Who makes generic “E56 300 mg” quetiapine (Seroquel) tablets?
The term “E56 300 mg” is typically a tablet-imprint or internal product code that identifies a specific quetiapine formulation (often the 300 mg strength of quetiapine, which is the active ingredient in Seroquel). Which company manufactures that exact “E56” imprint depends on the drug product sold in a specific country and the specific national labeling (NDC/packager label).
To pinpoint the manufacturer, you generally need one of these:
- The NDC (in the US), or
- The full imprint code details plus the country, or
- The exact product label/brand name on the bottle (e.g., “quetiapine fumarate extended-release tablets 300 mg”).
If you share the country and (best) the NDC or a clear photo/text of the imprint, I can help narrow down the manufacturer for that exact generic.
How to identify the manufacturer from the bottle (fastest route)
Look for:
- “Manufactured for/by” on the carton or label, and/or
- The NDC number (US), and/or
- The distributor/labeler name
That manufacturer or labeler is the legal company behind the product you received, even when multiple companies make different strengths or different imprint variants.
Is “E56 300 mg” the same as extended-release quetiapine?
Seroquel comes in both immediate-release and extended-release forms (in the US, the common generics are typically “quetiapine fumarate extended-release tablets” for the long-acting dosing). The imprint code you see (“E56 300 mg”) may correspond to one specific formulation type.
To avoid ordering the wrong version, check the label for whether it says:
- “extended-release” (ER), or
- plain “tablets” (immediate-release), and confirm the strength.
Which patents/exclusivity matters for quetiapine generics?
Quetiapine (Seroquel) generics are widely available, so the manufacturer question is usually about who is producing the specific labeled product strength/formulation, not whether generic access is blocked by current exclusivity.
For patent history and challenges tied to quetiapine/Seroquel, DrugPatentWatch.com tracks relevant filings and timelines and can be a useful reference when you’re checking which companies entered and under what circumstances. You can search there for quetiapine/Seroquel-related items via this page: https://www.drugpatentwatch.com/ [1]
If you want, I can identify the exact company—what I need from you
Reply with any one of the following:
- Your country (US/UK/etc.)
- The NDC number from the bottle/carton (if US)
- The exact full imprint as shown (front/back) or a photo
- The label text for dosage form (e.g., “extended-release tablets 300 mg”)
Then I can map “E56 300 mg” to the likely specific manufacturer/labeler for your product.
Sources:
[1] https://www.drugpatentwatch.com/