Mist Alba — “white mixture” — is a traditional compounded antacid liquid dispensed by South African pharmacies. It relieves indigestion, heartburn and acid discomfort by neutralising stomach acid. It works within minutes but briefly, and it is for occasional use rather than persistent symptoms.
What is Mist Alba?
Mist Alba takes its name from the Latin Mistura Alba, meaning white mixture. It is a compounded antacid — a liquid made up by a pharmacy rather than manufactured as a branded product, which is why it does not appear in the medicine price registry the way a proprietary medicine does.
Its exact composition varies between compounders, so ask your pharmacist what is in the bottle you have been given. Preparations of this type are built from alkaline salts — typically magnesium carbonate or hydroxide, sometimes with sodium bicarbonate — suspended in water, which is what gives the mixture its characteristic white appearance.
How it works is direct chemistry. Stomach acid is hydrochloric acid; these alkaline salts neutralise it on contact. Less acid means less burning, and less irritation of an already inflamed stomach lining or gullet.
That gives antacids their defining characteristics: they act within minutes, because no absorption or metabolism is needed, and they do not last long, because the stomach simply produces more acid. An antacid relieves an episode; it does not reduce how much acid you make.
This is a genuinely useful medicine for what it does. It is not a treatment for persistent reflux, which needs something that reduces acid production, such as the pantoprazole in Peploc.
What is Mist Alba commonly used for?
- Indigestion (dyspepsia) — discomfort or burning after eating.
- Heartburn — burning behind the breastbone from acid rising into the gullet.
- Acid reflux, for occasional symptom relief.
- Sour or acidic stomach discomfort.
- Mild gastritis symptoms.
- Breakthrough symptoms in someone already on a longer-acting acid medicine.
The important distinction is between occasional and persistent symptoms.
Occasional heartburn — after a large or rich meal, or a late dinner — is exactly what an antacid is for. Fast, effective, and nothing more needed.
Persistent heartburn, occurring most days or for more than a few weeks, is a different situation. Continuing to reach for an antacid controls the sensation while leaving the underlying reflux untreated, and prolonged untreated reflux can damage the gullet. That warrants a proper conversation and probably a different medicine.
And some symptoms need investigation rather than any antacid at all — those are listed below, and they matter more than anything else on this page.
How Mist Alba fits into this medicine category
| Group | Examples | Speed and duration |
|---|---|---|
| Antacids | Mist Alba, Rennies, magnesium and aluminium mixtures | Minutes; short-lived |
| Alginates | Gaviscon | Forms a raft against reflux |
| H2 blockers | Famotidine | Hours; moderate acid reduction |
| Proton pump inhibitors | Pantoprazole (Peploc, Praztek) | Days to full effect; strongest, longest |
| Antispasmodics | Hyoscine butylbromide (Buscopan) | For cramping, not acid |
Many people do well combining a longer-acting medicine for control with an antacid on hand for breakthrough symptoms. See the digestive, stomach and nausea medicines hub.
What to check before using Mist Alba
Ask your pharmacist what is in it, particularly the magnesium and sodium content, since those determine most of the cautions.
Shake the bottle before each dose and use the measure supplied.
Separate it from other medicines by at least two hours. This is the most practically important point. Antacids bind other medicines in the gut and reduce their absorption — including antibiotics such as ciprofloxacin and tetracyclines, thyroid medicine, iron, and some HIV medicines. Taking them together can make the other medicine fail.
Speak to a pharmacist or doctor if:
- You have kidney disease. This matters most — impaired kidneys handle a magnesium load poorly, and magnesium can accumulate to dangerous levels.
- You have heart failure, high blood pressure, or are on a low-salt diet — sodium-containing formulations matter here.
- You have diarrhoea, since magnesium salts loosen stools further.
- You are pregnant or breastfeeding.
- The medicine is for a child.
- You take any regular medicine — ask about spacing.
- You are on a long-acting acid medicine already and are still needing this often.
Follow the label. This page does not set doses.
Possible cautions and when to ask a pharmacist or doctor
Report alarm symptoms rather than treating them. These need investigation, not an antacid:
- Difficulty or pain on swallowing, or food sticking.
- Unintended weight loss.
- Vomiting blood, or material like coffee grounds.
- Black tarry stools.
- Persistent vomiting.
- Anaemia, or unexplained tiredness and breathlessness.
- New indigestion starting over the age of about 50.
- Pain that spreads to the arm, jaw or back, or comes with breathlessness or sweating — that may be cardiac, not digestive, and needs emergency assessment.
Magnesium loosens the bowels; aluminium binds them. Compounded mixtures balance these, but diarrhoea or constipation with regular use is worth mentioning.
Do not use it daily for weeks without review. If you need an antacid most days, ask about a medicine that reduces acid production instead.
Lifestyle measures genuinely reduce reflux: smaller meals, not eating within three hours of lying down, raising the head of the bed, reducing alcohol, losing excess weight, and stopping smoking.
Seek urgent medical attention for chest pain spreading to the arm, jaw or back, or with breathlessness or sweating; vomiting blood or coffee-ground material; black tarry stools; difficulty swallowing; severe abdominal pain; or marked muscle weakness with confusion in someone with kidney disease.
Related medicine guides
- Browse Digestive, Stomach & Nausea Medicines guides
- Read: Hyospasmol used for
- Read: Adco Contromet used for
Frequently asked questions
What is Mist Alba used for? Indigestion, heartburn and acid discomfort. It is a traditional compounded antacid mixture — the name means “white mixture”.
What is in it? Alkaline salts such as magnesium carbonate or hydroxide, sometimes with sodium bicarbonate. The exact composition varies by compounder, so ask your pharmacist.
How quickly does it work? Within minutes, because it neutralises acid directly. The effect is short-lived.
Can I take it every day? Not indefinitely. Needing an antacid most days means the reflux is not controlled, and a medicine that reduces acid production is more appropriate.
Can I take it with my other tablets? Separate them by at least two hours. Antacids bind other medicines and can stop them working — including antibiotics, thyroid medicine and iron.
When should I see a doctor instead? For difficulty swallowing, weight loss, vomiting blood, black stools, persistent vomiting, or new indigestion over about 50. Chest pain with breathlessness or sweating needs emergency care.