Hello and Welcome,
It would be helpful if you could let everyone know by way of your profile what kind of cancer you have and what your tx plan is. So sorry you have to be here but it is a good place to gather knowledge and learn from the experience of others. It has helped me immensely.
As for the constipation ask the doc for an rx of lactulose. That really helped my husband. Also, since you are still swallowing, OTC Magnesium supplement will do the trick. Hope that helps.