The difference is that the names are different as one is a trade name and the other is a generic name. The other difference is in the pricing. Prilosec is a brand name while Omerprazole is a usually...
Omeprazole refers to the drug substance itself, but can also mean any drug containing omeprazole. Omeprazole 20 mg ec likely refers to a specific finished pharmaceutical product (i.e. a drug product,...