What the FDA labels say about taking them together
Foscarbidopa/foslevodopa and phenelzine
Foscarbidopa/foslevodopa's FDA label of March 19, 2026 names phenelzine in its drug interactions section; the phenelzine label PlainMeds reads does not name foscarbidopa/foslevodopa. The foscarbidopa/foslevodopa label: “Oxidase (MAO) Inhibitors Nonselective MAO Inhibitors The use of nonselective MAO inhibitors with VYALEV is contraindicated.”
Check it at the source: the foscarbidopa/foslevodopa FDA label on DailyMed (effective March 19, 2026, AbbVie Inc.); the phenelzine FDA label on DailyMed (effective June 6, 2025, Parke-Davis Div of Pfizer Inc).
What does the foscarbidopa/foslevodopa label say about phenelzine?
Foscarbidopa/foslevodopa label, drug interactionsOxidase (MAO) Inhibitors Nonselective MAO Inhibitors The use of nonselective MAO inhibitors (e.g., phenelzine and tranylcypromine) with VYALEV is contraindicated [see Contraindications ( 4 ) ].
Source: FDA drug label (Vyalev), AbbVie Inc., effective March 19, 2026 (SPL set 28e806e4-951c-40a9-9f0c-d0929caf054c), via openFDA; the full label on DailyMed
What does the phenelzine label say about foscarbidopa/foslevodopa?
Phenelzine's label (effective June 6, 2025) does not name foscarbidopa/foslevodopa 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
| Foscarbidopa/foslevodopa | Phenelzine | |
|---|---|---|
| Labeled for | Parkinson's disease | n/a |
| Boxed warning | No | 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