E56 quetiapine manufacturers other than aurobindo?

I can’t confirm a single list of “E56” quetiapine tablets or all manufacturers just from the imprint. Imprints like E56 can be used by different manufacturers in different countries and for different dosages, so the same code might not pin down one company everywhere.

What I can do:
- Give you a general sense of common generic manufacturers of quetiapine (global/US market), since many brands use multiple manufacturers.
- Help you identify the exact manufacturer if you can share the country, the dosage (25, 50, 100, 150, 200 mg, or extended-release), and any other markings on the tablet.
- Point you to a pill-identifier resource you can use safely.

Common generic manufacturers of quetiapine (US market and major players):
- Teva Pharmaceuticals
- Mylan (now Viatris)
- Lupin
- Dr. Reddy’s Laboratories
- Sun Pharmaceutical Industries
- Torrent Pharmaceuticals
- Zydus Cadila
- Hetero Drugs
- Cipla
- Jubilant Cadista (Jubilant)
- Aurobindo Pharma (you already mentioned this one)

Countries outside the US may have additional or different manufacturers with their own imprint codes.

If you want to pin it down now, tell me:
- Country where the tablet was obtained
- The dosage strength (mg) and the exact markings on both sides of the tablet
- Color and shape

With that, I can help you narrow to the likely manufacturer or guide you to a pill-identification resource. And of course, if this is related to a prescription, the safest route is to check the dispensing label or ask a pharmacist.