What the FDA labels say about taking them together
Dronedarone and ritonavir
Dronedarone's FDA label of May 29, 2025 names ritonavir in its contraindications section, and ritonavir's label names dronedarone too. The ritonavir label: “Contraindicated due to potential for cardiac arrhythmias.”
Check it at the source: the dronedarone FDA label on DailyMed (effective May 29, 2025, Sanofi-Aventis U.S. LLC); the ritonavir FDA label on DailyMed (effective July 23, 2026, AbbVie Inc.).
What does the dronedarone label say about ritonavir?
Dronedarone label, contraindications… (except when used in conjunction with a functioning pacemaker) Bradycardia <50 bpm Concomitant use of strong CYP3A inhibitors, such as ketoconazole, itraconazole, voriconazole, cyclosporine, telithromycin, clarithromycin, nefazodone, and ritonavir [see Drug Interactions (7.2) ] Concomitant use of erythromycin [see Clinical Pharmacology (12.3) ] Concomitant use of drugs or herbal products that prolong the QT interval and might increase the risk of torsade de pointes, such as phenothiazine antipsychotics, tricyclic antidepressants, certain oral macrolide antibiotics, and Class I and III antiarrhythmics Liver or lung toxicity related to the previous use of amiodarone QTc interval >500 ms or PR …
Dronedarone label, drug interactionsDrugs on Dronedarone Ketoconazole and Other Potent CYP3A Inhibitors Concomitant use of ketoconazole as well as other potent CYP3A inhibitors such as itraconazole, voriconazole, ritonavir, clarithromycin, and nefazodone is contraindicated because exposure to dronedarone is significantly increased [see Contraindications (4), Clinical Pharmacology (12.3) ].
Source: FDA drug label (Multaq), Sanofi-Aventis U.S. LLC, effective May 29, 2025 (SPL set 7fa41601-7fb5-4155-8e50-2ae903f0d2d6), via openFDA; the full label on DailyMed
What does the ritonavir label say about dronedarone?
Ritonavir label, contraindicationsNORVIR is contraindicated with drugs that are highly dependent on CYP3A for clearance and for which elevated plasma concentrations are associated with serious and/or life-threatening reactions [see Drug Interactions ( 7.1 ) and Clinical Pharmacology ( 12.3 )]. ○ Alpha 1- Adrenoreceptor Antagonist: alfuzosin ○ Antianginal: ranolazine ○ Antiarrhythmics: amiodarone, dronedarone, flecainide, propafenone, quinidine ○ Antifungal: voriconazole ○ Anti-gout: colchicine ○ Antipsychotics: lurasidone, pimozide ○ Ergot Derivatives: dihydroergotamine, ergotamine, methylergonovine ○ GI Motility Agent: cisapride ○ HMG-CoA Reductase Inhibitors: lovastatin, simvastatin ○ Microsomal triglyceride transfer …
Ritonavir label, drug interactionsConcomitant Drug Class/Drug Name: Antiarrhythmics: amiodarone, dronedarone, flecainide, propafenone, quinidine; Effect on Concentration of Ritonavir or Concomitant Drug: ↑ antiarrhythmics; Clinical Comment: Contraindicated due to potential for cardiac arrhythmias [see Contraindications () ].
Source: FDA drug label (Norvir), AbbVie Inc., effective July 23, 2026 (SPL set 2849298e-de6e-47bb-8194-56e075b33fc3), 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
| Dronedarone | Ritonavir | |
|---|---|---|
| Labeled for | n/a | HIV |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | $13.19 per tablet 400 mg tablet | $0.607 per tablet 100 mg tablet |
| Shortage now | No current entry | A presentation being discontinued |
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