What the FDA labels say about taking them together
Lithium and potassium iodide
Potassium iodide's FDA label of October 3, 2025 names lithium in its drug interactions (prescription label) section; the lithium labels PlainMeds reads (4) do not name potassium iodide.
Check it at the source: the lithium FDA label on DailyMed (effective December 23, 2025, Glenmark Pharmaceuticals Inc., USA); the potassium iodide FDA label on DailyMed (effective October 3, 2025, Anbex Inc.).
What does the lithium label say about potassium iodide?
Lithium's label (effective December 23, 2025) and its 3 other brand-application labels do not name potassium iodide in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Lithium Carbonate), Glenmark Pharmaceuticals Inc., USA, effective December 23, 2025 (SPL set 63b3790f-a9b5-47f4-bae1-ddf8b43c13c1), via openFDA; the full label on DailyMed
What does the potassium iodide label say about lithium?
Potassium iodide label, drug interactions (prescription label)Drug Interactions: Concurrent use with lithium or antithyroid drugs may potentiate the hypothyroid and goitrogenic effects of these medications.
Source: FDA drug label (IOSAT), Anbex Inc., effective October 3, 2025 (SPL set bab815ee-47ef-4c87-a60d-e0d7863ad871), 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
| Lithium | Potassium iodide | |
|---|---|---|
| Labeled for | Bipolar disorder | n/a |
| Boxed warning | Yes | No |
| Pharmacy cost (NADAC) | $0.104 per capsule 300 mg capsule | n/a |
| 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