Amuco is acetylcysteine, an effervescent tablet in 200 mg and 600 mg strengths. It thins thick mucus, making a chesty cough more productive. The same medicine, at very different doses in hospital, is the antidote for paracetamol overdose.
What is Amuco?
The South African Medicine Price Registry lists three presentations, all Schedule 1 — available from a pharmacy without a prescription:
| Product | Form | Strength |
|---|---|---|
| Amuco OTC | Effervescent tablet | N-acetylcysteine 200 mg |
| Amuco | Effervescent tablet | Acetylcysteine 200 mg |
| Amuco 600 | Effervescent tablet | Acetylcysteine 600 mg |
Acetylcysteine and N-acetylcysteine are the same substance, often shortened to NAC.
It is a mucolytic, and its mechanism is unusually direct. Mucus is thick because long protein chains within it are cross-linked by disulphide bonds. Acetylcysteine carries a free sulphydryl group that breaks those bonds, so the mucus becomes thinner and easier to cough up.
That is a physical effect on the mucus itself, not a suppression of the cough. It does not stop you coughing — it makes coughing more effective, which is the right goal with a chesty cough.
Acetylcysteine is also a precursor of glutathione, the body’s main antioxidant. That is why the same molecule, given intravenously at much higher doses, is the antidote for paracetamol overdose: paracetamol toxicity depletes glutathione, and acetylcysteine replenishes it before liver damage occurs.
Those are different medicines in practice. An effervescent tablet is not a treatment for paracetamol overdose — that requires a hospital and an intravenous infusion, and the antidote works best given early. Anyone who has taken too much paracetamol should go to an emergency department immediately, whatever else is in the cupboard.
What is Amuco commonly used for?
- Chesty, productive cough with thick mucus — from bronchitis, a chest infection or a cold.
- Chronic bronchitis and COPD, where regular use may reduce the frequency of flare-ups.
- Bronchiectasis, where clearing thick secretions is central to management.
- Cystic fibrosis, alongside other treatment.
- Sinusitis with thick secretions, in some prescribing.
It is not a cough suppressant, and that distinction matters. A dry, irritating cough with nothing to bring up may respond to a suppressant; a chesty cough with mucus should not be suppressed, because clearing the mucus is what resolves it. Amuco is for the second kind.
Fluid intake does much of the same job. Thin mucus needs water, and drinking well is genuinely one of the more effective things for a chesty cough. Steam inhalation helps some people.
It does not treat infection. Colds, flu and most bronchitis are viral, and nothing here shortens the illness.
And a cough lasting more than three weeks needs assessment — in South Africa, with weight loss, night sweats or blood in the sputum, that should prompt a TB check.
How Amuco fits into this medicine category
| Group | Examples | What it does |
|---|---|---|
| Mucolytics | Acetylcysteine (Amuco), bromhexine, carbocisteine | Thin mucus so it clears more easily |
| Expectorants | Guaifenesin, ammonium chloride | Intended to loosen mucus; modest evidence |
| Cough suppressants | Dextromethorphan, codeine | Dry coughs only — not chesty ones |
| Bronchodilators | Salbutamol, theophylline | Open the airways in wheeze |
| Antihistamines | Cetirizine (Austell Cetirizine), chlorphenamine (Rhineton) | Allergy; dry secretions |
| Antibiotics | Amoxicillin, azithromycin | Bacterial infection only |
Note the tension: antihistamines thicken secretions, which works against a mucolytic. Combining a cold remedy containing an antihistamine with a mucolytic is common and works at cross purposes. See the allergy, cold and flu medicines hub.
What to check before using Amuco
Speak to a pharmacist or doctor if you:
- Have asthma. Acetylcysteine can occasionally cause bronchospasm, so people with asthma should use it with care and stop if wheeze worsens.
- Have a stomach ulcer or a history of gastrointestinal bleeding — it can irritate the stomach.
- Have kidney or liver disease.
- Have phenylketonuria or need to check excipients — effervescent tablets often contain aspartame and a significant sodium load, which matters with high blood pressure, heart failure or a salt-restricted diet.
- Take antibiotics. Acetylcysteine may reduce the absorption of some — separate them by about two hours.
- Take nitroglycerin, where the combination can lower blood pressure and cause headache.
- Are pregnant or breastfeeding.
- Are treating a child, where the dose depends on age.
Practical points:
- Dissolve the tablet fully in a glass of water and drink it, ideally after a meal.
- Drink plenty of fluid — this genuinely helps, and the medicine works better with it.
- Expect a sulphur smell. Acetylcysteine smells of rotten eggs, which is normal and puts people off unnecessarily.
- Take the last dose before evening rather than at bedtime, so you are not woken by loosened secretions.
- Do not use it for more than a couple of weeks for an acute cough without advice.
Possible cautions and when to ask a pharmacist or doctor
Common effects are nausea, vomiting, diarrhoea, heartburn and a sulphurous taste or smell. Most are mild and reduced by taking it after food.
Get emergency help for:
- Wheezing, chest tightness or difficulty breathing — possible bronchospasm, particularly in asthma. Stop the medicine.
- Swelling of the face, lips or tongue, or a widespread rash.
- Vomiting blood, or black tarry stools.
- Coughing up significant blood.
- Severe breathlessness, or breathlessness at rest.
Contact a doctor if:
- The cough lasts more than three weeks, or comes with weight loss, night sweats, fever or blood in the sputum — get a TB check.
- Sputum becomes green, foul-smelling or blood-streaked, or you develop fever and chest pain.
- You are increasingly breathless, or wheezing.
- Symptoms improve then worsen again — a common pattern when a bacterial infection follows a viral one.
- A child is breathing quickly, drawing in below the ribs, or is unwell.
- You have COPD or bronchiectasis and your usual pattern of sputum changes.
Related medicine guides
- Browse Allergy, Cold & Flu Medicines guides
- Read: Austell Cetirizine used for
- Read: Rhineton used for
Frequently asked questions
What is Amuco 600 used for? Thinning thick mucus in a chesty, productive cough — from bronchitis, chest infections, COPD or bronchiectasis. 600 mg is the higher strength, usually taken once daily.
What is Amuco 200 used for? The same purpose at a lower strength, usually taken two or three times daily.
Is it a cough suppressant? No, the opposite. It thins mucus so coughing clears it more effectively. Suppressants are for dry coughs.
Do I need a prescription? No. It is Schedule 1 and available from a pharmacy.
Why does it smell of rotten eggs? Acetylcysteine contains sulphur. The smell is normal and harmless.
Is it the same as the paracetamol overdose antidote? The same molecule, but a completely different treatment — that is given intravenously at much higher doses in hospital. Suspected paracetamol overdose needs an emergency department, not a tablet.
Can I take it with a cold and flu remedy? Check the ingredients. Many contain antihistamines, which thicken secretions and work against a mucolytic.
Can I take it with asthma? With care, and stop if wheeze worsens — acetylcysteine can occasionally cause bronchospasm. Ask a pharmacist.