What the FDA labels say about taking them together
Gabapentin and levorphanol
Levorphanol's FDA label of January 13, 2026 names gabapentin in its drug interactions section; gabapentin's label does not name levorphanol itself but warns about its class (Opioids (opioid agonists)). The levorphanol label: “… and tranquilizers, muscle relaxants, general anesthetics, antipsychotics, gabapentinoids (gabapentin or pregabalin), and other opioids, including alcohol, can increase the risk of hypotension, respiratory depression …”
Check it at the source: the gabapentin FDA label on DailyMed (effective May 12, 2026, Viatris Specialty LLC); the levorphanol FDA label on DailyMed (effective January 13, 2026, Sun Pharmaceutical Industries, Inc.).
What does the gabapentin label say about levorphanol?
Gabapentin's label does not name levorphanol itself; it warns about its class (Opioids (opioid agonists)):
Gabapentin label, warnings and precautionsThere is evidence from case reports, human studies, and animal studies associating gabapentin with serious, life-threatening, or fatal respiratory depression when coadministered with CNS depressants, including opioids, or in the setting of underlying respiratory impairment.
Gabapentin label, warnings and precautionsThere is evidence from case reports, human studies, and animal studies associating gabapentin with serious, life-threatening, or fatal respiratory depression when co-administrated with central nervous system (CNS) depressants, including opioids, or in the setting of underlying respiratory impairment.
Source: FDA drug label (Neurontin), Viatris Specialty LLC, effective May 12, 2026 (SPL set 97935fd9-1d4a-43b6-a5d9-de994591187b), via openFDA; the full label on DailyMed
What does the levorphanol label say about gabapentin?
Levorphanol label, drug interactionsDrug Interactions Benzodiazepines and Other Central Nervous System (CNS) Depressants Due to additive pharmacologic effect, the concomitant use of benzodiazepines and other CNS depressants, such as benzodiazepines, and other sedative hypnotics, anxiolytics, and tranquilizers, muscle relaxants, general anesthetics, antipsychotics, gabapentinoids (gabapentin or pregabalin), and other opioids, including alcohol, can increase the risk of hypotension, respiratory depression, profound sedation, coma, and death.
Levorphanol label, warningsRisks from Concomitant Use with Benzodiazepines or Other CNS Depressants Profound sedation, respiratory depression, coma, and death may result from the concomitant use of levorphanol tartrate tablets with benzodiazepines and/or other CNS depressants, including alcohol (e.g., non-benzodiazepine sedatives/hypnotics, anxiolytics, tranquilizers, muscle relaxants, general anesthetics, antipsychotics, gabapentinoids [gabapentin or pregabalin], and other opioids).
Source: FDA drug label (Levorphanol Tartrate), Sun Pharmaceutical Industries, Inc., effective January 13, 2026 (SPL set 438cf3ea-04fe-4626-9f0f-adcda7633651), 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
| Gabapentin | Levorphanol | |
|---|---|---|
| Labeled for | Nerve pain and fibromyalgia, Seizures and epilepsy | Pain |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $0.0218 per capsule 100 mg capsule | $10.65 per tablet 2 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