Heartburn, the uncomfortable burning sensation in the chest that often extends to the throat, is a common ailment affecting millions.¹ While dietary and lifestyle changes can often help, over-the-counter (OTC) medications offer readily available relief.² These medications fall into distinct categories, each with its own mechanism of action, speed of relief, and duration of effect.³ Understanding these differences is key to choosing the best option for your specific heartburn needs.

Here are five of the best OTC heartburn medications, categorized by their active ingredients and how they work:

1. Antacids (e.g., Tums, Rolaids, Maalox, Mylanta, Gaviscon)

How they work: Antacids are the fastest-acting OTC heartburn medications. They work by directly neutralizing stomach acid.⁴ Their active ingredients typically include calcium carbonate, magnesium hydroxide, aluminum hydroxide, or a combination of these.⁵ Some, like Mylanta and Gaviscon, may also contain simethicone to help with gas.⁶

Why they’re great:

• Fast relief: Antacids provide almost immediate relief, often within minutes, by directly counteracting the acid causing the burning sensation.⁷ This makes them ideal for on-demand, occasional heartburn.
• Variety of forms: Available as chewable tablets, liquids, and dissolvable tablets, antacids offer flexibility in administration.⁸ Liquid forms tend to work even faster than chewables as they don’t require digestion.⁹
• Widely available and affordable: You can find antacids in almost any pharmacy, grocery store, or convenience store, and they are generally inexpensive.¹⁰

Considerations:

• Short-lived relief: The effects of antacids are temporary, usually lasting only an hour or two.¹¹ They don’t prevent acid production, so if your heartburn is frequent, you’ll need to take them repeatedly.
• Potential side effects: Calcium carbonate can cause constipation, while magnesium hydroxide can lead to diarrhea.¹² Combination products often balance these effects. Excessive use of calcium-containing antacids can also lead to hypercalcemia (too much calcium in the blood).¹³
• Drug interactions: Antacids can interfere with the absorption of certain medications, so it’s always wise to consult with a pharmacist or doctor if you’re taking other drugs.¹⁴

Best for: Occasional heartburn, mild indigestion, and fast relief.¹⁵

2. H2 Blockers (e.g., Famotidine – Pepcid AC, Zantac 360; Cimetidine – Tagamet HB)¹⁶

How they work: Histamine-2 (H2) blockers reduce the amount of acid produced by the stomach.¹⁷ They do this by blocking histamine receptors in the stomach lining, which are responsible for stimulating acid secretion.¹⁸

Why they’re great:

• Longer-lasting relief: While they don’t work as quickly as antacids (typically taking 30-90 minutes to kick in), H2 blockers provide relief for a longer duration, often up to 12 hours. This makes them suitable for heartburn that occurs a few times a week.
• Preventative use: H2 blockers can be taken before meals to prevent heartburn, especially if you know certain foods trigger your symptoms.
• Effective for frequent heartburn: For those experiencing heartburn more regularly than occasionally but not daily, H2 blockers can be a good choice.

Considerations:

• Slower onset: Not ideal for immediate, on-the-spot relief.
• Tolerance: Over time, some people may develop a tolerance to H2 blockers, meaning they become less effective.¹⁹
• Potential side effects: Generally well-tolerated, but can include headaches, dizziness, and diarrhea.

Best for: Heartburn that occurs a few times a week, preventing heartburn before meals, and providing longer-lasting relief than antacids.

3. Proton Pump Inhibitors (PPIs) (e.g., Omeprazole – Prilosec OTC; Esomeprazole – Nexium 24HR; Lansoprazole – Prevacid 24HR)²⁰

How they work: PPIs are the most powerful acid reducers available OTC. They work by irreversibly blocking the “proton pumps” in the stomach lining that produce acid. This significantly reduces acid production for an extended period.

Why they’re great:

• Most effective for frequent heartburn: PPIs are the go-to choice for individuals suffering from frequent heartburn (two or more days a week) or symptoms of gastroesophageal reflux disease (GERD).
• Longest-lasting relief: A single dose can provide 24-hour relief.
• Heals esophageal damage: By consistently reducing stomach acid, PPIs allow the esophagus to heal from acid-related damage.²¹
• Preventative and treatment: They are effective for both preventing and treating chronic heartburn.

Considerations:

• Slowest onset: PPIs don’t provide immediate relief.²² It can take 1 to 3 days for them to reach their full effect. They are typically taken as a 14-day course of treatment, not for occasional use.
• Not for immediate relief: You shouldn’t take a PPI for a single episode of heartburn.
• Potential for long-term side effects: While generally safe for short-term use, long-term or high-dose PPI use has been associated with potential risks such as an increased risk of bone fractures, kidney problems, and certain infections.²³ It’s crucial to follow package directions and consult a doctor if you need to use them for longer than 14 days or more than three times a year.
• Drug interactions: PPIs can interact with various medications, including blood thinners and certain antidepressants.²⁴

Best for: Chronic heartburn (2+ days a week), GERD, and healing esophageal irritation.

4. Combination Products (e.g., Pepcid Complete, Zegerid OTC)²⁵

How they work: These medications combine an antacid for fast relief with an H2 blocker or PPI for longer-lasting acid reduction. For example, Pepcid Complete combines famotidine (an H2 blocker) with calcium carbonate and magnesium hydroxide (antacids).²⁶ Zegerid OTC combines omeprazole (a PPI) with sodium bicarbonate (an antacid).²⁷

Why they’re great:

• Dual action: They offer the best of both worlds – quick relief from the antacid component and sustained acid reduction from the H2 blocker or PPI.²⁸
• Convenience: A single pill or chewable can address both immediate symptoms and ongoing acid production.

Considerations:

• May not be necessary for all users: If your heartburn is infrequent, a simpler antacid might suffice. If it’s chronic, a standalone PPI might be more appropriate.
• Cost: Can sometimes be more expensive than single-ingredient products.

Best for: Individuals who need both fast-acting relief and longer-lasting acid control, or those who find a single medication insufficient.

5. Alginates (e.g., Gaviscon Advance – available in some regions, specific formulations)²⁹

How they work: While Gaviscon in the US typically functions as an antacid, some international formulations (like Gaviscon Advance) contain alginic acid (alginate).³⁰ When consumed, alginate forms a protective raft that floats on top of the stomach contents.³¹ This physical barrier helps to prevent acid from refluxing into the esophagus.³²

Why they’re great:

• Unique protective barrier: Offers a different mechanism of action than antacids, H2 blockers, or PPIs, physically blocking reflux.
• Fast relief: Can provide quick relief similar to antacids.
• Often recommended for “reflux” sensation: Particularly helpful for symptoms like a lump in the throat or excessive burping, which might be due to reflux of stomach contents rather than just acid.

Considerations:

• Availability: Not all formulations of Gaviscon contain alginate, and the most potent alginate products might be easier to find in some countries than others.
• Taste and texture: Liquid alginates can have a somewhat chalky or thick consistency, which some people might find unappealing.

Best for: Individuals experiencing reflux symptoms that feel more like a physical backflow of stomach contents, or those who haven’t found complete relief with traditional antacids or acid reducers.

Choosing the Right OTC Heartburn Medication

The best OTC heartburn medication for you depends on the frequency and severity of your symptoms:

• Occasional, mild heartburn: Antacids are your best bet for quick relief.
• Heartburn a few times a week: H2 blockers can provide longer-lasting relief and can be taken preventatively.
• Frequent heartburn (2+ days a week) or GERD symptoms: PPIs are generally the most effective, but they require a course of treatment and aren’t for immediate relief. Consult your doctor if you need to use them long-term.
• Need both fast and lasting relief: Combination products may be a good option.
• Reflux with a physical sensation of backflow: Alginates can offer unique protective benefits.

Always read the product label carefully, follow dosage instructions, and be aware of potential side effects and drug interactions. If your heartburn is severe, persistent, or accompanied by other concerning symptoms (like difficulty swallowing, unexplained weight loss, or chest pain radiating to the arm or jaw), seek medical attention immediately, as these could indicate a more serious underlying condition.