商品名：Metamucil and generic brands
Bulk-forming laxative. The action of psyllium is to absorb water and expand to provide increased bulk and moisture content to the stool, which encourages normal peristalsis and bowel motility. Psyllium also may have antilipidemia effects.
Psyllium is administered orally for treatment of constipation and bowel evacuation. In horses, it has been used for treating sand colic, but the effectiveness for this indication has not been shown.
劑量數字暫停提供：VetPro 的劑量改依 DRUGAPI 藥物資料庫對外的內容，DRUGAPI 目前不提供可直接計算的劑量。下方列出 DRUGAPI 的審查結論與劑量審查引用的來源；計算機可手動輸入劑量換算。
洋車前子的證據量依物種、疾病、完整飲食或散粉產品、每單位有效量、水合方式、結腸功能及是否阻塞而不同；現有犬 g/kg 寬幅是研究資料誤轉，貓與馬 protocol 也不可通用計算。須由獸醫師核對精確產品與病況後個別處方。