Purpose of Investigation: The purpose was to evaluate the effects of aminophylline on returning of spontaneous respiration and recovery profiles during propofol-fentanyl-sevoflurane anesthesia without muscle relaxants in patients undergoing day care gynecological surgery. Materials and Methods: Sixty-six patients were enrolled. Either aminophylline 3 mg/kg (group A) or saline (group C) was administered to each patient. Tidal volume (Vt), respiratory rate (RR), and end tidal carbon dioxide (ETCO₂), apneic time, recovery time, discharge time and modified observer’s assessment of alertness/sedation scale (MOAA/S) were evaluated. Results: Apneic time and recovery time were significantly shorter in Group A than in Group C (P < 0.01). MOAA/S, tidal volume (P = 0.02) and ETCO₂ (P = 0.03) were significantly improved in Group A compared with Group C. Conclusion: Aminophylline effectively reduced apneic and recovery time, thereby improving respiratory and recovery profiles during anesthesia with propofol, fentanyl, and sevoflurane in brief day care surgeries.