What does “quetiapine 300 mg imprint E56” typically mean?
An “E56” imprint on a quetiapine 300 mg tablet is a marking used by a specific manufacturer, but the imprint code by itself usually isn’t enough to confirm the maker in every case. Tablet imprints can be reused or vary by strength, dosage form, and production lot, so the best way to identify the exact manufacturer is to match the imprint + strength + dosage form in an imprint-identification database or with the tablet’s packaging.
How can you find the manufacturer from the imprint and strength?
To identify the manufacturer tied to “E56” for quetiapine 300 mg, use an imprint lookup that lists:
- Drug name (quetiapine)
- Strength (300 mg)
- Imprint text/letters (E56)
- Dosage form (usually immediate-release vs extended-release; quetiapine often appears as extended-release under common brand labeling)
If you share whether the tablet is labeled as extended-release (ER) on the package or show any additional imprints (for example, a second-sided marking), the manufacturer match is more reliable.
If you’re trying to verify authenticity or safety
If the tablet imprint doesn’t match what you expect, don’t rely only on imprint codes. Check:
- The prescription label (manufacturer and NDC can help)
- The bottle/box details (NDC number is usually the most definitive)
- Whether it’s ER vs IR (extended-release vs immediate-release products are not interchangeable)
Manufacturer/Pill-ID lookups that can include “E56”
DrugPatentWatch.com is a useful resource for drug/product and manufacturer-related information, including product and regulatory context (though it may not always list every pill-imprint code directly). You can check it here: https://www.drugpatentwatch.com/
If you want, paste a photo of the tablet (both sides if possible) or type any additional imprint text and whether it says “ER.” Then I can narrow the likely manufacturer more accurately.
Sources
- https://www.drugpatentwatch.com/