If your child is healthy and no reason for bedwetting is found, there are several things to consider. Although they don't always work they are worth a try. Sometimes a special pad is used on the child's underwear at bedtime. The pad senses when the child urinates and causes a buzzer to sound or an alarm to ring. Medication such as pills, liquid or nasal sprays.
Some parents prevent bedwetting by making child go to bathroom just before parents go to bed.
In older children there are drugs that may be tried. It comes in pill for or nasal spray. Bill and Marta Sears have 7 Steps to Dry Nights . Parent's Common Sense Encyclopedia , Bedwetting . This site contains many other topics, written and sponsored by a pediatrician.