Tincture of the fresh plant in flower is used for preparing the medicine.  Common Name: Stinging-Nettlex Causes & Symptoms for SBL Urtica urens Complaints that arise after Burns, Blows, Sting-bees, bites are relieved with the help of Urtica Urens. Supressed milk, swelling in the breasts, fever blisters, are common symtpoms. It is one of the best remedies for 1st degree burns which can be used Internally as well as externally