My father is 59 years old and started treatment to lose weight ...

Hello! my father is 59 years old and started to get a weight loss treatment, he went to a gastro doctor who prescribed for him some medicines, other than he already takes for pressure and for sleeping. In the morning on waking he takes naprix 10 + 5mg and bup 150 mg, at 10 o'clock in the morning he takes, 1 rivotril sublingual 0.25mg, 1 sibutramine 15mg, and one manipulated with laminaria japonicae phaseolamina, the 16 repeats the same dose of the 10 hours and before sleeping stilnox 10mg. In short, in short, he lost 28kg in 80 days, but the problem is that after a couple of months he started to behave differently, he is seeing things where they do not exist, he says that my mother is cheating on him, that she looks different for him, he is very low self-esteem, persecution mania, does not socialize with his friends, does not want to go to dinners anymore, just wants to stay at home. My mother is super worried because he is super good with her, and suddenly out of nowhere he looks at her and says that she is cheating on him, that she is strange. Everyone who lives with him knows this is not normal, but he says we tell him he's crazy, but we'll see he's right. Wondering if this combination of remedies he's taking is leaving him with these hallucinations? the worst is that he thinks it has nothing to do with the remedies, I would like a clarification on this, Thank you,