From Mount Sinai medical library, "Stinging nettle has been used for hundreds of years to treat painful muscles and joints, eczema, arthritis, gout, and anemia.
Today, many people use it to treat urinary problems during the early stages of an enlarged prostate (called benign prostatic hyperplasia or BPH). It is also used for urinary tract infections, hay fever (allergic rhinitis), or in compresses or creams for treating joint pain, sprains and strains, tendonitis, and insect bites...Stinging nettle root is used widely in Europe to treat BPH.
Studies in people suggest that stinging nettle...may be effective at relieving symptoms such as reduced urinary flow, incomplete emptying of the bladder, post urination dripping, and the constant urge to urinate.
It is important to work with a doctor to treat BPH, and to make sure you have a proper diagnosis to rule out prostate cancer." Reference Page #4.
Take 4 full droppers per day for relief from urinary retention.