A prospective randomized double-blinded placebo controlled study on the effects of adjuvant tamsulosin OCAS in the treatment outcome of patient receiving extracorporeal shock wave lithotripsy for renal calculi

INTERVENTION: Two groups :Tamsulosin OCAS vs Placebo for 12 weeks ; CONDITION: Renal Stone PRIMARY OUTCOME: Successful treatment ‐ Defined as either stone free or presence of clinically insignificant residual fragments (less than 4mm) at 12 weeks after one session of lithotripsy.; SECONDARY OUTCOME: Analgesics demand after treatment, maximal pain occurred after SWL, time to stone passage, stone free rate; INCLUSION CRITERIA: 1. Adult patient (aged >=18 years old); 2. Solitary radio‐opaque renal stones of size 5‐15 mm in maximal diameter as measured from plain radiography; 3. Clinically decided for primary ESWL.