My child is 10 years old and has still has a bed wetting problem. What is an effective remedy.?

Bedwetting alarm. Also check previous answers on enuresis or bedwetting amongst healthtap answers.
DDAVP (desmopressin) and ... It appears your child has never achieved bladder control since birth (primary enuresis). Children with primary enuresis often respond well to ddavp(urine concentrating hormone). In case of poor response, alarm device attachable to underwear would be next treatment option which provides higher success rate. Consult your pediatrician for further details.