My husband started on Memantine after being on Donepezil for many months. Please share your experience with Memantine.

Honestly, as an RN I think that sharing our own personal experiences with ANY drug is not something we should attempt to do. People vary and they react VERY differently to medications. What is a godsend for one is an emergency bad reaction to another. And what helps one does nothing for another. It is all dependent on the individual patient and should be discussed with his or her MD.
Expert advice questions don't belong on a Forum of strangers. Legal needs attorney, financial a CPA, and medical an MD.
I wish you the best and hope that this works. Keep a diary of medications, dosages and reactions if you are in charge of them and good luck.