Comparison Efficiency of Oral Etoricoxib Versus Intravenous Fentanyl on Post Operative Pain in Curettage Under TIVA

Inclusion Criteria: * Women who having abnormal uterine bleeding undergoing fractional curettage under TIVA Exclusion Criteria: * Women who have opioid or NSAIDs allergy * Women who disagree to participate in this study * Women who have history of gastrointestinal bleeding or ulcer * Women who have abnormal kidney function * Women who can't understand Thai language * Women who have American Society of Anesthesiologists \[ASA\] above 2 * Women who have been used NSAIDs in 48 hours or often used NSAIDs