"Hospital discharge process"

My mother is in hospital often due to her illness. So I spend a lot of time here making sure she has everything and listen to what doctors say. But the worst part is when you get called and advised your Mum is ready to go home and you arrive with her clothes thinking all she has to do is get ready. Well no, they have to get medicine which she has been prescribed and we sit waiting for over four hours each time. That is not acceptable as she is sitting dressed waiting and the car park is so expensive as it is and the Pharmacy just take over four hours to do anything. Well we have been here four hours now to find out that they don't have the medication in stock and I will have to get it from our pharmacy. Why not tell us four hours ago and now too late to get to the pharmacy fir something she needs. What is happening with the NHS.