Hi and welcome to Healthcare Magic. Thanks for your question... From your description, I infer that your uncle is having transient visual hallucinations. Now, Flucloxacillin is not known to cause any hallucinations or psychiatric symptoms. However anti-parkinsonian medication are well known to cause psychotic symptoms including hallucinations. The other aspect to consider is that since he is on a cocktail of medicaton, interactions between medication can occur and this can sometimes lead to erratic levels of a particular drug, thus increasing the risk for side effects. Moreover, in elderly persons, who have multiple medical complications and who are on multiple medication, delirium should also be considered as a differential diagnosis. (symptoms of delirium include confusion, disorientation, disturbance in the sleep-wake cycle and hallucinations) As regards the treatment, anxiolytics are not the specific treatment of choice for hallucinations. He may need to be started on anti-psychotics, but again, this has to be on a low dose and given with caution, because anti-psychotics have a risk of worsening his Parkinson s symptoms. I would suggest that you take him for a consultation with a Psychiatrist, who would be able to make a detailed assessment and advice appropriate treatment. All the best. - Dr. Jonas Sundarakumar Consultant Psychiatrist