How long does it take for a tums to start working after you take it?
Not Medical Advice: TUMS antacid starts working in seconds, because it dissolves quickly to neutralize stomach acid. It will work longer if you take it with food in your stomach.
Some side effects of using TUMS too much or too often are diarrhea, stomach cramps, and constipation. You shouldn't take more than 15 Regular Strength tablets in 24 hours, or take 15 tablets a day for more than 2 weeks.