I may name change after this out of sheer embarrassment...
Had a wisdom tooth out last week and due to huge amounts of swelling and pain I've not been able to drink much. I have been taking solphadine which of course has the dreaded codeine in it. And now, of course, I am really, really badly constipated. REALLY badly...tried a suppository and discovered that the poo has turned to concrete 
The lovely nurse practitioner has given me Movicol (4 sachets, see what happens) and an enema which has helpfully been dispensed without any kit and I cannot physically get back in the car and go back to ask for whatever I might need!
Will the Movical do the trick? And how long before it kicks in?! Should I eat? My lower back is killing me too 