Hello, the pharmacist has made the right choice in recommending Lax-a-Day. This medication does not induce tolerance or dependency, so it is safe to give it to your child on a regular basis until the situation is resolved. It is best to give it to your child for a month, every day, using the right dose for his weight, and then gradually decrease the dose by going one day a week without giving it to him, then two, then three and so on. Administering this medication only during periods of constipation does not work as well, as Lax-a-Day may take 1 day to take effect. Note that certain foods can cause constipation in children this age. Milk taken in excess is certainly one of the most common causes. Try to limit your milk intake to no more than 24 ounces (720mL) of milk per day. You should see a difference in less than a week.