FDA pharmacologic class
Nitroimidazole Antimicrobial
4 medicines are in FDA's class of nitroimidazole antimicrobials: metronidazole (Flagyl), tinidazole (Tindamax), fexinidazole and secnidazole (Solosec); 1 combination product also contains one. 3 of the 5 are listed from generic labelers (FDA NDC Directory, October 8, 2026). The lowest pharmacy cost is metronidazole 250 mg tablet at $0.102 per tablet (NADAC).
Which medicines are nitroimidazole antimicrobial?
| Medicine | Brand names | Generic labelers (all forms) | Pharmacy cost | Boxed warning | Shortage | Recalls since 2012 |
|---|---|---|---|---|---|---|
| Metronidazole | Likmez, Nuvessa, Noritate | 55 labelers | $0.102 per tablet 250 mg tablet | Yes | In shortage | 7 |
| Tinidazole | Tindamax | 5 labelers | $2.35 per tablet 500 mg tablet | Yes | No current entry | 0 |
| Bismuth subcitrate and metronidazole and tetracycline | Pylera | 2 labelers | $2.40 per capsule 140-125-125 mg capsule | Yes | No current entry | 0 |
| Fexinidazole | none listed | none listed | n/a | No | No current entry | 0 |
| Secnidazole | Solosec | none listed | $281.96 per packet 2 g granule packet | 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