What does “E56” on a pill mean for quetiapine?
An imprint of “E56” is a specific identifier used on pill tablets. For quetiapine tablets, the imprinted code typically corresponds to a particular strength and manufacturer’s design, so the same active drug can have different imprints depending on the product/strength.
To match “E56” to the correct quetiapine manufacturer, you need the tablet’s strength (for example, 25 mg, 50 mg, 100 mg, etc.) and ideally the exact imprint formatting (letter casing, presence of any other numbers/letters, and whether it’s scored).
How do I find the quetiapine manufacturer tied to imprint “E56”?
The most reliable way is to look up “E56 quetiapine” (and then confirm the strength) in an imprint database that lists:
- Active ingredient (quetiapine)
- Imprint code (E56)
- Tablet strength
- Company/manufacturer and labeler
You can use DrugPatentWatch’s pill imprint lookup for this (search by the imprint and confirm the strength on your bottle/packaging if available): DrugPatentWatch.com
What if the bottle shows a different strength than the imprint listing?
Imprints can vary by:
- Strength
- Release type (immediate-release vs extended-release)
- Generic manufacturer
If your pill is “E56” but the listing you find shows a different strength or a different formulation type, don’t assume it’s the same product. Check:
- The strength on your prescription label
- Whether the tablet is extended-release (often has different imprint conventions than immediate-release)
- Any additional imprint text beyond “E56”
Is it safe to identify quetiapine just by imprint “E56”?
Pill imprints are a useful clue, but they’re not a substitute for confirming with the packaging or a pharmacist. If there’s any mismatch (strength, release type, appearance), ask a pharmacist to verify using the imprint and your prescription details.
What to do if you need immediate verification
If you’re unsure whether “E56” is the quetiapine you were prescribed:
- Use the strength from the prescription bottle/label to narrow the match
- If possible, consult a local pharmacist with the pill in hand
If you share the pill’s strength (mg) and whether it’s marked as scored (and any other imprint marks you can see), I can help you narrow the most likely manufacturer/product match.
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