Yes, you are right. Have a friend in a nursing home. Said lots of constipation there..so nurses use what you described..they call it "The bomb". Prunes themselves work for me, but a little too well..I had two to three small prunes, and I was going all day. Wish I knew of something where it will help you, and you go once a day..no cramping. I may try the Linzess again or Magnesium Citrate supplement tabs.