FDA pharmacologic class
Cytochrome P450 2D6 Inhibitor
1 medicine is in FDA's class of cytochrome p450 2d6 inhibitors: quinidine; 1 combination product also contains one. All 2 are listed from generic labelers (FDA NDC Directory, October 8, 2026). The lowest pharmacy cost is quinidine gluc er 324 mg tablet at $4.92 per tablet (NADAC).
Which medicines are cytochrome p450 2d6 inhibitor?
| Medicine | Brand names | Generic labelers (all forms) | Pharmacy cost | Boxed warning | Shortage | Recalls since 2012 |
|---|---|---|---|---|---|---|
| Dextromethorphan and quinidine | Nuedexta | 4 labelers | $26.64 per capsule 20-10 mg capsule | No | No current entry | 1 |
| Quinidine | none listed | 4 labelers | $4.92 per tablet 324 mg tablet | Yes | No current entry | 1 |
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