Is Kipper on Parade V or is there just a Parade which I could buy from chemist? I had a look on Google for Memantine and not fond of that from the description?
I think it’s straight up Pardale (brand name Pardale V), which is only from our vets. Pardale is 400mg of paracetamol with 9mg of codeine (details
here), but often if there’s a shortage vets will suggest human paracetamol at a different dose. With Memantine, this is prescribed in humans for mild to moderate dementia symptoms and is off license for dogs. It’s commonly used in OA as adjunctive pain relief alongside other drugs - there’s a recent review
here that covers current evidence thoroughly, with the usual finding that mechanisms of action are highly under-researched in dogs, and large scale randomized controlled trials are needed.
It’s definitely a conversation to have with your vet - and if that’s not satisfactory, I’d talk to a different vet. I know you’ve been trying to do this for a long time, so you have every sympathy that this must be frustrating.