This is what dad is currently being fed. I understand that a few meat and vegetables items are included in this diet:
~ Coloxyl + Senna (for constipation and only at night)
~ Asprin (for blood thinning)
~ Digoxin (for his heart fibrillation)
~ Vitamin B12 - via injection - not sure how frequently
~ Risperidone (0.5mg at 4:00 pm every day)
~ Haloperidol (0.5mg when required but not more than two times per day)
It looks as if the Haloperidol has been sneaked in in place of Zyprexa. It is another anti-psychotic drug. And this is what Wikipedia has to say about it:

A multi-year UK study by the Alzheimer's Research Trust suggested that this and other neuroleptic anti-psychotic drugs commonly given to Alzheimer's patients with mild behavioural problems often make their condition worse. The study concluded that

For most patients with AD, withdrawal of neuroleptics had no overall detrimental effect on functional and cognitive status and by some measures improved functional and cognitive status. Neuroleptics may have some value in the maintenance treatment of more severe neuropsychiatric symptoms, but this possibility must be weighed against the unwanted effects of therapy. The current study helps to inform a clinical management strategy for current practice, but the considerable risks of maintenance therapy highlight the urgency of further work to find, develop, and implement safer and more effective treatment approaches for neuropsychiatric symptoms in people with AD.
And the contraindications include patients with heart problems and the elderly. It really feels like we are swimming against a tide of knee-jerk medical reactions, doctors blindly following a flow chart and never actually looking at the whole patient, and constant reversion to type, every time we take our eyes off them.