IRCT20161205031252N8 IRCT 2018-08-29 Ghoum University of Medical Sciences The effect of ursodeoxycholic acid for treatment of large and multiple common bile duct stones The effect of adding ursodeoxycholic acid to common bile duct (CBD) stenting for treatment of large and multiple CBD stones 2018-09-06 anticipated 64 Complete https://irct.ir/trial/33456 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The patients will be assigned to two groups of intervention and control by block randomization. For this purpose blocks of size 4 will be used. Six blocks will include BAAB, ABBA, BABA, BBAA, ABAB, AABB. To hide the random allocation, the numbered dark envelopes will be used, in which the group name is specified in the random sequence generated. Then, according to the order of entering samples, for the first patient the envelope number one is opened and the group will be identified until the end. N/A CBD stones. Intervention 1: Intervention group: Common bile duct stenting with Ursodeoxycholic Acid capsule, KoushanPharmed company, 300 mg, oral, once daily, for two months. Intervention 2: Control group: Common bile duct stenting. No - There is not a plan to make this available Justification or reason for not sharing IPD is The data are specific to this study