Note: These products may help manage symptoms. They are not medical treatments. Consult a healthcare provider for persistent or serious conditions.
Heartburn and indigestion share some symptoms but often have different drivers. Heartburn is the burning sensation from stomach acid refluxing into the esophagus. Indigestion (dyspepsia) encompasses bloating, gas, nausea, and upper abdominal discomfort - which may or may not involve excess acid. The OTC treatment options address these through three distinct mechanisms, and choosing the right one depends on your frequency of symptoms.
The hierarchy is straightforward: antacids for occasional (1-2 times per month), H2 blockers for regular (several times per week, especially at night), and PPIs for frequent or daily heartburn. The five products below cover all three rungs of this ladder.
| Product | Drug Class | Onset | Duration | Best For |
|---|---|---|---|---|
| Mylanta Maximum Strength Liquid | Antacid + simethicone | 5 min | 30-60 min | Heartburn + gas/bloating combo |
| Rolaids Advanced Antacid + Anti-Gas | Antacid + simethicone | 5 min | 30-60 min | Multi-symptom on the go |
| Alka-Seltzer Original Effervescent | Antacid + aspirin | 5-10 min | 30-60 min | Fast-acting occasional heartburn |
| Zantac 360 Maximum Strength Famotidine | H2 blocker | 15-45 min | 8-12 hours | Prevent or control regular heartburn |
| Nexium 24HR Omeprazole 20mg | PPI | 1-4 days | 24 hours | Frequent/daily heartburn management |
Mylanta Maximum Strength Classic Liquid Antacid
Mylanta’s liquid formula combines aluminum hydroxide and magnesium hydroxide (acid-neutralizing antacids) with simethicone (an anti-foaming agent that breaks up gas bubbles). This combination makes it uniquely effective for heartburn accompanied by gas, belching, and bloating - the multi-symptom presentation of post-meal indigestion. The liquid form acts faster than chewable tablets because it reaches the stomach lining immediately.
Take 2-4 teaspoons between meals and at bedtime. The classic flavor options are mild and tolerable. The bottle is less portable than tablets but the liquid format gives faster symptom onset. Maximum Strength contains higher concentrations of active antacids than the regular formula.
Pros: Fastest-acting formula (liquid), treats heartburn + gas simultaneously, well-tolerated flavor, Maximum Strength formula Cons: Less portable than tablets, shorter duration than H2 blockers or PPIs, aluminum hydroxide not recommended for long-term daily use
Rolaids Advanced Antacid + Anti-Gas
Rolaids Advanced tablets combine calcium carbonate and magnesium hydroxide (antacids) with simethicone for gas - the same multi-symptom approach as Mylanta in a more portable chewable tablet format. The calcium carbonate base provides strong acid neutralization and the magnesium component acts as a mild bowel softener, offsetting the constipating effect that calcium carbonate alone can cause.
The tablets are palatable and chew easily, making them practical to carry and take discreetly in any setting. The Advanced formula is specifically designed for the heartburn + gas combination that follows rich meals, alcohol, or acidic foods - the most common pattern of post-meal indigestion.
Pros: Portable tablet format, treats both heartburn and gas, calcium + magnesium combination offsets constipation, widely available Cons: Shorter duration than H2 blockers, not suitable as a daily treatment, calcium-based antacids can cause constipation with excessive use
Alka-Seltzer Original Effervescent Antacid
Alka-Seltzer Original is one of the fastest-acting heartburn and indigestion remedies available - the effervescent tablet dissolves in water, releasing bicarbonate that neutralizes stomach acid within minutes. The formula contains aspirin alongside the antacid component, which can help with the generalized stomach pain and discomfort that often accompanies indigestion.
Important note: because of the aspirin content, Alka-Seltzer Original is not suitable for people with aspirin allergy, those taking blood thinners, or children and teenagers. The Gold formula (aspirin-free) is the appropriate alternative for those groups. Use for occasional fast-acting relief - not for daily or frequent use.
Pros: Very fast-acting effervescent delivery, highly effective for acute heartburn + stomach pain, iconic and widely trusted formula Cons: Contains aspirin - not for aspirin-sensitive users, blood thinner patients, or children; not for daily use; fizzing requires water
Zantac 360 Maximum Strength Famotidine
Zantac 360 contains famotidine - an H2 (histamine-2) receptor antagonist that reduces the amount of acid your stomach produces for 8-12 hours per dose. Unlike antacids that neutralize acid after it is already present, Zantac 360 prevents acid production from occurring in the first place. This makes it ideal for taking 30-60 minutes before a meal you expect to trigger heartburn, or at bedtime to prevent nighttime reflux.
The Maximum Strength formulation (20mg famotidine) is double the dose of standard Zantac and provides more complete acid suppression for those with significant symptoms. It is also effective for relief after symptoms start, though onset takes 15-45 minutes versus the near-instant effect of antacids.
Pros: 8-12 hour duration, prevents acid before it forms, effective for regular heartburn and nighttime reflux, Maximum Strength option Cons: Slower onset than antacids (15-45 min), not for immediate acute relief, famotidine can interact with some medications
Nexium 24HR Omeprazole 20mg Capsules
Nexium 24HR (omeprazole 20mg) is a proton pump inhibitor - the most powerful class of OTC acid suppression available. PPIs irreversibly block the proton pumps in stomach cells that produce acid, reducing stomach acid output by up to 90%. They provide 24-hour coverage per dose and are the appropriate treatment for people experiencing heartburn most days of the week.
Important: PPIs take 1-4 days of consecutive use to reach full effect and should be taken daily for a minimum of 14 days. Do not take as-needed for a single episode - that is what antacids and H2 blockers are for. Also critical: do not stop PPIs abruptly after extended use. Tapering prevents rebound acid hypersecretion (a temporary overproduction of acid when the drug is removed). If you require PPIs for more than 8 weeks, consult a healthcare provider.
Pros: Most powerful OTC acid suppression, full 24-hour coverage, clinically proven for frequent GERD, Nexium’s trusted delayed-release formula Cons: Takes days to reach full effect, not for occasional use, rebound risk on abrupt discontinuation, long-term use requires healthcare monitoring
What to Look For
Match the product to your frequency. Occasional heartburn (1-4 times per month): antacid. Regular heartburn (several times per week): H2 blocker. Daily heartburn: PPI. Using a PPI for occasional heartburn is unnecessary and creates rebound risk; using an antacid for daily reflux just chases symptoms without controlling them.
Antacids + gas: the combination matters. Standard antacids (calcium carbonate alone) do nothing for bloating. If you frequently experience both heartburn and gas after eating, the simethicone-containing formulas (Mylanta, Rolaids Advanced) are significantly more effective for that presentation.
Aspirin check. Alka-Seltzer Original contains aspirin. If you take blood thinners, have an aspirin allergy, or are treating a child, use Alka-Seltzer Gold (aspirin-free) or a different product.
Seek medical evaluation for frequent symptoms. GERD affecting multiple days per week - especially nighttime symptoms or difficulty swallowing - needs evaluation to rule out esophageal damage.
Final Thoughts
For occasional post-meal heartburn with gas, Mylanta Maximum Strength liquid is the fastest and most comprehensive OTC solution. For people who have dinner triggers or regular nighttime reflux, Zantac 360 taken 30 minutes before the meal is the smart proactive choice. For anyone dealing with heartburn most days of the week, Nexium 24HR is the appropriate step - taken daily for a 14-day course, then reassessed. Rolaids Advanced and Alka-Seltzer cover portable convenience and fast-acting spot relief respectively. The right product depends entirely on how often your symptoms occur.
Frequently asked questions
What is the difference between antacids, H2 blockers, and PPIs for heartburn?+
Antacids (Mylanta, Rolaids, Alka-Seltzer) neutralize acid that is already in the stomach - fast-acting but short-lasting (30-90 minutes). H2 blockers (Zantac 360/famotidine) reduce acid production for 8-12 hours - best before meals or at bedtime. PPIs (Nexium/omeprazole) suppress acid production almost completely for 24 hours - most powerful but require 1-4 days to reach full effect and are for frequent, recurring heartburn.
What is PPI rebound acid hypersecretion and why does it matter?+
When you take a proton pump inhibitor (PPI) like omeprazole daily for several weeks and then stop abruptly, the acid-producing cells in your stomach can overreact and produce more acid than before you started - a phenomenon called rebound acid hypersecretion. This can cause temporary worsening of heartburn symptoms. To avoid this, taper PPI use gradually rather than stopping cold turkey, and consult a healthcare provider if you have been on PPIs for more than 8 weeks.
When should I see a doctor about heartburn instead of treating it with OTC products?+
See a doctor if heartburn occurs more than twice a week, wakes you from sleep regularly, is accompanied by difficulty swallowing, causes persistent chest pain, or has not responded to 2 weeks of consistent OTC PPI use. Frequent uncontrolled reflux can cause esophageal damage (Barrett's esophagus) and requires evaluation.