No black box warning on record for Alka-Seltzer Heartburn
As of the latest FDA labeling reviewed, Alka-Seltzer Heartburn (ANHYDROUS CITRIC ACID, SODIUM BICARBONATE (HEAT-TREATED)) does not carry a black box warning. Standard warnings and precautions still apply — see the full Alka-Seltzer Heartburn medicine page for the complete safety profile.