapatnam between Oct 2016 to October 2017. 90 patients belonging to ASA status I and II of both genders, age group-18 to 60 years and undergoing surgeries under general anaesthesia lasting less than 2 hours were enrolled for the study. 2 groups out of which Group A received 1gm oral paracetamol and Group B received 1gm intravenous paracetamol. The grous were compared post operatively for pain scores at 30, 60, 90, 120, 150 minute after surgery using visual analogua scale(VAS) results: The mean VAS scores were 2.78, 4.07, 5.81, 6.36, 6.5 for Group A and 2.18, 3.5, 4.76, 6.04, 6.43 for Group B. Thus pain scores were consistently lesser in Group B than Group A. Pain scores were significantly lower in Group B during the time period 30 mins and 90 mins (p values 0.039 and 0.002 respectively). The time of first rescue analgesia (i.e, Fentanyl) was compared in both the groups. Mean for time of demand for analgesia was 88.67 mins and 102 mins in Group A and Group B respectively. P value was 0.05 thus a significantly earlier requirement of rescue analgesia in Group A. Conclusion: The rescue analgesic requirement was significantly lesser in intravenous acetaminophen group. Hence 1gm intravenous paracetamol is superior to oral formulation in controlling post operative pain.