Which is better: H2 blockers or proton pump inhibitors (PPIs)?

If you experience frequent heartburn or indigestion, heartburn medications can help keep your symptoms at bay. Options include antacids histamine2-receptor antagonists (H2 blockers), and proton pump inhibitors (PPIs).

Over-the-counter (OTC) antacids can help manage mild or occasional indigestion or heartburn. Examples include Tums and Rolaids.

But people may need more aggressive treatment if they have a chronic condition such as GERD or a peptic (stomach) ulcer. 

Two popular solutions are H2 blockers and PPIs. They both work to prevent acid buildup in the stomach and are more powerful than antacids.

H2 blockers may work slightly faster, while PPIs can provide stronger, longer lasting relief. 

Here, we compare the two to help you determine which one is right for you and your needs.

How do H2 blockers work?

Stomach acid enters your body through glands in the lining of your stomach. The body needs this acid to digest food, but sometimes it produces too much, or the acid rises into the esophagus due to a structural problem.

H2 blockers lower acid levels by blocking the production of acid. Over 24 hours, they can reduce the production of stomach acid by around 70%. 

This action reduces the amount of acid from rising into the esophagus and causing damage.

Some common H2 blocker medications are:

• famotidine (Pepcid)
• cimetidine (Tagamet)
• nizatidine (Axid AR)

They are available as OTC and prescription drugs, but the prescription form is stronger than the OTC version. 

H2 blockers may be suitable if you have mild to moderate acid reflux that hasn’t responded to antacids or lifestyle strategies.

How do PPIs work?

PPIs also reduce stomach acid levels, but they are more powerful than H2 blockers. They are also available in OTC form or on prescription.

PPIs also block acid production and reduce the amount of acid in the stomach. This helps manage acid levels and the pain and discomfort of heartburn. It also allows any damage in the esophagus to heal, in most cases.

Compared with H2 blockers, PPIs may also be more effective at promoting healing in the stomach and preventing ulcers and bleeding.

Examples of PPIs include:

• omeprazole (Prilosec)
• lansoprazole (Prevacid)
• esomeprazole (Nexium)

PPIs can take 2–3 days to work and up to 4 weeks to see the full benefits. Although they take longer to work than H2 blockers, they may remain more effective in the long term.

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Which is safer?

There has been some controversy about both drugs.

In 2020, the Food and Drug Administration (FDA) removed all products containing the H2 blocker ranitidine (Zantac) from the market. They did this after finding N-Nitrosodimethylamine (NDMA) in these drugs. In some circumstances, NDMA may increase the risk of cancer.

H2 blockers are generally safe to use. But in fewer than 1% of people, H2 blockers may cause:

• headaches
• dizziness
• constipation

PPIs are effective at suppressing acid that could cause damage to the esophagus. Still, this long-term suppression of stomach acid might increase the risk of:

• deficiencies in essential vitamins and minerals such as B12, vitamin C, iron, magnesium, and calcium
• fetal irregularities if people use them during pregnancy
• respiratory, digestive, and urinary tract infections (UTIs)
• gastric polyps and cancer

PPIs can also interact with antiplatelet drugs, such as clopidogrel, which could increase the risk of a heart attack or other cardiac events.

They may also lead to:

• diarrhea
• upset stomach
• headaches

It is essential to follow a doctor’s instructions when using these or any other drugs. They will balance the possible risks, especially of long-term use, with the risks of not using the medication.

How safe are heartburn medications?

Summary

PPIs and H2 blockers can help treat GERD, acid reflux, and peptic ulcers.

H2 blockers are more suitable for milder, more occasional discomfort that needs quick action. PPIs are more effective for those experiencing consistent, ongoing stomach issues. They may take longer to work than H2 blockers.

Research suggests both are safe, but they may have different uses. A doctor can help you decide on the best option.

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