purgative [ˈpɜ:rgətɪv]

例句:

• The doctors attempted to reduce his high fever by inducing diarrhea with a purgative.
  医生们尝试用通便药物催泻以使他退烧。
  
• This oil acts as a purgative / has a purgative effect.
  这种油有催泻作用.
  
• Causing evacuation, especially of the bowels; purgative.
  排泄的,排除的引起腹泻, 尤指肠泻的; 净肠的.
  
• He drank a dish of cream from time to time, but he believed that whey and buttermilk had purgative effects.
  来自NEWYORKER