FDA pharmacologic class
Polymyxin-class Antibacterial
2 medicines are in FDA's class of polymyxin-class antibacterials: polymyxin b and colistimethate (Coly-Mycin); 8 combination products also contain one. All 10 are listed from generic labelers (FDA NDC Directory, October 8, 2026). The lowest pharmacy cost is triple antibiotic ointment at $0.111 per gram (NADAC).
Which medicines are polymyxin-class antibacterial?
| Medicine | Brand names | Generic labelers (all forms) | Pharmacy cost | Boxed warning | Shortage | Recalls since 2012 |
|---|---|---|---|---|---|---|
| Bacitracin and neomycin and polymyxin b | none listed | 1 labeler | $0.111 per gram Triple antibiotic ointment | No | No current entry | 0 |
| Hydrocortisone and neomycin and polymyxin b | none listed | 14 labelers | $5.09 per mL Neomycin-polymyxin-hc ear solution | No | No current entry | 0 |
| Dexamethasone and neomycin and polymyxin b | Maxitrol, Neo | 10 labelers | $1.78 per mL Neomyc-polym-dexameth eye drop | No | No current entry | 2 |
| Bacitracin and polymyxin b | Polycin | 3 labelers | $2.78 per gram Bacitracin-polymyxin eye ointment | No | No current entry | 0 |
| Polymyxin b and trimethoprim | none listed | 10 labelers | $0.452 per mL Polymyxin b-tmp eye drops | No | No current entry | 1 |
| Polymyxin b | none listed | 7 labelers | n/a | Yes | No current entry | 1 |
| Colistimethate | Coly-Mycin | 4 labelers | $15.49 per vial 150 mg vial | No | No current entry | 1 |
| Bacitracin, hydrocortisone, neomycin and polymyxin b | none listed | 1 labeler | $5.52 per gram Neo-bacit-poly-hc eye ointment | No | No current entry | 0 |
| Gramicidin and neomycin and polymyxin b | none listed | 2 labelers | $4.59 per mL Neomyc-polym-gramicid eye drop | No | No current entry | 0 |
| Neomycin and polymyxin b | none listed | 1 labeler | n/a | No | No current entry | 0 |
Source: FDA Established Pharmacologic Class (NDC Directory, openFDA); CMS NADAC of October 7, 2026; FDA shortages and recalls (FDA files October 8, 2026)
What do pharmacies pay?
Each medicine's most widely listed form, per unit, in the NADAC survey: what pharmacies paid, not what a patient pays; strengths differ, so compare like with like.
Source: CMS National Average Drug Acquisition Cost (NADAC) survey, October 7, 2026: what retail pharmacies paid per unit; not a counter price