What does “E 56 imprint” mean on a 300 mg quetiapine tablet?
An imprint like “E 56” is used to identify a specific version of a drug tablet (same active ingredient and strength, but possibly made by a particular manufacturer or packed under a specific label). Quetiapine 300 mg is most commonly sold as immediate-release or extended-release tablets, and the imprint alone doesn’t tell you the formulation type.
To identify “other manufacturers,” you typically need to confirm:
- the exact imprint text (including whether it’s on one side or both),
- whether it’s an “immediate-release” vs “extended-release” quetiapine product,
- and the tablet’s packaging/label details.
How to find other manufacturers for quetiapine 300 mg with different imprints
You can compare manufacturer imprints from reliable pill-identifier listings, using the combination of:
- drug name: quetiapine
- strength: 300 mg
- imprint: E 56
- any additional markings (letter/number, shape, scoring)
- release type (XR/ER vs IR), if shown anywhere on the tablet or bottle
If you tell me whether the tablet is marked “XR”/“ER” (or share the full imprint and whether it’s one or two sides), I can narrow down the likely product and point you to the right set of equivalent manufacturers.
Quick safety check before switching manufacturers
If you’re considering switching to tablets from another manufacturer:
- Only switch if your prescriber/pharmacist confirms it’s the same formulation (IR vs XR/ER) and strength.
- Different manufacturers can look different even at the same dose; an imprint mismatch can also mean it’s not the same product.
If you share the exact imprint text as it appears (including side/shape) and whether your prescription is for XR/IR, I can help identify what other manufacturer imprints correspond to 300 mg quetiapine.
Are you trying to replace “E 56” because of shortage or cost?
If your goal is availability or cheaper sourcing, the most practical route is:
- ask the pharmacy for “quetiapine 300 mg” of the same release type,
- ask what generic NDCs/manufacturer brands they carry that match your pill’s release type.
Because you asked specifically about “other manufacturers,” the key missing detail is whether your E 56 tablet is immediate-release or extended-release.
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If you reply with the full imprint (exact characters) and whether it’s XR/ER or IR (often listed on your prescription bottle), I’ll list the other manufacturer options that correspond to quetiapine 300 mg for that same product type.