The generic version of Miralax is good. MD told me to use it, and it never causes cramps. I mix it with Gatorade. It has practically no taste.

Another great product is in the tea section of the grocery store. It's called "Smooth Move." You make it just like tea. It's active ingredient is Senna. I brew it 25 minutes to make it stronger. This stuff is fantastic. Effective, without cramps. However, it is a stimulant, and stimulants all have the potential to make you dependent on them. That's why doctors prefer the Miralax. But the Senna tea works faster if you need quick action.