Adrawback to the use of the antacid drugs sodium bicarbonate, alka-seltzer, and baking soda is their

Answer;
High content of sodium.

A drawback to the use of the antacid drugs sodium bicarbonate, alka-seltzer, and baking soda is their high sodium content.

Explanation;
Antacid drugs are weak bases that exert a therapeutic effect by neutralizing hydrochloric acid, thus relieving indigestion, heartburn and hyperacidity.  These antacids contain high levels of sodium which could make an individual unwell, especially those that have illness that needs them to control how much salt (sodium) they take in the diet. 

C) reflection (i also looked up the other choices just to make sure)