Seconding @mrJL and @andyp. Constipation and rib pain is no fun. If it happens, and you are partial to it, Guinness was my "loosener" of choice when I came off the codeine. Just be wary of booze + pills, of course. And if you feel a sneeze coming on, put your thumb under your top lip and squeeze your lip. Something about a nerve there that can suppress a sneeze. Saw it on a Dr. Hilary slot on This Morning on my first sick day when I detached some ribs, ended up being a life/dignity saver for a few months.