Amoxil contains amoxicillin, a penicillin antibiotic. It is used for chest, ear, sinus, throat, urinary, skin and dental infections, and as part of treatment to clear Helicobacter pylori. It comes as capsules and paediatric suspensions, and is one of the most commonly prescribed antibiotics for children.
What is Amoxil?
Amoxil is Schedule 4 — prescription-only — and comes in several forms:
| Product | Contains |
|---|---|
| Amoxil 250 / 500 | Amoxicillin 250 mg / 500 mg capsule |
| Amoxil S | Amoxicillin 125 mg/5 ml suspension |
| Amoxil SF | Amoxicillin 250 mg/5 ml suspension |
The same ingredient is sold under many other names in South Africa. Being dispensed one rather than another is ordinary generic substitution.
A data note: some registry listings show phenylephrine and neomycin against one Amoxil drops entry. Those are database errors — neither belongs in an amoxicillin preparation, and every other Amoxil entry lists amoxicillin alone. Amoxil is an amoxicillin product. Confirm against your own pack.
Amoxicillin is a penicillin (beta-lactam) antibiotic. Bacteria are enclosed by a rigid cell wall that holds them against their own internal pressure. Amoxicillin blocks the enzymes that build and repair that wall, so the wall fails and the bacterium bursts. Human cells have no cell wall, which is why the effect is selective and why penicillins are so well tolerated.
Amoxicillin is a broad-spectrum penicillin, absorbed well by mouth and active against a wider range of bacteria than the original penicillins — which is why it is such a workhorse, particularly in children.
Its main limitation is resistance. Many bacteria produce beta-lactamase, an enzyme that destroys amoxicillin before it can act. That is precisely why co-amoxiclav exists — adding clavulanic acid to block the enzyme. If plain amoxicillin has not worked, that is the usual reason, and it is why a doctor may step up rather than simply repeat.
What is Amoxil commonly used for?
A doctor may prescribe it for:
- Middle ear infections (otitis media) — a very common use in children, where amoxicillin is first-line.
- Chest infections, including community-acquired pneumonia.
- Sinusitis, where symptoms are persistent or worsening.
- Streptococcal throat infections and tonsillitis.
- Urinary tract infections, where the organism is susceptible.
- Dental infections and abscesses, alongside dental treatment.
- Skin and soft-tissue infections.
- ***Helicobacter pylori* eradication**, combined with a proton pump inhibitor and another antibiotic.
- Preventing infection before certain dental or surgical procedures in at-risk people.
It has no effect on viruses. Colds, flu, most sore throats, most coughs and most bronchitis are viral. Most ear infections and sore throats in children also settle without antibiotics, which is why a doctor may advise waiting rather than prescribing — that is a considered decision, not a refusal to treat.
How Amoxil fits into this medicine category
| Group | Examples | Typical role |
|---|---|---|
| Penicillins | Amoxicillin (Amoxil), flucloxacillin, penicillin V | Common first-line choices |
| Penicillin + inhibitor | Co-amoxiclav | Where beta-lactamase resistance is likely |
| Cephalosporins | Cefalexin | Skin, throat, urinary infections |
| Macrolides | Azithromycin | Chest infections, penicillin allergy |
| Tetracyclines | Doxycycline | Chest, skin, STIs, tick bite fever |
| Nitroimidazoles | Metronidazole | Anaerobic and some parasitic infections |
See the antibiotics and antimicrobials hub.
What to check before using Amoxil
Tell your doctor about any penicillin allergy before you start. This is the most important check, and worth being precise about. Many people believe they are penicillin-allergic when they are not — a childhood rash during a viral illness is frequently mislabelled as an allergy, and that label then steers them towards broader, less suitable antibiotics for life. Describe exactly what happened; formal allergy testing can resolve it.
Complete the full course.
Amoxicillin can be taken with or without food. Take doses at evenly spaced intervals.
Tell your doctor or pharmacist if you:
- Have had any reaction to a penicillin or cephalosporin, especially swelling, difficulty breathing or a severe rash.
- Have glandular fever (infectious mononucleosis). Amoxicillin causes a widespread rash in most people with glandular fever — an important and frequently misunderstood interaction. It is not a true allergy, but it is why amoxicillin is avoided when glandular fever is suspected, and why a rash in this setting should be assessed rather than assumed allergic.
- Have kidney disease, which may mean a lower dose.
- Have leukaemia, where rash is also more likely.
- Are pregnant or breastfeeding.
- Take warfarin, methotrexate or allopurinol.
- Use the combined oral contraceptive pill. Antibiotics do not generally reduce its effectiveness, but severe vomiting or diarrhoea can.
Shake suspensions well, use the measuring device supplied rather than a kitchen spoon, and check storage — most reconstituted suspensions must be refrigerated and discarded after a set number of days.
Possible cautions and when to ask a pharmacist or doctor
Common effects are nausea, diarrhoea, stomach upset, and thrush (oral or vaginal). Amoxicillin is generally well tolerated, and causes less diarrhoea than co-amoxiclav.
Stop and seek medical attention urgently if you develop:
- Swelling of the face, lips, tongue or throat, difficulty breathing, or a widespread hives-like rash — a serious allergic reaction. Call emergency services.
- Any rash, which should be assessed rather than ignored — it needs distinguishing from the glandular fever rash.
- Blistering or peeling skin, or sores in the mouth or eyes.
- Severe, watery or bloody diarrhoea, during or in the weeks after the course. This may indicate a C. difficile infection, and anti-diarrhoeal medicines should not be used in that situation.
- Yellowing of the eyes or skin, or dark urine.
- Fever, sore throat or mouth ulcers, or unusual bruising or bleeding.
- Much less urine than usual.
- A seizure, which is rare and more likely with kidney impairment.
Contact your doctor if you are no better after two to three days of treatment, or if symptoms worsen at any point — the organism may not be susceptible, and a different antibiotic may be needed.
Never use antibiotics left over from a previous illness or prescribed for someone else.
Related medicine guides
- Browse Antibiotics, Antifungals & Antimicrobials guides
- Read: Azrotrin used for
- Read: Metronidazole used for
Frequently asked questions
What is Amoxil used for? Bacterial infections of the ears, chest, sinuses, throat, urinary tract, skin and teeth, and as part of H. pylori treatment. It contains amoxicillin.
What is Amoxil 250 used for? The lower capsule strength, used for the same infections. Your doctor chooses the strength based on the infection, your weight and kidney function.
What is Amoxil suspension used for? The paediatric liquid forms, dosed by a child’s weight, commonly for ear and chest infections.
Is Amoxil the same as co-amoxiclav? No. Amoxil is amoxicillin alone. Co-amoxiclav adds clavulanic acid to overcome bacterial resistance.
Will it help flu or a cold? No. Those are viral, and antibiotics have no effect on them.
Why did I get a rash on it? A rash needs assessing. Amoxicillin causes a widespread rash in most people with glandular fever, which is not a true allergy — but swelling or breathing difficulty is an emergency.
Am I really allergic to penicillin? Many people labelled penicillin-allergic are not, often from a childhood rash during a viral illness. Testing can resolve it, and it is worth doing.
Can I stop when I feel better? No. Finish the prescribed course unless your doctor tells you otherwise.