It may be a joke, but it seems to me that Whingey is upset and a bit confused. Maybe the "anti-bollox pills" were prescribed to calm down her speech because she was talking incoherently when she was admitted?
I once had a TIA and one of the symptoms was that when I spoke I didn't get the words right - do you remember the entertainer Stanley Unwin's monologues? They sounded as if they ought to make sense, but you couldn't understand them. It may be pills for that. Or perhaps she means antibiotics?