Carbamazepine Formulations
No, carbamazepine does not come in 400 mg tablets in standard immediate-release formulations, but 400 mg extended-release tablets are available.
Available Formulations
Based on FDA labeling and clinical guidelines, carbamazepine is available in the following oral formulations 1:
Standard Tablets
- 200 mg tablets (immediate-release) - This is the standard tablet strength mentioned in FDA labeling 1
Extended-Release Formulations
- 400 mg extended-release tablets are available in multiple formulations:
Clinical Context
The 400 mg extended-release formulations were specifically developed to support twice-daily dosing rather than the traditional four-times-daily regimen required with immediate-release tablets 2, 3. These formulations demonstrate bioequivalence to each other and provide more stable plasma concentrations with reduced peak-to-trough fluctuations 2, 3.
Dosing Considerations from Guidelines
Initial dosing typically starts at 100 mg twice daily, with gradual titration 4. The 400 mg strength is used for maintenance therapy once therapeutic levels are established. Extended-release formulations at 400 mg twice daily (800 mg total daily dose) fall within the therapeutic range used in clinical trials 3.
Important caveat: If you're asking about immediate-release tablets specifically, only 200 mg tablets are standard. The 400 mg strength exists exclusively as extended-release formulations designed for sustained drug delivery.