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Background: Postoperative pain brings about undesirable effects such as medical complications, increased healthcare costs, and the need for opioids administration. The aim of this study was to determine the effect of low dose (0.15 mg/kg) ketamine in comparison with the placebo on postoperative pain and analgesics consumption after cesarean section. Materials and Methods: In a randomized clinical trial, 120 women undergoing elective cesarean section were randomly divided into case and control groups. Ketamine (0.15 mgkg-1) or an equal volume of normal saline were administered intravenously immediately after initiating spinal anesthesia to the case and control groups, respectively. The anesthesia and surgery techniques were the same for both groups. Data were analyzed using SPSS version 11. Results: Means of age in the case and control groups were 28.85±4.81 and 28.87 ±5.62 years, respectively. Analgesics consumption, pain scores, homodynamic signs, drowsiness of the mothers, and the neonates’ Apgar scores after cesarean section were similar in both groups and no significant differences were found between them (P>0.05). The mean of postoperative arterial pressure in the early hours in the ketamine group showed a significant decrease compared to the placebo group (P>0.03). The means of the first time of request for analgesics after surgery in the ketamine and placebo groups were 99.75±68.88 and 96.1±52.59 minutes, respectively (P>0.05). Conclusion: It seems that the administration of 0.15 mg/kg dose of ketamine (0.15mg/kg) does not have a significant impact on decreasing the postoperative pain in cesarean section. Therefore, in order to obtain the desirable analgesic effects of this drug, further studies should be conducted with greater doses of this drug and its use in combination with other opioids.

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Background: Nausea and vomiting are prevalent after laparoscopic cholecystectomy surgery and physicians need to use drugs, such as ondansetron, propofol, metoclopramid, and ramostrogen, for controlling them. This study was done to evaluate the effect of gabapentin 300mg and 600mg administration on controlling nausea and vomiting after laparoscopic cholecystectomy surgery. Materials and Methods: In this clinical trial, 105 ASA patients (classes 1 and 2) were randomly divided into 3 equal groups including placebo group, 300 mg gabapentin group, and 600 mg gabapentin group. The same technique of anesthesia was used for all groups. The patients were controlled for nausea and vomiting each 2 to 6 hours and after that every 4 to 18 hours. Data were analyzed using SPSS software. Results: The mean degree of nausea in the control group was 2.8, in second group which took 300 mg gabapentin was 0.67, and in third group which took 600 mg of gabapentin was 0.55 (p<0.001). In addition, the severity of vomiting in the control group was 0.326, in second group was 0.126, and in third group was 0.053 (p<0.001). Conclusion: Administration of one dose of 300 mg gabapentin can reduce nausea and vomiting, and with increasing gabapentin dosage to 600 mg, these complications will decrease even more. Therefore, using gabapentin in laparoscopic cholecystectomy surgery is recommended