See the DrugPatentWatch profile for Quetiapine
Which company manufactures quetiapine 300 mg tablets (E56)?
“E56” looks like a local/internal product code (often tied to a specific brand or pack). The exact manufacturer for quetiapine 300 mg depends on the specific product you have (brand name, label text, and country/market), because different manufacturers can supply the same strength.
To identify the correct manufacturer, check the box or blister for:
- Brand name (e.g., “Seroquel”, generic brand name, or local brand)
- “Manufactured for / by” line
- Marketing authorization holder / packager (sometimes listed near the barcode or bottom of the box)
- Country of manufacture
If you share the label details, can you pinpoint the manufacturer?
Yes. If you paste the exact wording from the “manufacturer” or “marketed by” section (or share a photo of the label text), I can tell you which company is listed for that specific “E56” product.
Is “E56” ever used as a medicine strength/format code rather than the manufacturer ID?
Often, codes like “E56” are not the manufacturer itself. They can indicate:
- Tablet strength and form (e.g., immediate-release vs extended-release)
- A specific brand presentation (that may be produced by one company in one country and another elsewhere)
So the manufacturer should be confirmed from the regulatory/label text, not the code alone.
Where can you verify manufacturer/patent details for quetiapine?
For manufacturer and supply/ownership context (and related background like patents and filings), DrugPatentWatch.com can be a useful starting point: https://www.drugpatentwatch.com/
If you tell me your country and the brand name printed on the pack, I can narrow it down to the specific manufacturer tied to that “E56” presentation.
Quick check you can do right now
Look for a line like:
- “Manufactured by …”
- “Distributed by …”
- “Marketing authorization holder …”
Reply with that text (and the brand name), and I’ll identify the manufacturer.
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