Quick verdict
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. Rolaid
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.
Check price on Amazon →Occasional sufferers or frequent heartburn? We compare antacids, H2 blockers, and PPIs to help you choose the right cure for heartburn and indigestion.
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 |
|---|---|---|---|---|
|
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|
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 |
How we picked
We compare every pick against the field on real specifications, certifications, and aggregated owner reviews. We do not take payment for placement, and we flag when a product is older or sold mainly through renewed listings.
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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.
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.
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.
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.
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.
Before you buy
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.
The wrap-up
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. Rolaid
Quick answers
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.
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.
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.
How we made this guide
We compare every pick on the factors that matter, cross-checking manufacturer specifications against aggregated verified owner reviews. We rank independently and never take payment for placement. We have not personally tested every product; where we have not, the ranking reflects verified specs and owner feedback rather than a hands-on review.
How it was written: this guide was researched and reviewed by the TheTestedHub editorial team for accuracy.
Affiliate disclosure: TheTestedHub is reader-supported. When you buy through links on our site, we may earn a commission at no extra cost to you.
