Is reglan (metoclopramide) an antacid?

No. Antacids are buffers that bind to acid in the stomach. They are available over the counter. Reglan (metoclopramide) is Metoclopramide which is a medication that is typically prescribed by a doctor and is used to promote stomach emptying in patients, typically diabetics. Nerve damage to the stomach may lead to gastroparesis in these patients which slows output from the stomach.

Related Questions

39 w preg. Volmit food and liquids. Allergic to zofran, reglan, (metoclopramide) tums, etc. Not ate or drank for 2-3 days. Ob won't do anything. Passed out sat?

Go to ER. You are probably significantly dehydrated and need IV fluids. Go to the er now.
Low fluid and BP. For a pregnant context, this seems threatening. You are about due to deliver. If you have not had food or drink for 2-3 days, then you are likely dehydrated and calorie deficient. Your baby may be threatened. Your fainting spell likely was either vaso-vagal or true low BP from fluid depletion. I recommend your go to an ER.