Omiflux 20 is omeprazole 20 mg, a proton pump inhibitor that reduces stomach acid production. It is used for reflux, heartburn, stomach and duodenal ulcers, and to protect the stomach during long-term anti-inflammatory use. Taking it before breakfast makes a large difference to whether it works.
What is Omiflux?
The South African Medicine Price Registry lists Omiflux 20 as a Schedule 2 capsule containing omeprazole 20 mg — available from a pharmacy without a prescription, with the pharmacist involved in the sale.
Omeprazole is a proton pump inhibitor (PPI). Cells in the stomach lining produce acid using an enzyme pump, and omeprazole shuts those pumps down irreversibly. Acid production only recovers as the cell builds new pumps.
Two consequences follow, and both are commonly misunderstood:
It is slow to start. One to four days to full effect. It does nothing useful for heartburn happening right now — that is what an antacid or an alginate is for.
It keeps working well beyond the drug’s own lifespan in the blood, because the pumps are permanently disabled. That is why once daily is enough.
Timing is the practical key. Proton pumps are activated by eating, and omeprazole only blocks pumps that are active. Take it about 30 minutes before your first meal of the day. Taken at bedtime or after food, a substantial part of the dose is wasted — and this is far and away the most common reason people report that omeprazole did not work for them.
Capsules should be swallowed whole. If swallowing is difficult, the contents can usually be sprinkled onto a spoonful of soft food and taken without chewing — ask your pharmacist first.
What is Omiflux commonly used for?
- Gastro-oesophageal reflux disease (GORD) — persistent heartburn and acid regurgitation.
- Oesophagitis — inflammation of the food pipe caused by acid.
- Stomach and duodenal ulcers, both treating them and preventing recurrence.
- Preventing ulcers in people taking long-term anti-inflammatories — an important protective use.
- Helicobacter pylori eradication, combined with two antibiotics.
- Persistent indigestion not controlled by antacids.
- Barrett’s oesophagus and Zollinger-Ellison syndrome, under specialist care.
It treats the acid, not the reason for it. For many people that is enough. But reflux driven by weight, smoking, alcohol, late or large meals, or a hiatus hernia responds to those things too — and the practical measures are unglamorous and genuinely effective: smaller meals, not lying down within three hours of eating, raising the head of the bed, losing excess weight.
PPIs are among the most over-continued medicines in use. They are frequently started for a defined short-term reason and simply never stopped. If you have been taking one for more than a few months without a review, that is worth raising — not because they are dangerous, but because continuing should be an active decision.
How Omiflux fits into this medicine category
| Group | Examples | Speed and strength |
|---|---|---|
| Proton pump inhibitors | Omeprazole (Omiflux), esomeprazole, pantoprazole | Days to full effect; strongest, longest |
| H2 blockers | Famotidine, cimetidine | About an hour; several hours |
| Antacids | Eno, aluminium and magnesium salts | Minutes; short-lived |
| Alginates | Gaviscon-type products | Minutes; form a raft that blocks reflux |
| Antispasmodics | Hyoscine (Hyospasmol) | Cramping, not acid |
| Prokinetics | Metoclopramide (Adco-Contromet) | Nausea and stomach emptying |
A sensible pairing is a PPI daily for control plus an antacid or alginate kept for breakthrough symptoms — the slow medicine and the fast one doing different jobs. See the digestive and stomach medicines hub.
What to check before using Omiflux
Tell your doctor or pharmacist if you:
- Take clopidogrel, used after heart attacks and stents. Omeprazole can reduce its effect; pantoprazole is often preferred instead.
- Take warfarin, methotrexate, digoxin, phenytoin, citalopram, ketoconazole or itraconazole, or HIV medicines.
- Take iron or vitamin B12 supplements — reduced stomach acid lowers absorption of both.
- Have liver disease.
- Have osteoporosis or risk factors for it.
- Are due for an **endoscopy or a test for H. pylori. PPIs can mask the symptoms of stomach cancer and cause false-negative H. pylori results**, so tell whoever arranges the test — you may need to stop it beforehand.
- Are pregnant or breastfeeding.
Practical points:
- Take it 30 minutes before your first meal.
- Swallow capsules whole unless a pharmacist has advised otherwise.
- Give it several days before judging whether it works.
- Do not stop abruptly after long-term use. Acid production can rebound above baseline for a week or two, producing heartburn that feels exactly like the original problem returning — and often prompts people to restart unnecessarily. Tapering avoids most of this.
- Review it periodically rather than repeating indefinitely.
Possible cautions and when to ask a pharmacist or doctor
Common effects are headache, nausea, diarrhoea, constipation, wind and abdominal pain — usually mild.
Long-term use is associated with low magnesium, vitamin B12 deficiency, an increased risk of certain gut infections, and a small increase in fracture risk. These justify periodic review rather than stopping a medicine you need.
Get emergency help for:
- Vomiting blood, or material like coffee grounds.
- Black, tarry stools.
- Severe abdominal pain.
- Chest pain with breathlessness, sweating, or pain spreading to the arm or jaw. Heart attack pain is frequently mistaken for heartburn, and acid remedies are frequently taken instead of calling for help.
- Swelling of the face, lips or tongue, difficulty breathing, or a blistering rash.
Seek prompt advice for muscle cramps, tremor, palpitations or unusual weakness (possible low magnesium), severe or persistent diarrhoea, or joint pain with a rash in sun-exposed areas.
Contact your doctor if:
- Symptoms do not improve after two weeks, or return whenever you stop.
- You have difficulty or pain swallowing, or food sticking.
- You have unintentional weight loss, persistent vomiting, or loss of appetite.
- You are over 45 with new indigestion.
- You have been taking it more than a few months without review.
Those middle points matter: difficulty swallowing, weight loss and persistent vomiting are what separate ordinary reflux from something needing investigation — and a PPI that works just well enough is exactly how they get overlooked.
Related medicine guides
Frequently asked questions
What is Omiflux 20 used for? Reflux and heartburn, oesophagitis, stomach and duodenal ulcers, protecting the stomach during long-term anti-inflammatory use, and as part of H. pylori treatment. It contains omeprazole 20 mg.
When should I take it? About 30 minutes before your first meal of the day. Taken after food or at night, much of the dose is wasted.
How quickly does it work? One to four days for full effect. Use an antacid or alginate for immediate relief.
Do I need a prescription? No. Omiflux 20 is Schedule 2 and available from a pharmacy without one.
Can I take an antacid as well? Yes — that is a sensible combination while the omeprazole builds its effect.
Can I stop taking it? After long-term use, taper rather than stopping abruptly — acid can rebound and mimic the original problem.
Is it safe long term? It is widely used long term where needed. Long-term use is linked to low magnesium, B12 deficiency and a small fracture risk, which is why periodic review matters.
Can I open the capsule? The contents can usually be taken on soft food without chewing — check with your pharmacist first.