What the FDA labels say about taking them together
Maribavir and rifabutin
Maribavir's FDA label of January 27, 2026 names rifabutin in its drug interactions section; the rifabutin label PlainMeds reads does not name maribavir. The maribavir label: “With moderate CYP3A4 inducers rifabutin (antimycobacterial) and phenobarbital (anticonvulsant), a dose adjustment is recommended.”
Check it at the source: the maribavir FDA label on DailyMed (effective January 27, 2026, Takeda Pharmaceuticals America, Inc.); the rifabutin FDA label on DailyMed (effective September 1, 2026, REMEDYREPACK INC.).
What does the maribavir label say about rifabutin?
Maribavir label, drug interactionsWhen coadministered with the moderate CYP3A4 inducers rifabutin (antimycobacterial) or phenobarbital (anticonvulsant), a dose adjustment is recommended.
Maribavir label, warnings and precautionsWith moderate CYP3A4 inducers rifabutin (antimycobacterial) and phenobarbital (anticonvulsant), a dose adjustment is recommended [see Dosage and Administration (2.2 , 2.3) and Drug Interactions (7.3) ].
Source: FDA drug label (Livtencity), Takeda Pharmaceuticals America, Inc., effective January 27, 2026 (SPL set c94fc2c5-e840-4f18-b7d8-d5eacb26d3a0), via openFDA; the full label on DailyMed
What does the rifabutin label say about maribavir?
Rifabutin's label (effective September 1, 2026) does not name maribavir in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Rifabutin), NDA050689 (Pfizer), as published by REMEDYREPACK INC., effective September 1, 2026 (SPL set 25a60937-cbbe-4a50-994f-2ce15203f589), 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
| Maribavir | Rifabutin | |
|---|---|---|
| Labeled for | n/a | n/a |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | n/a | $8.14 per capsule 150 mg capsule |
| 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