My question is, can I safely take various preparations of codeine (apap, ibuprofen, aspirin), at the same time as to avoid overdosing on a single one? I live in Canada so these are all readily available.
Ibuprofin and Aspirin are both NSAID drugs, so they should not be taken together. Taking Acetaminophen and Ibuprofen together is alright, so long as you take reasonable doses of each.