prevacid is so expensive and the medco website suggested asking my Dr. to see if it would be OK if I took Ranitidine HCL 300 MG Tablet.
I'm kind of horrified to hear that the website recommended Ranitidine as an alternative to Prevacid, as they are not even the same class of medications. Prevacid is a Proton Pump Inhibitor while Ranitidine is an H2-receptor agonist. Both can be effective but for a Medco website to recommend substituting an entirely different type of medication seems really inappropriate.
You would be much better off asking your doctor if you could take PrilosecOTC (generic Omeprazole) in place of Prevacid. They are the same class of drug and work in similar ways. PrilosecOTC is available without a prescription and and in a very inexpensive generic version but you may need to take more than the recommended dose, so definitely check with your doctor.