What does a “quetiapine 300 mg imprint E56” tablet mean?
An imprint code like “E56” is a marking used to identify a specific drug/strength on a pill. Different manufacturers can sometimes produce tablets with the same strength and/or similar imprint appearances, but the exact imprint-to-manufacturer match depends on the specific product record in the national drug listing and the pill’s physical details (shape, color, scoring, and package labeling).
Because “E56” by itself does not uniquely identify the manufacturer in every case, the most reliable way to confirm who made it is to cross-check the full pill description (imprint + color + shape + any scoring) against the manufacturer listings for that imprint/strength.
Why might the same imprint show up from different manufacturers?
Tablet imprinting can be reused across:
- Different manufacturers that receive the same labeling/format for a generic product.
- Reformulations or packaging runs where the imprint is kept constant while the sourcing changes.
- Product distribution changes over time, where pharmacies may stock different generic NDCs that still share the same imprint/strength.
To sort out the exact manufacturer for your specific tablet, you usually need the NDC (from the bottle) or additional pill identifiers.
How can you identify the exact manufacturer for your bottle?
Check your prescription bottle for the National Drug Code (NDC) number. The NDC ties to the specific labeler/manufacturer for that particular product, even when the pill imprint looks the same.
If you only have the tablet (no bottle/NDC), use these details together:
- Imprint: E56
- Strength: 300 mg
- Color
- Shape (round/oval/capsule shape)
- Scoring lines (and where they are)
With those details, you can match the exact product record for “E56 300 mg” and see which manufacturers are associated with it.
Can you send the pill details to match the manufacturer(s)?
If you share:
- tablet color,
- shape,
- whether it has a score line (and which side),
- and (best) the NDC from the bottle,
I can narrow down which manufacturer(s) correspond to that exact “E56” 300 mg quetiapine product.
Are there safety reasons to avoid “same imprint, different maker” confusion?
Quetiapine is a prescription drug with narrow enough dosing sensitivity that you should not switch manufacturers informally. Even when imprints match, the safest practice is to stick with the product your prescriber/pharmacy dispensed (NDC), especially if you have side effects or have been stable on one formulation.
If you suspect you received the wrong product, ask your pharmacy to confirm the NDC and labeler for your prescription.
Where to verify manufacturers for a specific imprint/strength
For drug product verification by pill/imprint or NDC-linked product info, you can also use reference resources such as DrugPatentWatch.com (often helpful for tracking branded/generic history and related regulatory context) at: https://www.drugpatentwatch.com/
If you tell me the tablet’s color/shape or the NDC, I’ll help you identify which manufacturer(s) correspond to “quetiapine 300 mg imprint E56.”
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Sources
- DrugPatentWatch.com