Best Medicine for Acid Reflux: PPI vs H2

How Many Types of Acid Reflux Medication Are There?

Ever stood in front of a pharmacy shelf full of acid reducers, not sure which is the best medicine for acid reflux? 🤔

Acid reflux medications actually fall into 3 main groups that work in completely different ways — some act fast but wear off quickly, others act slower but control acid for the whole day.

📊 According to Cleveland Clinic, PPIs reduce stomach acid production by as much as 90-95%, while antacids simply neutralize the acid that is already there — a huge difference.

📖 Want the full overview of acid reflux first? Continue reading Acid Reflux: Everything You Need to Know

Antacids — Acid-Neutralizing Medication

How It Works

Antacids are the most basic type of acid reducer. They work by neutralizing acid that is already in the stomach — like using an alkali to cancel out an acid — rather than stopping acid production at the source.

Advantages

• Act very fast, within minutes
• Available over the counter, no prescription needed
• Good for occasional heartburn

Limitations

• Effect lasts only 1-2 hours
• Do not treat the underlying cause, only relieve symptoms
• Taking them too often may cause diarrhea or constipation

Examples of Medications in This Group

Liquid antacids and chewable antacid tablets containing aluminum hydroxide or magnesium hydroxide

H2 Blockers — Moderate Acid Reduction

How It Works

H2 blockers block histamine receptors (H2 receptors) in the stomach lining, making the stomach produce less acid — rather than just neutralizing acid like antacids, they reduce it at the source to some extent.

Advantages

• Take effect in 30-60 minutes
• Effect lasts 4-12 hours
• Good for moderate symptoms or for taking before bed to prevent nighttime acid reflux

Limitations

• Reduce acid less than PPIs
• Long-term use may lead to tolerance, reducing effectiveness

Examples of Medications in This Group

Famotidine (a common brand name in Thailand) is the most widely used medication in this group

💡 Adjusting your diet alongside medication helps a lot. Continue reading Acid Reflux Diet: What to Eat and Avoid

💊 Read more: Gaviscon is an alginate antacid that works differently from ordinary antacids — Gaviscon: Uses, Dosage & Precautions

PPIs — The Most Powerful Acid Reducers

How It Works

PPIs (Proton Pump Inhibitors) shut down the proton pumps in the stomach lining directly — the final step of acid production — so they reduce acid the most of all three groups.

📊 Mayo Clinic notes that PPIs are the medication doctors prescribe most often for acid reflux, because they reduce acid 3-4 times more than H2 blockers 💊

Advantages

• Reduce acid the most (90-95%)
• Effect lasts up to 24 hours
• Good for severe or chronic symptoms
• Help inflamed esophageal lining heal

Limitations

• Slower to take effect, needs 1-2 hours
• Must be taken 30 minutes before a meal for best results
• Should not be used continuously for too long without consulting a doctor

Examples of Medications in This Group

PPIs widely used in Thailand include Omeprazole GPO and Nexium (Esomeprazole), a newer-generation PPI with better absorption.

Comparing the 3 Types of Acid Reflux Medication

How to Take Acid Reflux Medication for Best Results

Even the best medication will not work fully if taken the wrong way. Check this 👇

PPIs — Take 30 Minutes Before a Meal

This is the golden rule for PPIs. Take them on an empty stomach 30 minutes before a meal, because a PPI needs time to shut down the proton pumps before they become active from eating. Taking it after a meal makes it much less effective.

H2 Blockers — Take Before a Meal or Before Bed

Take 30 minutes before a meal, or before bed — ideal for people who get acid reflux symptoms at night.

Antacids — Take When Symptoms Appear

Take it as soon as you feel heartburn, no need to wait. Avoid taking it together with other medications, as it may interfere with their absorption.

Precautions and Side Effects

Using PPIs for Too Long

PPIs are safe for short-term use, but continuous use for several months without medical supervision may increase the risk of reduced calcium and magnesium absorption. The FDA advises against using over-the-counter PPIs for more than 14 days in a row, or more than 3 courses per year.

Tolerance to H2 Blockers

Long-term use of H2 blockers may cause the body to adapt so the medication becomes less effective. If it feels like it is no longer helping, consult a pharmacist or doctor.

Taking Antacids Too Often

Taking them too often may cause diarrhea (if they contain magnesium) or constipation (if they contain aluminum), and may interfere with the absorption of other medications.

Acid Reducers and Other Medications

All groups of acid-reducing medication may interact with certain drugs, such as blood thinners and antibiotics. Always tell your pharmacist about every medication you are taking.

When to See a Doctor

Acid-reducing medication helps a lot, but some situations need medical attention 🏥

• No improvement after 2 weeks of taking acid reducers
• Difficulty swallowing, or pain when swallowing
• Unintentional weight loss
• Vomiting blood or black stools
• Needing to take acid reducers almost every day for more than 2 weeks

📖 Which symptoms are warning signs to watch for? Continue reading Acid Reflux Symptoms: How to Tell