What Is Aurobindo's Clonazepam?
Aurobindo Pharma manufactures generic clonazepam tablets in strengths of 0.5 mg, 1 mg, and 2 mg, approved by the FDA as bioequivalent to Roche's Klonopin.[1] These are immediate-release oral tablets used for seizure disorders and panic disorder.
Key Formulation Modifications from Brand Klonopin
Aurobindo's version uses the same active ingredient, clonazepam, at identical strengths. Inactive ingredients differ slightly for manufacturing and stability:
- Excipients: Includes lactose monohydrate, microcrystalline cellulose, pregelatinized starch, sodium starch glycolate, magnesium stearate (in core tablet).
- Coating: Hypromellose, talc, polyethylene glycol, titanium dioxide, plus colorants like FD&C Blue #2 (0.5 mg), FD&C Red #40 (1 mg), or iron oxide yellow/D&C Yellow #10 (2 mg).[2]
These changes ensure equivalence under FDA standards (AB rating), with no impact on absorption, efficacy, or safety. Lactose content is low (~50-100 mg/tablet), but patients with lactose intolerance should check labels.
Why These Changes?
Generic makers like Aurobindo adjust excipients to use cost-effective, widely available materials while meeting bioequivalence criteria (90% confidence interval of 80-125% AUC and Cmax vs. brand).[3] No proprietary modifications like extended-release; it's a standard IR tablet.
Patent and Approval Timeline
Aurobindo's ANDA (207201) was approved October 24, 2014.[1] Clonazepam patents expired long ago (original 1975; key patents ~1990s), enabling generics. No active Orange Book patents block Aurobindo's version.[4]
Patient-Reported Differences
Some users note minor cosmetic variances (e.g., shape: Aurobindo's are round, scored; Klonopin oval) or perceived taste from coating. FDA data shows no therapeutic differences; switchbacks are rare (0.1-0.5% rate).[5] Allergic reactions to dyes or lactose possible—consult pharmacist.
Competitors' Versions
| Manufacturer | Strengths | Notable Excipient Diff | FDA Approval |
|--------------|-----------|-------------------------|--------------|
| Aurobindo | 0.5,1,2 mg | Lactose-based | 2014[1] |
| Accord | 0.5,1,2 mg | Corn starch, no lactose| 2011 |
| Mylan (Viatris) | 0.5,1,2 mg | Anhydrous lactose | 1998 |
| Teva | 0.5,1,2 mg | Mannitol (lactose-free)| 2006[2] |
Choose based on allergies; all AB-rated.
[1]: FDA Orange Book - Clonazepam
[2]: DailyMed - Aurobindo Clonazepam
[3]: FDA Bioequivalence Guidance
[4]: DrugPatentWatch - Clonazepam
[5]: FDA Generic Approvals Database