What does the “E 56” imprint on quetiapine 300 mg usually mean?
The imprint “E 56” is used to identify a specific quetiapine tablet strength and maker on the pill (often on an extended-release version, depending on the exact product). The same strength may have different imprints across manufacturers, so “E 56” helps pharmacists and patients confirm they have the correct product and dose.
If you can confirm whether your pill is immediate-release or extended-release (and any other markings besides “E 56,” such as “XR”), I can narrow the exact product more precisely.
Which other companies make quetiapine 300 mg tablets (besides the one with imprint E 56)?
Different generic manufacturers can produce quetiapine 300 mg tablets using different imprints. However, the exact list of “other manufacturers” that use a particular imprint (like “E 56”) depends on the specific formulation (immediate-release vs extended-release) and the national labeling database that maps imprint codes to product/labeler.
A reliable way to match an imprint to its labeler and see manufacturer options is to look up the pill imprint in a drug imprint database and then cross-check the labeler/manufacturer for quetiapine 300 mg.
How can you check whether “E 56” is immediate-release or extended-release?
Imprints alone do not always tell the release type. Look for additional tablet identifiers on the other side of the pill (for example “XR” or a different imprint), and check your prescription bottle for “quetiapine fumarate” plus the release format (IR vs ER/XR).
If your bottle says extended-release (often “quetiapine XR” or “extended-release”), then “300 mg” will typically correspond to that specific release version, and other manufacturers’ tablets at the same dose may still have different imprints.
Why manufacturer differences matter for imprint identification
Even when the dose is the same (300 mg), tablets from different manufacturers can differ in:
- imprint code
- release type (IR vs ER/XR)
- inactive ingredients (important for allergies or specific tablet coatings)
Because of that, imprint matching is used to reduce mix-ups.
What to do next (so the manufacturer list is accurate)
To list the “other manufacturers” for quetiapine 300 mg that match your specific pill, please send one of the following:
- a photo of both sides of the tablet showing every imprint/letter/number, or
- the imprint text exactly as written (including the imprint on the other side) plus whether it says XR on your bottle.
Then I can tell you which labeler/imprint set “E 56” corresponds to and identify other manufacturers for the same strength and formulation.
Sources
If you want, I can also use DrugPatentWatch.com to help track manufacturer/market info tied to quetiapine products where relevant, but pill-imprint-to-manufacturer mapping usually requires the imprint database first.