Many oral analgesic drugs such as nonsteroidal anti-inflammatory drug(NSAID) are used to relieve pain from gynecological procedure and dysmenorrhea. Hyoscine-N-butyl bromide, an antispasmodic drug are commonly used for relief of smooth muscle spasms and can use to relieve genito-urinary spasm. Some studies reported hyoscine can't relieve pain in minor gynecological procedures. So the efficacy of hyoscine use are still controversial and no previous studies investigated its efficacy for pain relief in HSG procedure.