Val Milagu (Piper Cubeba)Vaal Milagu (Piper Cubeba) People use cubebs for increasing urination to relieve water retention. They also use it to treat a certain parasitic infection in the intestines called amoebic dysentery. Other uses include treatment of intestinal gas, gonorrhea, and cancer. Some people take it for loosening mucus. How does it work? Cubebs contains cubebic acid, which might have an effect on the urinary and respiratory tracts. Uses & Effectiveness