Sometimes, after eating a spicy meal, you get a burning sensation in your chest, right? Or do you feel uncomfortable as if your stomach acid has increased and is coming up into your throat? H2 blockers are a type of medication that many people use at times like this. So today, let's talk about what these H2 blockers are, how they work in our bodies, and what important things we need to know when using them.
What are these H2 Blockers?
Simply put, H2 blockers (also called H2 antagonists) are a type of medication that controls or reduces the production of acid in your stomach.
Stomach acid is essential for digesting the food we eat. But if there is too much of this acid, it can damage the lining of your gastrointestinal tract. This can lead to symptoms like stomach pain and heartburn. It can be as uncomfortable as regretting the last meal you ate.
If you are also experiencing discomfort due to increased stomach acid, you may want to consider using an H2 blocker.
What conditions are H2 blockers used for?
H2 blockers are mainly used to treat conditions related to excess stomach acid production. However, it is important to remember that these medications can gradually lose their effectiveness when used continuously for a long time.
If you have a chronic condition, your doctor may recommend a type of medication called a Proton Pump Inhibitor (PPI) instead of H2 blockers. Although PPIs take longer to work, they can control acid production more effectively than H2 blockers. They can also be used long-term.
Some of the main conditions treated with H2 blockers are listed below.
| Medical condition | A simple explanation |
|---|---|
| Stomach ulcers | The excess acid produced can damage the lining of the stomach and cause ulcers. Reducing acid with H2 blockers gives those ulcers the time and environment they need to heal. |
| Duodenal ulcers | Stomach acid can travel up into the first part of the small intestine (duodenum) and cause ulcers there. This condition can also be treated with H2 blockers, although PPIs are more effective. |
| Acid reflux | Stomach acid travels back up into the esophagus and throat, causing heartburn. This can also cause esophagitis. An H2 blocker is a good solution for this occasional condition. But if this happens frequently (GERD), a PPI is more appropriate. |
| Zollinger-Ellison syndrome | This is a very rare condition. Some tumors that form in this condition cause the stomach to produce too much acid. Although H2 blockers can help control this condition, doctors often recommend PPIs. |
H2 blockers help relieve the following symptoms associated with these conditions:
- Indigestion
- Stomach pain
- Chest pain and sore throat
- Nausea and vomiting
- Sour stomach
How does this medicine actually work inside the body?
It's very simple. Another name for H2 blockers is histamine-2 (H2) antagonists. We learned in school that an 'antagonist' in a story is something that interferes with something? Well, what these H2 antagonists do is interfere with the process of producing acid in the stomach.
Think of it this way. After we eat, our bodies release a chemical called H2. This H2 goes and attaches to the H2 receptors on the walls of the stomach. It's like a key fitting into a lock. This attachment is what tells the stomach, "Okay, now make acid."
When you take an H2 blocker, the drug goes and binds to those H2 receptors (the locks) and "blocks" them. That way, the H2 (the keys) don't get a chance to come and bind to the receptors. When the signal to make acid stops, the stomach produces less acid.
This won't interfere with your digestive process. It will just control the amount of extra acid produced that causes pain and discomfort.
What H2 blocker medications are available?
There are several types of H2 blockers. Some can be purchased over-the-counter (OTC), while others require a prescription from a doctor.
| Name of the drug | A commonly seen brand | How to get it |
|---|---|---|
| Cimetidine | Tagamet® | Over-the-counter and prescription (OTC & Rx) |
| Famotidine | Pepcid® | Over-the-counter and prescription (OTC & Rx) |
| Nizatidine | Axid® | Only on doctor's prescription (Rx only) |
Special Note: You may remember the H2 blocker Ranitidine (Zantac®) that was once very popular. But in April 2020, agencies like the FDA (US Food and Drug Administration) told manufacturers to remove this drug from the market. The reason was that tests showed that over time and when stored at high temperatures, levels of a chemical called nitrosodimethylamine, or NDMA, which is a possible carcinogen, increased to unsafe levels.
How and when should this medicine be used?
H2 blockers can be taken by mouth as pills or capsules. There are also powders that can be dissolved in a liquid for people who have difficulty swallowing pills. They can also be given intravenously (IV) to patients who are hospitalized and cannot take oral medications.
The best time to take the medicine
- For occasional heartburn: If you know that eating spicy or fatty foods can cause heartburn, take an H2 blocker 30 to 60 minutes before eating that food. This gives it time to work. It's okay to take it after the heartburn occurs, but it can take up to an hour for symptoms to subside.
- For a condition such as wound healing: Your doctor may recommend taking it once a day before bed, or once in the morning and once at night, depending on your doctor's instructions.
The most important thing is that if you need to use these medications for more than two weeks at a time, you should definitely see your doctor. It is not advisable to continue using these without finding out the exact cause of your symptoms.
What is the difference between H2 Blockers, Antacids and PPIs?
Many people get confused about these three types of medications used for heartburn. Let's take a quick look at the main differences between them.
| Drug type | Time taken to operate | Duration of effect | The most suitable opportunity |
|---|---|---|---|
| Antacids (e.g. Digene, Gelusil) | Very quick (a few minutes) | Very short (1-2 hours) | When immediate relief is needed. |
| H2 Blockers | About an hour | About 4-10 hours | To prevent occasional heartburn or before meals. |
| PPIs (Proton Pump Inhibitors) | 1-4 days for full effect | Long-term (24 hours+) | For conditions such as chronic gastritis and GERD. |
Are there any side effects?
H2 blockers are generally very safe medications with few side effects . Even if side effects do occur, they are usually minor.
- Stomach pain
- Muscle pain
- Constipation
- Diarrhea
- Dry mouth
- Fatigue
- Headache
Very rarely, people in high-risk groups (especially those over 50 years of age, those with kidney or liver problems) may experience symptoms related to the nervous system, such as memory loss or difficulty speaking. However, this is very rare . These symptoms usually go away within a few days after stopping the medication.
Interactions with other drugs
Some H2 blockers can affect the way other medications you are taking work. For example, the H2 blocker cimetidine can reduce the effectiveness of some antidepressants (SSRIs) and the blood thinner warfarin (`(warfarin)`).
Therefore, before you start a new H2 blocker, it is very important to inform your doctor about all other medications you are already taking.
Are these suitable for pregnant and breastfeeding mothers?
More research is still needed on the safety of using H2 blockers during pregnancy, but it is known that these drugs pass to the baby through breast milk.
Therefore, if you are pregnant, planning to become pregnant, or are a nursing mother, be sure to talk to your doctor before taking any of these medications.
Take-Home Message
- H2 blockers are a type of medication that reduces stomach acid. They are great for providing short-term relief from occasional heartburn and chest pain.
- Although these work faster than PPIs, they are not suitable for long-term, daily use.
- If you need to use H2 blockers for more than two weeks at a time, it could mean you have another underlying problem. Definitely see a doctor.
- Tell your doctor about any other medications you are taking (even vitamins).
- If you are pregnant or breastfeeding, do not use these medications without medical advice.
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