IRCT201701258375N11 IRCT 2017-10-02 Research deputy Birjand University of Medical Science Effect of apotel injection on opioid consumption Effect of preoperative apotel on opioid consumption during and after herniorrhaphy 2017-05-15 anticipated 100 Complete https://irct.ir/trial/8853 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment. 2-3 Post-operative pain control. Intervention 1: Patients in the case group will receive 15 mg/kg bodyweight apotel (interavenous acetaminophen) half an hour before the start of surgery. Surgery will be performed as usual and then, based on the pain intensity, an analgesic drug (pethidine) will be given to the patients and they will not receive another medication as preanesthetic medication. Intervention 2: In the patients of control group, surgery is performed as usual, and after then, based on the pain intensity, an analgesic drug (pethidine) will be given to the patients and they will not receive another medication as preanesthetic medication.