Kidney stones (Z, B) & Urinary obstruction (Z) (ID: 2529) All Complaints for this Species Kidney & Urinary Tract Anti-lithic, Deobstruent 1. Cook plant in water alone or + "sharashib el-dura" (stigamata of Zea maydis (see NOTES 1) & drink. (Z) 2. Decoct ground rhizomes & drink. (B) Gastrointestinal Laxative Cook plant in water alone or + "sharashib el-dura" (stigamata of Zea maydis (see NOTES 1) & drink.