My son stays days without evacuating what to do?

My son stays days without evacuating, what kind of medicine can I give him, when he looks like a brick, he's 12 years old?
Expert answer:

there is no effective remedy for it, and laxatives can even make the problem worse. The only way to regulate bowel function is through a balanced diet, rich in fruits, vegetables and cereals (granola, oats, flax, wheat bran), whole foods and plenty of liquid and regular exercise; limiting the intake of pasta and milk helps as well.