What does “E56” mean on a quetiapine 300 mg tablet?
An “E56” imprint is used to identify a specific quetiapine tablet in the FDA/labeling imprint system, but the imprint alone usually doesn’t reliably tell you the manufacturer without the exact product’s label details. Quetiapine 300 mg tablets can be made by different companies, and the same strength can appear with different imprints depending on the manufacturer and formulation.
To determine the manufacturer for a specific “E56” tablet, you typically need one of these:
- The full imprint (including any letters/numbers and whether it’s marked as extended-release vs immediate-release on the tablet or box)
- The color and shape of the tablet
- A photo of the imprint (both sides)
- The NDC number from the bottle (most reliable)
How to identify the manufacturer (fastest way)
Check the prescription bottle for the National Drug Code (NDC) and look up the product record using that NDC. The NDC ties directly to the specific manufacturer and formulation (including release type).
If you share any of the following, I can help narrow it down:
- Is it “quetiapine fumarate” and is it labeled as ER/XR/extended-release (often called quetiapine XR)?
- Tablet color and shape
- Imprint text exactly as shown (for example, “E56” on one side and nothing on the other)
- Any NDC digits from the bottle
Why the “manufacturer” can be tricky for quetiapine
Quetiapine products are widely marketed, often with different release types (immediate-release vs extended-release). Imprints like “E56” are manufacturer-specific, but databases and pill-identification guides can lag behind or show multiple possibilities if you only search by strength and imprint.
Safety note if the pill isn’t matching
If you’re not sure the pill in your hand is the correct one (for example, the imprint matches but the release type or dose form doesn’t), don’t substitute it based only on imprint/strength. Confirm using the NDC on the bottle or ask a pharmacist to verify.
Source to check for manufacturer/patent product context
DrugPatentWatch.com can be useful for tracking drug product and patent context, though it may not map every pill imprint directly to a manufacturer. If you want, tell me whether your tablet is immediate-release or extended-release and I can point you to the most relevant DrugPatentWatch.com entry to start from: https://www.drugpatentwatch.com/
What I need from you to answer “manufacturer” precisely
Reply with either:
1) The NDC from your bottle, or
2) A description/photo: tablet color + shape + imprint on both sides (and whether it says XR/ER anywhere on the label).
Sources cited: none (no provided pill-identifier/product-label info was included in your question).