I took Revlimid for a year and a half, 25 mg daily for 3 weeks on and a week off. My bathroom problems were horrendous. I was taking senna tablets (senna is a natural laxitive and can be purchased online or at any health food store w/out precsription) and a stool softener twice daily plus a glass of miralax. When I took my weekly steroids I would add more miralax.
Even with all that there were 4 or 5 occasions I was so stopped up I had to administer an enema after 2 days without a BM. The first enema in my my life was after 3.5 days w/out a BM. I called my ONC Nurse and told her I was in pain and should I come to the ER. She told me to put vaseline on my finger and put it up my butt and pull the feces out. Of course I wasn't happy with this and said I'd rather go to the ER. She told me that they would do the same thing at the ER. So my wife ran to the drugstore and came back with some suppositories. Thankfully that worked.
Even though I am now in remission, my BM's have returned to normal and I have been off the Rev/dex for 6 months the experience was such that I carry senna, softeners, miralax, and suppositories with me everywhere I go. I stuck with the Rev/dex treatment and am convinced that is what put me in remission.
By the way something everyone here will appreciate is that I recently bought a comic t-shirt. It was a brown t-shirt and in yellow letters said: I Pooped Today. A few years ago I probably would have said "how crass." Now, like I'll bet the readers here would do, I smile and wear it with a great deal of satisfaction.
Good luck, best wishes, and most importanly, happy pooping to all.