FDA pharmacologic class
Sulfonamide Antibacterial
3 medicines are in FDA's class of sulfonamide antibacterials: sulfacetamide (Klaron), silver sulfadiazine (Ssd) and sulfadiazine; 1 combination product also contains one. 3 of the 4 are listed from generic labelers (FDA NDC Directory, October 8, 2026). The lowest pharmacy cost is sodium sulfacetamide 10% wash at $0.110 per gram (NADAC).
Which medicines are sulfonamide antibacterial?
| Medicine | Brand names | Generic labelers (all forms) | Pharmacy cost | Boxed warning | Shortage | Recalls since 2012 |
|---|---|---|---|---|---|---|
| Sulfacetamide | Klaron | 7 labelers | $0.110 per gram 10% wash | No | No current entry | 1 |
| Silver sulfadiazine | Ssd, Silvadene, Thermazene | none listed | $0.260 per gram 1% cream | No | No current entry | 0 |
| Prednisolone and sulfacetamide | none listed | 2 labelers | $2.62 per mL 10-0.23% eye drops | No | No current entry | 0 |
| Sulfadiazine | none listed | 2 labelers | $15.06 per tablet 500 mg tablet | 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