What the FDA labels say about taking them together
Colistimethate and succinylcholine
Colistimethate's FDA label of January 12, 2026 names succinylcholine in its drug interactions section; the succinylcholine labels PlainMeds reads (2) do not name colistimethate.
Check it at the source: the colistimethate FDA label on DailyMed (effective January 12, 2026, Heritage Pharmaceuticals Inc. d/b/a Avet Pharmaceuticals Inc.); the succinylcholine FDA label on DailyMed (effective August 18, 2026, Hospira, Inc.).
What does the colistimethate label say about succinylcholine?
Colistimethate label, drug interactionsCurariform muscle relaxants (e.g., tubocurarine) and other drugs, including ether, succinylcholine, gallamine, decamethonium and sodium citrate, potentiate the neuromuscular blocking effect and should be used with extreme caution in patients being treated with Colistimethate for Injection, USP.
Source: FDA drug label (Coly-Mycin M, NDA050108), Par Health USA, LLC, effective June 8, 2026 (SPL set 6d6e13e2-dc33-4b7b-84d0-66146a57c552), via openFDA
Source: FDA drug label (COLISTIMETHATE SODIUM), Heritage Pharmaceuticals Inc. d/b/a Avet Pharmaceuticals Inc., effective January 12, 2026 (SPL set 6a335659-03b0-4a2d-9cd4-7dcf7da96fe6), via openFDA; the full label on DailyMed
What does the succinylcholine label say about colistimethate?
Succinylcholine's label (effective August 18, 2026) and its 1 other brand-application label do not name colistimethate in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (QUELICIN), Hospira, Inc., effective August 18, 2026 (SPL set fb08161e-7711-406d-e7b3-ea4515c07983), 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
| Colistimethate | Succinylcholine | |
|---|---|---|
| Labeled for | Bacterial infections | n/a |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $15.49 per vial 150 mg vial | n/a |
| 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