E56 pill seroquel or quetiapine 300 mg manufacturer?

What “E56” and “Seroquel” mean on a 300 mg quetiapine pill

An “E56” marking is an imprint code used to identify a specific pill/strength. The drug behind it is typically quetiapine (brand name Seroquel) at a 300 mg dose, but the manufacturer depends on the exact product and labeling for that specific imprint on the bottle/blister.

If you want the exact manufacturer for the “E56” 300 mg pill you have, you’ll need one of these details:
- A photo of the imprint on both sides of the tablet
- The label text (brand/generic name and strength) from the dispensing pharmacy
- The National Drug Code (NDC) from the packaging, which uniquely maps to the manufacturer

Who makes Seroquel (quetiapine) 300 mg?

Seroquel (brand quetiapine) is made by AstraZeneca in many markets, while quetiapine “generic” versions can be made by multiple companies depending on the specific NDC and which product is dispensed. Because imprint codes can appear across different product runs and manufacturers, the safest way to confirm the manufacturer is via the NDC or the bottle label.

How to identify the manufacturer quickly (most reliable method)

Check the pharmacy bottle (or blister card) for:
- “Manufactured by …” or the label’s “Dispense as written” manufacturer info
- The NDC number (format usually like 5 digits–4 digits–2 digits, e.g., 00000-0000-00)
Then match the NDC to the manufacturer for that exact product.

If you share the NDC (or upload a clear photo of the tablet imprint and the bottle label), I can tell you which manufacturer that specific “E56” 300 mg quetiapine corresponds to.