Yes, Lax-A-Day is an effective and safe solution for children and adults to treat constipation, be it
difficulty having a bowel movement, no bowel movement for a few days, or a feeling of incomplete defecation, among others.
The amount of powder to be diluted in a small amount of liquid varies according to your child's weight. Your pharmacist will be able to give you the right weight and document your child's file for follow-up purposes.
In terms of prevention, make sure your child stays well hydrated, and possibly encourage him to increase his fiber intake, especially in fruits and vegetables.
I hope this has been helpful and if you have any further questions, please do not hesitate to contact me!