not sure what you mean by opioid+nsaid prescription painkillers, so I’ll assume it’s a mix of opiods plus NSAIDs. wouldn’t make much sense to add aspirin/naproxen/ibuprofen on top of that, as they are also NSAIDs and that role’s already been filled

paracetamol is also a fairly good painkiller so my guess is they’re probably going for some synergy there as well