Different medications require different types of antacids, as prescribed.
During a recent community health education session, an elderly gentleman approached me with a concern. He explained that he worries his regular medications might damage his stomach, so he always insists on taking them with an antacid. If a doctor doesn’t prescribe one, he asks them to add it to his prescription. However, he recently started feeling constipated—and he didn’t know why.
This gentleman’s situation is a common issue in Taiwan. Many people worry that medications will harm their stomach, liver, or kidneys, and therefore hope to add antacids for protection. But did you know that if you don’t actually have a gastrointestinal problem, taking antacids indiscriminately can actually be harmful?
Antacids are medications that have therapeutic effects. Taking them when they aren’t needed can cause unnecessary side effects and may even lead to drug-drug interactions. Therefore, using antacids correctly is crucial!
Generally, antacids can be categorized into four types based on their function:
1. Neutralizing Stomach Acid (Antacids)
This is the most common type. Antacids are alkaline substances used to neutralize stomach acid. Short-term use to relieve stomach discomfort is generally not immediately harmful. However, long-term use can mask underlying stomach issues, leading to delayed diagnosis and treatment. Antacids can also interfere with the absorption of other medications, reducing their effectiveness (e.g., certain antibiotics/antifungals and iron supplements). In such cases, it is recommended to take other medications at least two hours before or after taking an antacid. Furthermore, side effects depend on the specific ingredients: for instance, magnesium oxide can cause diarrhea, while aluminum hydroxide can cause constipation. Long-term use will inevitably lead to these side effects.
- Common ingredients: Aluminum hydroxide, calcium carbonate, sodium bicarbonate, magnesium oxide.
2. Reducing Stomach Acid Secretion
Common categories include Proton Pump Inhibitors (PPIs) and H2 blockers. Their main function is to “reduce the secretion of stomach acid.” Note that these do not neutralize existing acid but rather reduce its irritation to the gastric mucosa, allowing damaged areas to heal. These medications are not meant for “occasional” use; they are typically recommended to be taken consistently for 2–3 months (or a full course of treatment) for optimal results.
- Common ingredients:
- PPIs: Omeprazole, Lansoprazole, Pantoprazole.
- H2 Blockers: Cimetidine, Famotidine.
3. Mucosal Protection
These medications form a protective film to shield ulcerated areas. They are generally considered safe for use during pregnancy.
- Common ingredient: Sucralfate.
4. Gastric Pain Relief
These act as local anesthetics to relieve pain. They can be taken before or after meals, as the timing does not affect their efficacy.
- Common ingredient: Oxethazaine.
After speaking with the gentleman, I advised him to visit a gastroenterologist to have his digestive health properly evaluated. If he does not have an underlying gastrointestinal condition, it is not recommended to pair his medications with antacids. Long-term use can easily lead to side effects, doing more harm than good. I strongly advise the public to consult with medical professionals before using antacids to avoid potential harm from improper use.