What should be avoided in an antacid if a patient suffers from constipation?

Aluminium hydroxide should be avoided in patients suffering from constipation because it has constipating effects. It works by neutralizing stomach acid, but one of the side effects associated with its use is that it can bind to gastric and intestinal contents, leading to slowed gastrointestinal motility. This can exacerbate constipation in individuals who are already experiencing difficulty with bowel movements.

In contrast, magnesium hydroxide is often used as an antacid and can actually produce a laxative effect, which may be beneficial for those with constipation. Sodium bicarbonate and calcium carbonate are generally less associated with causing constipation compared to aluminium hydroxide and are not primarily constipating. It is important to consider the side effects of different antacids when treating individuals with specific gastrointestinal issues.