Omeprazole vs Gaviscon: Which Works Best for Heartburn?

One works in minutes, the other for 24 hours. How they differ, when to step up from one to the other, and whether you can take both.

Part of the Complete Acid Reflux Guide.

How each one works

The distinction that matters: Gaviscon treats the episode you are having; omeprazole prevents the ones you would have had. Neither does the other’s job, which is why the question is less “which is better” and more “which problem do you have — occasional or frequent?” For the full mechanism, see What is a proton pump inhibitor?

Speed vs duration: the comparison table

When Gaviscon is the right choice

• Occasional heartburn — a big meal, a late night, a curry: rescue treatment fits an occasional problem.
• Right-now relief — even PPI users should keep an alginate for breakthrough symptoms.
• Pregnancy — alginates are first-line; see our heartburn in pregnancy guide.
• Bedtime protection — the raft is most useful exactly when you lie down.
• The first days of PPI treatment — covering the gap before omeprazole reaches full effect.

Signs you need to step up to a PPI

The threshold is simple and worth memorising: heartburn twice a week or more is the working definition of GORD, and at that frequency prevention beats rescue — both for comfort and because repeated acid exposure can inflame the oesophagus. Other signals: you are buying Gaviscon on every shop, symptoms wake you at night more than occasionally, or relief no longer lasts until the next meal. A once-daily PPI such as omeprazole treats the pattern rather than the episode.

Can you take both together?

Yes — and it is often the smartest combination. They neither duplicate nor interfere with each other’s core action. The standard pattern: omeprazole once daily, 30–60 minutes before breakfast, with Gaviscon after meals or at bedtime for any breakthrough symptoms. Leave a couple of hours between the two doses, as antacids can slightly reduce the absorption of some medicines taken at the same moment. Most people find their Gaviscon use falls away naturally once the PPI reaches full effect — if it does not, that is worth mentioning at review.

Cost comparison

For occasional use, Gaviscon is cheap per episode but adds up with frequency: a large bottle costs roughly the same as a month of generic omeprazole. Once you are using an alginate most days, a PPI usually becomes both the cheaper and the more effective option — generic omeprazole is one of the least expensive prescription medicines in the UK, whether via NHS prescription charge or a private online service. Frequency, not price, should drive the choice; conveniently, both point the same way.

Treatment from Access Doctor

When heartburn crosses from occasional to frequent, Access Doctor’s pharmacist independent prescribers can prescribe preventive treatment following a short online consultation, delivered discreetly to your door.