Prevacid is used to treat Ulcers. The generic version is called Lansoprazole. The average Prevacid cash price is about $276.80 for a supply of Capsule Delayed Release 30 MG 30 pcs. You can reduce your Prevacid cost by up to 75% with our free Prevacid discount card. Bring it to a participating pharmacy near you to save on your prescription medication.