Fluid and fiber can help overcome constipation. Triphala from Ayurvedic medicine may help, as could avoiding foods that cause allergies.
Eating high-fiber foods such as kiwifruit can help intestinal microbes and fight chronic constipation better than MiraLAX or psyllium.
A number of natural remedies for constipation work well. They include eating two kiwifruit or a pumpkin-bran muffin daily.