Can fiorinal with codeine (aspirin butalbital caffeine and codeine) #3 cause itching?

Narcotic itch: Great question. Any narcotic (or opioid medication) can cause the side effect of itching. If the itching is severe, you may have to change to a different medication. Many other things can cause itching too. If you continue to have itching after stopping the medication, then you have to rule out other potential offending agents.

Side effects: Is can be. Per Drugs.Com, pruritus (itching) can occur in 0.1% to 1% of people who take the medication. REF: https://www.drugs.com/sfx/fiorinal-with-codeine-side-effects.html