Wild lettuce is a plant. The leaves, sap (latex), and seed are used to make medicine. Wild lettuce is used for whooping cough, asthma, urinary tract problems, cough, trouble sleeping (insomnia), restlessness, excitability in children, painful menstrual periods, excessive sex drive in women (nymphomania), muscular or joint pains, poor circulation, swollen genitals in men (priapism), and as an opium substitute in cough preparations. Whooping cough. Asthma. Urinary tract problems. Cough. "Hardening of the arteries" (atherosclerosis). Trouble sleeping (insomnia). Restlessness. Painful menstrual periods. Sexual disorders. Muscle and joint pain. Killing germs, when the latex is applied to the skin. Other conditions.