The treatment can make it more difficult to pass urine and some people may find they need to use a catheter for a time. There is also a chance of getting a urine infection.
Anyone who starts on this treatment should have a face-to-face check up or be reviewed over the phone within four weeks, says NICE.
Prof Mark Baker, director of the Centre for Clinical Practice at NICE, said: "Urinary incontinence is a distressing condition affecting the lives of millions of women of all ages.