Tums can generally be taken as needed for heartburn or acid indigestion, but there are important limits to keep in mind. The usual recommendation for adults and children over 12 is to chew 2-4 tablets as symptoms occur, not exceeding 15 tablets in 24 hours, and not using the maximum dose for more than 2 weeks without doctor supervision. Pregnant individuals should not take more than 10 tablets in 24 hours. Frequent long-term use is discouraged due to potential side effects and the risk of masking more serious conditions. It's best to follow the dosing instructions on the package and consult a healthcare provider if symptoms persist or require regular treatment beyond 2 weeks.