Alpha Blockers for Facilitating Stone Passage

Efficacy of Alpha Blockers for Stone Passage

• Alpha blockers significantly increase stone passage rates by 29% (CI: 20% to 37%) compared to control treatments, making them more effective than calcium channel blockers like nifedipine, which only increase passage rates by 9% (CI: 7% to 25%) 1, 3
• The mechanism of action is attributed to ureteral smooth muscle relaxation mediated through alpha-1 receptor blockade, which facilitates stone passage and reduces pain 1

Specific Alpha Blockers and Their Comparative Efficacy

• Tamsulosin has been the most extensively studied alpha blocker for MET and is commonly recommended 1, 2
• A small study demonstrated that tamsulosin, terazosin, and doxazosin are equally effective in facilitating stone passage 1

Clinical Application

• Alpha blockers should be considered as first-line MET for ureteral stones with a low probability of spontaneous passage 1
• In pediatric patients with uncomplicated ureteral stones ≤10mm, observation with or without MET using alpha-blockers is recommended 4