PharmSee

location planning

Heartburn and Reflux at the Pharmacy: Antacids, H2 Blockers and PPIs Explained

The step-up approach used by UK pharmacists, what omeprazole 20 mg over-the-counter actually does, and the red flags that need a GP.

By PharmSee · · 1 views

A burning pain behind the breastbone after meals, a sour taste, and a feeling that food is coming back up — these are the classic symptoms of gastro-oesophageal reflux. It is one of the commonest reasons adults walk into a UK pharmacy, and the shelf has more choices than ever. Knowing how pharmacists actually step up treatment helps you buy the right thing first time and understand when it is time to see a GP.

The three tiers of treatment

UK guidance, including NICE Clinical Knowledge Summaries and pharmacist training, uses a step-up approach based on how often symptoms happen and how severe they are.

Step 1: antacids and alginates

For occasional heartburn after a heavy meal, an antacid is usually enough. These work within minutes by neutralising stomach acid. Alginates add a foam layer on top of the stomach contents that reduces reflux into the oesophagus.

Common options include Gaviscon, Rennie, Peptac and supermarket own-brand equivalents. Active ingredients are combinations of sodium alginate, calcium carbonate, sodium bicarbonate and magnesium salts. They are safe in pregnancy in recommended doses; several specifically licensed forms exist.

Limitations: short-acting (two to three hours), can cause constipation or diarrhoea depending on the salt mix, and not suitable long-term for people with heart failure or kidney disease because of sodium content.

Step 2: H2 receptor antagonists

When antacids are needed more than twice a week, the next step is a longer-acting acid suppressor. The main over-the-counter option in the UK in 2026 is famotidine (Pepcid), available in 10 mg and 20 mg tablets. Ranitidine was withdrawn from the UK market in 2020 after impurity concerns and has not returned.

Famotidine works within an hour and lasts up to twelve hours. It is useful for night-time symptoms when taken before bed.

Step 3: proton pump inhibitors (PPIs)

Since reclassification, two PPIs are available without prescription in UK pharmacies:

  • Omeprazole 20 mg (Pyrocalm, Losec, generic) — up to a 14-day course, maximum one tablet a day.
  • Esomeprazole 20 mg (Nexium Control) — the same 14-day self-care limit.

PPIs reduce acid production and are the most effective OTC option for frequent reflux. They take 1 to 4 days to reach full effect, so are taken as a short course, not as rescue medication.

The pharmacist will not normally supply a second 14-day pack in a row without a GP review. Long-term PPI use is possible but is a prescribing decision.

When to stop self-treating and see a GP

The Medicines and Healthcare products Regulatory Agency and NICE both specify red flags that need urgent assessment, not a bigger box of tablets.

See a GP urgently or go to A&E if you have:

  • Unintentional weight loss.
  • Difficulty or pain swallowing.
  • Vomiting blood, or black tarry stools.
  • A lump or mass in the abdomen.
  • Persistent symptoms for more than three weeks despite OTC treatment.
  • Symptoms that start for the first time after age 55.
  • Severe chest pain, especially with sweating or breathlessness — this may not be reflux at all and needs urgent cardiac assessment.

Who should not self-medicate

  • Pregnant women should take only antacids and alginates that are specifically licensed in pregnancy. PPIs need GP input.
  • People already taking clopidogrel, warfarin, methotrexate, digoxin or antifungals should check with the pharmacist because PPIs interact with several common medicines.
  • Children under 16 should be seen by a GP.

Lifestyle changes the pharmacist will mention

Medicines work better alongside simple changes: eating earlier in the evening, raising the head of the bed by 10 to 20 cm, losing weight if overweight, and cutting down on alcohol, smoking and large late meals. Coffee, chocolate and fatty foods trigger reflux in some people but not everyone — keeping a diary for two weeks helps identify personal triggers.

Finding a pharmacy

Every community pharmacy can discuss heartburn treatment confidentially. Use PharmSee's pharmacy directory to find one with late-opening or weekend hours.

Sources

  • NHS: Heartburn and acid reflux
  • NICE Clinical Knowledge Summaries: Dyspepsia — unidentified cause
  • British National Formulary: antacids, H2-receptor antagonists, PPIs
  • MHRA reclassification guidance for omeprazole and esomeprazole