<prompt> Medical treatment for gall bladder stone is amenable for :Stones less than 15 mm in sizeRadioopaque stoneCalcium bilirubinate oxalate stoneNonfunctioning stones associated with gall bladder  <response>: Answer is A Size of stone less than 15mm Medical therapy for gall bladder stone is amenable for stones 15 mm preferably Prerequisites for medical therapy : Gall bladder should he functioning Stones should be radiolucent Size should be small preferably 15 mm Q -Harrison 14h 10nin-Harrison 16th Stones should be cholesterol stones only Obvious by thier mechanism of actionQ Newer edition of Harrison has mentioned the size of stone to be preferably 10 mm rather than 15 mm but we will go with same answer because the question was framed in older times. Medical therapy for Gall stone dissolution consists of administration of : UDCA Ursodeoxycholic acidQ CDCA Choledeoxycholic acidQ Mechanism of action: Inhibit HMG-CoA reductase activityQ, which in turn results in decreased hepatic cholesterol synthesis. Allows dispersion of cholesterol from stones by physicochemical means. 