Mix of constipation followed by incontinence issues. Any help to keep things moving and when he can't make it, products that may help?

My mom used to get constipated too. I bought the no taste, no clump fiber power mix to stir into her water daily. I use about one teaspoon a day and it helps. She has a bowel movement once every other day. Without the fiber, she could go for 3-5 days without going #2. One time she ended up in ER for fecal compaction. She stayed for 5 days then came home all confused. She never recovered to her normal before the ER. Not something I want to repeat again.

A lot of people aren't "interested yet in disposable underwear" when they clearly need them, I've never understood why they think wetting/soiling your clothes and surroundings is so much less embarrassing. Buy the underwear style incontinence briefs and put them in the drawer in place of his boxers so there is no longer a choice. And monitor his laxative use, see-sawing between constipation and incontinence is often the result of overdoing the laxatives.