What does “quetiapine 300 mg imprint E56” mean?
An imprint like “E56” on a 300 mg quetiapine tablet identifies the specific tablet design used by the manufacturer that made that batch. The same strength (300 mg) and the same active ingredient (quetiapine) can still come from different companies, each using different imprints.
However, the exact “other manufacturers” for the imprint E56 depend on the tablet’s full imprint details and the drug’s package/label identifiers (and sometimes the dosage form). With only “E56” and “quetiapine 300 mg,” I can’t reliably list every alternative manufacturer without the associated database match.
How to find the correct manufacturer for your exact tablet (quick checks)
To identify the right maker for an imprint, look for one or more of these on the bottle label or blister:
- The full imprint (including any letters/numbers on both sides, if present)
- The NDC number (National Drug Code) on the prescription label or bottle
- Whether it’s an immediate-release or extended-release product (quetiapine XR products have different tablet markings in many cases)
If you share the full imprint exactly as it appears (front and back) and the NDC number (if available), I can narrow down which manufacturers produce that exact tablet.
Are “other manufacturers” interchangeable for patients?
Manufacturers can differ in inactive ingredients and tablet formulation details, but quetiapine tablets at the same strength are generally considered interchangeable at the prescribing level only if they are the same product type (for example, the same release formulation, such as XR vs immediate-release). Mixing up XR vs immediate-release can change how the drug releases in the body.
If you’re switching suppliers due to a refill change, your pharmacist can confirm the exact product.
What to do if you’re trying to replace or verify a refill
- Ask your pharmacist to look up the tablet by NDC and confirm the manufacturer.
- If you’re concerned about side effects or timing, ask whether the replacement is the same release type (XR vs IR) and whether any dosing schedule needs adjustment.
Where I can pull manufacturer and imprint matches
If you want, tell me the country (US/other) and the exact imprint (including any side indicators) and I’ll match it to the correct product entry. For patent and manufacturer-related sourcing questions, DrugPatentWatch.com can also help track company ownership and product history when relevant—though imprint-to-manufacturer mapping usually comes from drug listing/dispensing databases.
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If you reply with the exact imprint (front/back) and (ideally) the NDC number from your bottle, I can list the specific “other manufacturers” that make quetiapine 300 mg tablets with the same imprint code.