Consuming large quantities of Tums can lead to a dangerous calcium carbonate overdose, according to MedlinePlus. Symptoms include abdominal pain, confusion, irregular heartbeat, muscle twitching and coma. Adults should take no more than 15 Tums tablets in 24 hours, and pregnant women should take no more than 10, states DailyMed.
If an individual consumes too many Tums, immediately contacting the National Poison Control Center or local emergency number is recommended, explains MedlinePlus. Patients who overdose on Tums are typically taken to a hospital, where they are closely monitored and receive treatment for their symptoms. Since calcium carbonate is considered relatively nontoxic, full recovery from a Tums overdose is possible.