An smooth extubation and decreasing cough on extubation without increasing post-operative psychomotor dysfunction has been an anesthesia concern especially in ambulatory surgeries; therefore using a strong anxiolytic with minimal psychomotor dysfunction for premedication is very desirable. In this study, it was hypothesized that Passiflora incarnata decreases cough on extubation. Design: A Double Blind, Placebo Controlled Study. METHODS: In this double blinded placebo controlled study, 120 patients would be divided into Passiflora group (n=60) receiving oral Passiflora incarnata and placebo group (n=60) receiving placebo, 90 min before surgery. After extubation patients are observed to record any coughing or other adverse effects such as bronchospasm. Inclusion criteria: Patients referring to our anesthesia clinic, classified as American Society of Anesthesiologists (ASA) physical status of I or II, aged 18-60, who will be candidated for ambulatory inguinal herniorhaphy. Exclusion criteria: Patients with a history of anxiety disorders or consuming sedative, analgesic, antidepressant, or anti epileptic drugs; addict patients; patients with numerical rating scale (NRS) of less than one, for anxiety; Patients with any contraindications to the medications of study. Interrvention: Passiflora incarnata, 500 mg, ( Passipy TM Iran Darouk) orally used 120 min before surgery in one group, and Placebo, orally used, 120 min before surgery in another group. Main outcome variables: Investigation and comparison of cough reduction in both groups, evaluating and comparing occurrence of psychomotor disorder between the both groups.