The sap of wild lettuce is a milky substance found in the plant that has narcotic, hypnotic, and sedative effects.
Properties
Wild lettuce is a biennial herb that can grow up to 2 meters tall.

The leaves at the base form a rosette and are larger than those growing along the flowering stem.
Any part of the plant oozes milky sap when cut.
Uses
It has been used to induce sleep, calm anxiety, and relieve pain.
It has been used to treat eye ulcers.
It has been used to treat spider bites.
It has been used to treat scorpion stings.
It has been used to treat disordered appetite for fornication.