Hi, thanks four your question. I can understand your concerns.
Answer: Medications such as Narco and other opioids, depending on the dose, can cause confusion and
hallucinations (
acute confusional state) but there are other important aspects in father case that should not be ignored.
As you have mentioned that he was alright before surgery, it looks like one of the following risk factors could be responsible for his condition.
1. Surgery puts enormous stress on body and is a risk factor for delirium and other confusional states.
2. Drugs such as opioids and other medications used during anaesthesia
3. Infection anywhere in the body especially lungs and
urinary tract.
4. Derangement in various body salts such as sodium, potassium, etc.
5. Decreased oxygen level (hypoxia) in the blood
6. Stroke,
7.
sleep deprivation, old age,
dementia, coexisting medical conditions etc.
So, I would recommend that your father be seen by a doctor who will thoroughly examine him and investigate for the cause of his condition and treat him according.
Hope this help. Please feel free to ask for any further clarification.