I took reglan years ago for much longer than I was supposed to (didn't have great oversight from doctor). It definitely helped (as long as I was taking a PPI as well), but I found that it did make very sleepy. I was supposed to take prior to eating each meal throughout the day. I only took it prior to dinner because I was so sleepy. That's the only side effect I noticed. Other than that, I never had a problem with it.
Current dx: Rheumatoid Arthritis
Suspected dx: UCTD/Early Lupus
Current Meds: Enbrel, Plaquenil, Aciphex, Ultracet, Zyrtec, Allavert-D, Zantac, Tylenol PM
Past Meds: Relafen, Vioxx, Mobic, Voltaren, Sulfasalazine, Entocort, Prednisone, Humira, Reglan