Why nifedipine used in renal colic?

Nifedipine, a calcium channel blocker, is used in renal colic to help alleviate pain and facilitate the passage of kidney stones. It works by relaxing the smooth muscles in the ureter, which can reduce spasms and improve urine flow. This vasodilation also enhances blood flow to the affected area, potentially reducing ischemic pain. Additionally, its rapid onset of action can provide quick relief for patients experiencing acute pain from kidney stones.