The Best Reflux Relief on a GLP-1

Reflux is the side effect people put up with longest, partly because it arrives gradually and partly because the obvious remedy is available in every shop. Both of those are reasons it goes unmanaged for years.

Why it happens here specifically

Delayed gastric emptying is the mechanism of the drug, and it means dinner is still in your stomach at 11 p.m. Lying flat gives that volume somewhere to go. It is a mechanical problem before it is an acid problem.

That distinction matters for treatment. It is why positional measures work better than people expect, why alginate rafts suit this situation particularly well, and why acid suppression alone sometimes underwhelms — you have reduced the acidity of what refluxes without reducing the reflux.

Do these first. They are free and they work.

1. Nothing to eat in the 3 hours before bed. The single highest-yield change.
2. Smaller, more frequent meals rather than a large dinner.
3. Raise the head of the bed by 10–15 cm with blocks under the legs — not extra pillows, which bend you at the waist and make it worse.
4. Less fat in the evening. Fat is the slowest thing to leave the stomach.
5. Separate drinks from meals by about 30 minutes.
6. Alcohol relaxes the lower oesophageal sphincter, and it goes further than it used to — drinking alcohol on a GLP-1.

If reflux is severe and persistent despite these, that is a reason to discuss the titration schedule with your prescriber rather than to escalate medication indefinitely.

The rubric

1. Speed of onset — minutes, hours or days.
2. Duration of effect, particularly overnight.
3. Mechanism fit, given this is mechanical reflux.
4. Interaction burden, especially with the supplements this population takes.
5. Suitability for long-term use.
6. Availability without prescription.
7. Cost.

The ranking

1. Gaviscon Advance

Best mechanism fit, and the most underused option here.

An alginate. On contact with stomach acid it forms a gel raft that floats on top of the stomach contents and physically blocks reflux, rather than only neutralising acid. For a problem that is fundamentally about volume moving upward, that is the mechanistically correct answer.

It acts within minutes, it is well suited to a dose taken after the evening meal and again at bedtime, and it has essentially no systemic absorption.

Where it falls short. Duration is limited — it covers a window rather than a day. It has a chalky texture some people dislike. Sodium content is relevant if you have hypertension or heart failure, which overlaps with the caution in blood pressure on a GLP-1. And formulations vary between markets — the alginate-forward version is the one that does this job.

2. Pepcid AC (famotidine)

Best balance of speed and duration.

An H2 receptor blocker, reducing acid production. Onset in roughly 30–60 minutes and duration long enough to cover a night, which makes it the sensible bedtime option for someone whose reflux is nocturnal.

Where it falls short. Less potent than a proton pump inhibitor. Tolerance can develop with continuous use. It reduces acidity, which is exactly what iron, B12 and calcium absorption depend on — a consideration given how much of that this population is already trying to absorb, per the multivitamin rankings.

3. TUMS

Fastest relief, shortest duration.

Calcium carbonate, neutralising acid already present, acting within minutes. Cheap, available everywhere, and genuinely useful for breakthrough symptoms.

Where it falls short. Duration measured in an hour or so. Calcium interferes with iron and levothyroxine absorption, so timing matters more here than the packaging suggests — keep it 4 hours from either. And using a calcium antacid many times a day adds up to a substantial calcium load.

4. Prilosec OTC (omeprazole)

Most effective, and a decision rather than a habit.

A proton pump inhibitor. For genuine reflux disease, PPIs are more effective than anything above them, and for erosive oesophagitis they are the treatment.

Where it falls short. It takes 1–4 days to reach full effect, so it is the wrong choice for tonight’s symptoms — a very common misunderstanding. And long-term use has real trade-offs: reduced absorption of magnesium, vitamin B12 and calcium, associations with enteric infections, and in some analyses fracture risk. In a person eating half of what they used to and already at risk of those exact shortfalls, that stacking deserves thought rather than a repeating prescription. Omeprazole also interacts with clopidogrel.

Use it as a defined course, then review. Not for two years by default.

5. Nexium 24HR (esomeprazole)

Equivalent to the above, marginally cleaner interaction profile.

The same class with a slightly different interaction picture — generally preferred over omeprazole alongside clopidogrel. Everything else applies unchanged.

Where it falls short. All the PPI caveats above. More expensive than generic omeprazole for a difference that matters to a minority.

6. Mylanta / Maalox liquid antacid

Best coating relief for irritation.

Liquid aluminium and magnesium antacids act fast and coat, which suits an already irritated oesophagus. The liquid format is easier than tablets when swallowing is uncomfortable.

Where it falls short. Short-lived. The magnesium component loosens stools, which is either a bonus or a problem depending on which end of the gut is troubling you — see the magnesium rankings. Aluminium-containing antacids should be used cautiously in kidney disease. Interferes with absorption of several drugs.

7. Alka-Seltzer and effervescent antacids, as a category

Ranked last, deliberately.

They do relieve heartburn. They are on this list because people reach for them and should think twice.

Where they fall short. Many contain aspirin, which is itself a gastric irritant and the wrong thing for an inflamed stomach — and which matters more if you also take an anticoagulant. The sodium load is substantial for anyone with hypertension or heart failure. And the effervescence adds gas to a gut that is already distended and slow. There is almost always a better option on this page.

Summary

Two things not to ignore

Your teeth. Reflux erodes enamel on the inner surfaces of the upper front teeth, where you cannot see it and a dentist can. Do not brush immediately after an episode — acid softens enamel and brushing scrubs it off. Rinse with water or a bicarbonate solution, wait 30–60 minutes, then brush. The detail is in GLP-1s and your teeth.

The symptoms that are not reflux. Difficulty swallowing, food sticking, vomiting blood, black tarry stools, unintentional weight loss beyond what the drug explains, or new reflux with chest pain — all need assessment rather than an antacid. Chest pain in particular is not a symptom to treat with heartburn tablets on the assumption it is indigestion, and the red-flag list is in the side effects nobody preps you for.