What does the imprint “E 56” on quetiapine 300 mg usually mean?
An imprint code like “E 56” typically identifies a specific tablet strength and manufacturer in the FDA’s drug-labeling/imprint systems, where the same drug strength can have different imprints depending on the company that made the pill and the product’s labeling history.
However, to say exactly which manufacturer “E 56” corresponds to for quetiapine 300 mg, I’d need the most direct identifying context from you.
Which details do you need to confirm the manufacturer?
Please check and share any of the following from the same tablet (or the bottle label):
- The imprint text exactly as shown (you wrote “E 56”—confirm spacing/case, e.g., “E 56” vs “E56”).
- Any other markings (score line, additional letters/numbers, or side of the tablet where the imprint appears).
- The tablet color and shape.
- Whether it’s immediate-release or extended-release (for quetiapine, this matters; many 300 mg tablets are extended-release).
- What the bottle says under “Manufacturer” and “NDC” (National Drug Code), if available.
Can you look it up using the NDC from the bottle?
If you have the bottle, the NDC number is the fastest way to identify the exact manufacturer and product. If you paste the NDC digits (you can omit personal info), I can help match it to the correct manufacturer for that exact product.
Is “quetiapine 300 mg E 56” a common extended-release strength?
Quetiapine 300 mg is commonly associated with extended-release formulations, and different ER manufacturers can use different imprints even at the same strength. That’s why “E 56” alone may not be enough without the tablet’s other identifiers (shape/color) or the NDC.
Safety note: don’t rely on imprint alone
If the tablet you have is for quetiapine, correct identification still matters for side effects and dosing timing (especially if it’s ER vs immediate-release). If you’re unsure, check with your pharmacist and bring the pill in if possible.
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If you reply with the tablet’s color/shape and any other imprint marks (or the NDC from the bottle), I can narrow down the manufacturer for “E 56” more precisely.