http://www.drugs.com/xq/cfm/pageID_1150/int_0/qx/index.htm
Copy and paste it into you're browser and just put in all the meds you're currently taking and it'll answer your questions.
Neurontin and antidepressants are commonly prescribed together, so there should be no problem with that. Prilosec, I believe, would not be considered an antacid in the way I think that is meant for this purpose, but should double check with your pharmacist.