What the FDA labels say about taking them together
Morphine and oxymorphone
Morphine's FDA label (Morphine Sulfate) of August 31, 2026 names oxymorphone in its drug interactions section; oxymorphone's label does not name morphine itself but warns about its class (Opioids (opioid agonists)). The morphine label: “MAOI interactions with opioids may manifest as serotonin syndrome or opioid toxicity.”
Check it at the source: the morphine FDA label on DailyMed (effective July 13, 2026, Bryant Ranch Prepack); the oxymorphone FDA label on DailyMed (effective June 29, 2026, Aurolife Pharma, LLC).
What does the morphine label say about oxymorphone?
Morphine Sulfate label (Fresenius Kabi, USA LLC, August 31, 2026), drug interactionsMonoamine Oxidase Inhibitors (MAOIs) Clinical Impact: MAOI interactions with opioids may manifest as serotonin syndrome or opioid toxicity (…). Intervention: Do not use Morphine Sulfate Injection in patients taking MAOIs or within 14 days of stopping such treatment. If urgent use of an opioid is necessary, use test doses and frequent titration of small doses of other opioids (such as oxycodone, oxymorphone, hydrocodone, or buprenorphine) to treat …
Source: FDA drug label (Morphine Sulfate, NDA204223), Fresenius Kabi, USA LLC, effective August 31, 2026 (SPL set 1f53de80-efc8-4930-b3e3-fba0d026af05), via openFDA
Source: FDA drug label (Morphine sulfate), ANDA078761 (Sun Pharm Inds Ltd), as published by Bryant Ranch Prepack, effective July 13, 2026 (SPL set 595243fe-a4b1-479a-99d6-a084a4181891), via openFDA; the full label on DailyMed
What does the oxymorphone label say about morphine?
Oxymorphone's label does not name morphine itself; it warns about its class (Opioids (opioid agonists)):
Oxymorphone label, warnings and precautionsLife-Threatening Respiratory Depression Serious, life-threatening, or fatal respiratory depression has been reported with the use of opioids, even when used as recommended.
Oxymorphone label, boxed warningSERIOUS AND LIFE-THREATENING RISKS FROM USE OF OXYMORPHONE HYDROCHLORIDE TABLETS Addiction, Abuse, and Misuse Because the use of oxymorphone hydrochloride tablets exposes patients and other users to the risks of opioid addiction, abuse, and misuse, which can lead to overdose and death, assess each patient’s risk prior to prescribing and reassess all patients regularly for the development of these behaviors and conditions [see Warnings and Precautions (5.1)].
Source: FDA drug label (Oxymorphone Hydrochloride), Aurolife Pharma, LLC, effective June 29, 2026 (SPL set 22c7652a-aa16-4fa8-89d9-517e69059068), 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
| Morphine | Oxymorphone | |
|---|---|---|
| Labeled for | Pain | Pain |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | $0.226 per tablet 15 mg tablet | n/a |
| Shortage now | In shortage | 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