What the FDA labels say about taking them together
Chloroquine and dapsone
Dapsone's FDA label (Aczone) of October 23, 2025 names chloroquine in its drug interactions section; the chloroquine label PlainMeds reads does not name dapsone. The dapsone label: “… such as sulfonamides, acetaminophen, acetanilide, aniline dyes, benzocaine, chloroquine, dapsone, naphthalene, nitrates and nitrites, nitrofurantoin, nitroglycerin, nitroprusside, pamaquine, para‐aminosalicylic acid …”
Check it at the source: the chloroquine FDA label on DailyMed (effective July 2, 2026, Rising Pharma Holdings, Inc.); the dapsone FDA label on DailyMed (effective July 20, 2026, Macleods Pharmaceuticals Limited).
What does the chloroquine label say about dapsone?
Chloroquine's label (effective July 2, 2026) does not name dapsone in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Chloroquine Phosphate), Rising Pharma Holdings, Inc., effective July 2, 2026 (SPL set 06c69e2b-211b-4746-9f3a-f86d36520570), via openFDA; the full label on DailyMed
What does the dapsone label say about chloroquine?
Aczone label (Almirall, LLC, October 23, 2025), drug interactionsUse with Drugs that Induce Methemoglobinemia Concomitant use of ACZONE Gel, 7.5% with drugs that induce methemoglobinemia such as sulfonamides, acetaminophen, acetanilide, aniline dyes, benzocaine, chloroquine, dapsone, naphthalene, nitrates and nitrites, nitrofurantoin, nitroglycerin, nitroprusside, pamaquine, para‐aminosalicylic acid, phenacetin, phenobarbital, phenytoin, primaquine, and quinine may increase the risk for developing methemoglobinemia [see Warnings and Precautions ( 5.1 )].
Source: FDA drug label (Aczone, NDA207154), Almirall, LLC, effective October 23, 2025 (SPL set 22058b7d-a578-4eaa-a476-ac982337f02a), via openFDA
Source: FDA drug label (Dapsone, NDA021794), Pacific Pharma, Inc., effective September 30, 2018 (SPL set 8dbe1a41-6d9d-414f-aa9c-09bd95857e2a), via openFDA
Source: FDA drug label (Dapsone), Macleods Pharmaceuticals Limited, effective July 20, 2026 (SPL set 839d7440-ba0e-4c56-b648-d374b155cf03), 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
| Chloroquine | Dapsone | |
|---|---|---|
| Labeled for | n/a | Acne |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | $6.65 per tablet 500 mg tablet | $0.664 per gram 5% gel |
| 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