Truvada is 100% effective as PrEP, or nearly so, as long as it is taken properly and there are good amounts of
drug in the system at the time of exposure.
Truvada is the main medicine that has been studied and recommended for PrEP. It is a combination of two drugs, tenofovir and emtricitabine. Maybe some things you read used these names, so you didn't see the Truvada brand name.
I don't know if taking PPI drugs interferes with effectiveness against PrEP.