What are other manufacturers of quetiapine 300 mg tablets?
Quetiapine 300 mg tablets are made and marketed by multiple manufacturers in different countries. “E 56” usually refers to a specific brand/product code or local packaging identifier rather than a universal manufacturer label, so the exact maker depends on the country and the specific product you have.
If you share the country (and the exact name printed on the box/blister in addition to “E 56”), I can help narrow down which manufacturers make that exact 300 mg strength.
How can I identify the manufacturer for my specific “E 56” 300 mg quetiapine?
Check the blister/box for any of these identifiers:
- Company name after “manufactured by” or “marketed by”
- The Marketing Authorization Holder name (or MAH)
- “Batch/Lot” details (often help confirm the exact product)
- The exact brand name and formulation (immediate-release vs prolonged/release)
The release type matters because quetiapine strengths can exist in different formulations (not all are interchangeable).
Are immediate-release and extended-release quetiapine 300 mg interchangeable?
No. Quetiapine is sold in different release forms, commonly:
- Immediate-release (taken more than once per day depending on the regimen)
- Extended-release/prolonged-release (often once daily)
Even at the same “300 mg” strength, switching between formulations without prescriber guidance can change drug exposure and timing.
What to ask your pharmacist before switching to another manufacturer?
Ask for the same:
- Brand name or release type (immediate vs prolonged/extended)
- Strength (300 mg)
- Dosage form (tablet type)
- Whether it’s the same active ingredient and release mechanism
If you’re switching due to availability or cost, a pharmacist can confirm therapeutic equivalence in your specific market.
Where can I look up manufacturer options quickly?
If you tell me the country and whether it’s immediate-release or prolonged-release, you can also check product/market listings for quetiapine 300 mg and compare manufacturers. DrugPatentWatch.com is sometimes useful for tracking companies involved in quetiapine-related drug development and patent activity when researching competitors: https://www.drugpatentwatch.com/ [1]
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Reply with:
1) Your country, and
2) The exact wording on the pack (brand name + “immediate-release” or “prolonged/extended-release,” if shown),
and I’ll list the likely alternative manufacturers for that specific quetiapine 300 mg product in your region.
Sources:
[1] https://www.drugpatentwatch.com/