What the FDA labels say about taking them together
Acetaminophen/benzhydrocodone and phenelzine
Acetaminophen/benzhydrocodone's FDA label of January 7, 2025 names phenelzine in its drug interactions section; the phenelzine label PlainMeds reads does not name acetaminophen/benzhydrocodone. The acetaminophen/benzhydrocodone label: “MAOI interactions with opioids may manifest as serotonin syndrome or opioid toxicity. If urgent use of an opioid is necessary, use test doses and frequent titration of small doses to treat pain while closely monitoring …”
Check it at the source: the acetaminophen/benzhydrocodone FDA label on DailyMed (effective January 7, 2025, Zevra Therapeutics, Inc.); the phenelzine FDA label on DailyMed (effective June 6, 2025, Parke-Davis Div of Pfizer Inc).
What does the acetaminophen/benzhydrocodone label say about phenelzine?
Acetaminophen/benzhydrocodone label, drug interactionsMonoamine Oxidase Inhibitors (MAOIs) Clinical Impact: MAOI interactions with opioids may manifest as serotonin syndrome or opioid toxicity (…). If urgent use of an opioid is necessary, use test doses and frequent titration of small doses to treat pain while closely monitoring blood pressure and signs and symptoms of CNS and respiratory depression. Intervention: The use of APADAZ is not recommended for patients taking MAOIs or within 14 days of stopping such treatment. Examples: phenelzine, tranylcypromine, linezolid
Source: FDA drug label (APADAZ), Zevra Therapeutics, Inc., effective January 7, 2025 (SPL set 0590d4e5-7107-4015-a6a8-deac14265aa2), via openFDA; the full label on DailyMed
What does the phenelzine label say about acetaminophen/benzhydrocodone?
Phenelzine's label (effective June 6, 2025) does not name acetaminophen/benzhydrocodone in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Nardil), Parke-Davis Div of Pfizer Inc, effective June 6, 2025 (SPL set 513a41d0-37d4-4355-8a6d-a2c643bce6fa), via openFDA; the full label on DailyMed
These are the labels' own sentences. PlainMeds does not grade interactions; a pharmacist or prescriber can say what they mean for one person's medicines.
Both medicines on the record
| Acetaminophen/benzhydrocodone | Phenelzine | |
|---|---|---|
| Labeled for | Pain | n/a |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | n/a | $0.586 per tablet 15 mg tablet |
| Shortage now | No current entry | No current entry |
Source: FDA NDC Directory, CMS NADAC of October 7, 2026 and the FDA Drug Shortage Database (FDA files October 8, 2026)
What next?
- Check more medicines together
- up to five at once