Sure there is - we discussed this in your other topic. He's got major medication interactions going on (possibly). Had he done anything even remotely like this beforehand?
I recall in your other topic, you said he's sick of doctors. However, if he's on big time pain medication, he needs to see a doctor in order to get his prescriptions reupped. That's the time to get the info in front of a doctor that he seems to be having drug interactions. Most doctors will perform some sort of an examination, or at least will insist on him coming in, before signing off on a new round of powerful drugs.
In the meantime, push for him to go even before that. If he's still in pain, then the stuff he's taking is not only making him paranoid and hallucinatory; it's also not working to manage his pain, which is why it was prescribed for him in the first place. So see if you can get him to his primary care physician, sooner, rather than later. That is, if you want to continue hanging around at all.
PS Given all the stuff he takes, is he still operating a motor vehicle? Because someone who is seeing things (which appears to be the case here - and I must reiterate that I am no doctor) is a danger on the road, to himself and others.