Iron overdose
I think this will be the 4th time you see it here but I have to join the Miralax chorous. I have to have it everyday.
I find it important to not to skip taking it even if everything has been "moving" along fine. Remember it takes 3-4 days to work so by the time you realize you need it again then start taking it you might have a period of misery there.
I get the generic from Amazon. 3 bottles for like $30 and it's a good price.