What does “E56” mean on quetiapine tablets?
In the imprint code system used in the US, “E56” is an identifier printed on some quetiapine-containing tablets. The imprint itself is meant to help people match the exact medication to a specific product, but the manufacturer can vary by strength and by the specific marketed product that uses that imprint.
Because imprint codes are assigned to specific drug products, the same active ingredient (quetiapine) can have different imprint codes depending on the manufacturer and strength.
Which company makes quetiapine with imprint “E56”?
You can only answer this reliably by matching “E56” to the specific quetiapine strength and dosage form shown on the tablet bottle or label (for example, tablet strength like 25 mg, 50 mg, 100 mg, XR vs immediate-release). Imprint-to-manufacturer mapping is product-specific, and “E56” alone isn’t enough to determine the manufacturer without the rest of the identifying details.
If you share:
- the exact imprint text (including any letters/numbers around it),
- the tablet strength (mg),
- whether it says XR or is immediate-release,
- and the tablet shape/color,
I can help narrow to the exact product that uses “E56.”
How to confirm the manufacturer yourself (fastest safe method)
The most dependable way to confirm who manufactured your specific quetiapine is to check:
- the pharmacy label (often lists the manufacturer or “NDC” indirectly),
- the NDC number printed on the bottle (best), and then match that NDC to the imprint,
- or a medication database lookup using the imprint plus strength.
Is it safe to take quetiapine if the imprint manufacturer is different than expected?
Quetiapine is a prescription medicine, so switching to a different manufacturer is usually not a problem if it is the same drug, same formulation (IR vs XR), and the same strength. The key safety checks are:
- same active ingredient (quetiapine),
- same formulation (immediate-release vs extended-release),
- same strength,
- and correct dosing instructions on your prescription.
If any of those don’t match, don’t take it until a pharmacist verifies it.
If you want, I can identify it precisely
Send the details you see on the tablet/bottle:
1) imprint (exactly as printed, e.g., “E56” plus any other text)
2) strength (mg)
3) IR or XR
4) color and shape
5) (optional but best) the NDC from the bottle
Then I can tell you which manufacturer corresponds to that exact quetiapine product.