My husband takes Potassium Citrate 2 pills twice a day. Was off meds this med 2 weeks before a 24 hour urine collection. Started back on pills 5 days ago (only change in meds, no change in diet). Since restarting K+ Onset of extreme burning & soreness inside lips, mouth mucosa, & tongue (similar to scalding coffee, etc). Appears redder than normal, no blisters but difficult to eat. Only other change is a replacement tooth retainer for dental implants.