Really bad constipation! doc said miralax (polyethylene glycol) daily, can i try miralax (polyethylene glycol) mixed in prune juice for better results since prune juice didn't help by itself?

Yes, however...: It is wise to treat constipation and MiraLAX (polyethylene glycol) may help; it is safe to take with prune juice. But this does not address the cause; eat more fiber, drink more water, exercise, try probiotics, get tested for hypothyroidism. I advise you try triphala, an ayurvedic formula that has many health benefits ; better addresses the cause: http://www.Planetherbs.Com/specific-herbs/the-wonders-of-triphala.Html.