Background: In 2001 was authorized IV paracetamol for its use in Europe. In Guatemala it was used for the first time until 2016. This formulation has awakened different expectations around the world, for this reason its administration was evaluated when added to the multimodal postoperative analgesia treatment to demonstrate its efficiency. Objective: The aim of this study is to evaluate the analgesic effect in the multimodal treatment for acute postoperative pain with IV paracetamol in a group of Guatemalans patients.  Methods: Retrospective case-control study for the evaluation of acute postoperative pain (24 hours) by adding IV paracetamol to the standard analgesic protocol. Patients of both sexes, between 18 and 70 years old, with a weight greater than or equal to 50 kg with open or laparoscopically elective surgery, in a sample of 110 patients divided into two groups. The number of patients needing rescue dose and the level of pain according to the Visual Analogue Scale (VAS) were compared during 4 evaluations in the acute postoperative period. To determine the correlation between the variables, the chi square independence test was used. Results: Adding IV paracetamol to standard treatment decreases the number of patients who require rescue doses with opioids and improves their analgesia during the acute postoperative period. Conclusions: IV paracetamol is of benefit when added to the conventional multimodal postoperative analgesia treatment of a private hospital.