Constipation and how to deal with it

I haven't had my surgery yet but am looking at posts. In the past I've had IBS - so bouts of constipation. One thing that helped is psyllium husks.  You can buy this very fine but bran like powder in health food shops, the chemist and grocery stores. You can sprinkle it on your cereal or put it in a smoothie. Alternatively, I get it in capsule form from Pharmacy 777. You need to drink a lot of water with it as it uses the water to swell up and move things along. My naturopath suggested it as an alternative. Is constipation a side effect of chemo?