Some persons have difficulty swallowing tablets or capsules, or sometimes take medications without liquid. Tablets or capsules that stay in the esophagus
may release chemicals that can irritate the lining of the esophagus. This may cause ulcers, bleeding, perforation, and narrowing (strictures) of the esophagus.Also,Iron may interfere with the action of the sphincter muscle, located between the esophagus and stomach. This muscle allows the passage of food into the stomach after swallowing. This can increase the chances of reflux, or backup of the stomach's acidic contents into the esophagus. That's,the reason why it's better not to lay down on bed for about 30 minutes after taking Iron.
Wish you Best of your Health.