Why is it hard to poo?

Same po. My OB prescribed lactulose and psyllium husk for 5 days. nag-improve naman pero medyo matigas pa rin after I finished yung medication and supplement. I drink lots of water pero feeling ko, kulang ako sa fiber so I started eating pear or apple sa umaga and more veggies sa meals. I also eat prunes and drink yakult. Slightly improving pero not yet there sa target kong consistency ng stool. Increase lang din ng fiber intake, mamsh, aside from lots of water/fluids.