Yes, you shouldn’t take them together.. meaning not at the same time. try to space them at least 4 hours from each other.. but you can use them within the same day.. make sense??
As far as the timing the prevacid.. what form are you using? If it’s the solutabs, then yes, you need to wait at least 30 minutes before feeding, so that the med is absorbed into the body. If you feed too early, the food will block the meds. absorption (that’s a very rough explanation).