Amyn SF 250 is amoxicillin, supplied as a powder that a pharmacist mixes with water to make a suspension — 250 mg per 5 ml. It is a penicillin antibiotic, used mainly in children for chest, ear, throat, sinus, urinary, dental and skin infections.
What is Amyn Sf 250 Powder For?
The South African Medicine Price Registry lists the Amyn range as Schedule 4 (prescription-only):
| Product | Form | Strength |
|---|---|---|
| Amyn S | Suspension | Amoxicillin 125 mg / 5 ml |
| Amyn SF | Suspension | Amoxicillin 250 mg / 5 ml |
| Amyn | Capsule | Amoxicillin 250 mg |
“Powder for” in the name is short for powder for oral suspension. Antibiotic suspensions are supplied as dry powder because amoxicillin is unstable in water — once mixed, it lasts only days. The pharmacist adds water at the point of dispensing, which is why the bottle you collect is already made up and why it comes with an expiry that is far sooner than the printed one on the box.
Amyn S and Amyn SF are not interchangeable. One is 125 mg per 5 ml, the other 250 mg — double the strength in the same volume. Giving a spoonful of the wrong one either halves or doubles the dose. Check which you have before every dose, particularly if a child has had a different bottle before.
Amoxicillin is a broad-spectrum penicillin. It prevents bacteria from building their cell walls, so they cannot hold their shape and break apart. Because it kills bacteria rather than merely slowing them, is absorbed well by mouth, and tastes acceptable in suspension, it is one of the most prescribed antibiotics for children in the world.
What is Amyn Sf 250 Powder For commonly used for?
- Middle ear infection (otitis media) — one of the commonest reasons it is prescribed for children.
- Chest infections, including community-acquired pneumonia.
- Sinusitis that is not settling.
- Throat and tonsil infection caused by streptococcus.
- Urinary tract infections, depending on local resistance.
- Dental infections and abscesses, alongside dental treatment.
- Skin and soft tissue infections.
- Preventing infection in certain situations, on medical direction.
It will not help colds, flu, or most coughs and sore throats, which are viral. That matters here more than usual, because ear infections and sore throats in children are frequently viral, and antibiotics given for them provide side effects without benefit while contributing to resistance.
If a doctor has advised waiting rather than starting antibiotics for a child’s ear infection, that is a recognised and evidence-based approach — many resolve on their own — and it is not a refusal to treat.
How Amyn Sf 250 Powder For fits into this medicine category
| Group | Examples | Typical role |
|---|---|---|
| Aminopenicillins | Amoxicillin (Amyn SF) | Broad first-line cover: ear, chest, throat, urine, dental |
| Penicillin + inhibitor | Co-amoxiclav | Where bacteria produce enzymes that destroy plain amoxicillin |
| Narrow penicillins | Phenoxymethylpenicillin | Streptococcal throat infection specifically |
| Penicillinase-resistant | Cloxacillin, flucloxacillin | Staphylococcal skin infections |
| Macrolides | Azithromycin (Azrotrin), erythromycin | Alternative in penicillin allergy |
| Nitroimidazoles | Metronidazole | Anaerobic and dental infections |
Where amoxicillin fails, the usual next step is co-amoxiclav, which pairs the same amoxicillin with clavulanic acid to defeat bacterial resistance enzymes. See the antibiotics and antimicrobials hub.
What to check before using Amyn Sf 250 Powder For
Penicillin allergy is the critical check. If the child — or you — has ever reacted to penicillin, amoxicillin, co-amoxiclav or a cephalosporin, say so before the first dose. A previous mild reaction does not guarantee the next will be mild.
Also tell your doctor or pharmacist about:
- Kidney disease — the dose may need adjusting.
- Glandular fever (infectious mononucleosis). Amoxicillin very commonly causes a widespread rash in this situation. It is not usually a true allergy, but it is avoided for that reason, and in teenagers with a sore throat this matters.
- Warfarin, methotrexate or allopurinol.
- Pregnancy or breastfeeding — amoxicillin is generally considered acceptable, but confirm.
Practical points, and with a suspension these matter more than usual:
- Shake the bottle well before every dose. The medicine settles, and an unshaken bottle gives an inconsistent dose.
- Use the measuring device supplied — an oral syringe or the marked cup. Never a kitchen teaspoon, which varies widely in volume.
- Check the strength on the label each time, especially if the child has had a different bottle before.
- Keep it refrigerated if the label says so, and note the discard date — usually seven to fourteen days after mixing. Do not keep leftovers for a future illness.
- Space doses evenly, usually three times a day.
- Complete the full course, even once the child seems better.
- Give it with or without food, whichever the child tolerates.
Possible cautions and when to ask a pharmacist or doctor
The most common effects are diarrhoea, nausea and a mild rash. Mild diarrhoea is expected with broad-spectrum antibiotics because they disturb normal gut bacteria along with the target.
Get emergency help for:
- Swelling of the face, lips or tongue, difficulty breathing, widespread hives, or a rash with blistering or peeling — signs of a serious allergic reaction. Stop the medicine.
- Severe, watery or bloody diarrhoea, especially with fever or cramping, during or in the weeks after the course. This may indicate Clostridioides difficile infection and needs medical assessment rather than an anti-diarrhoeal.
- A rash that does not fade when pressed with a glass, in an unwell child.
Contact your doctor if:
- The infection is not improving after two to three days, or the child is getting worse.
- Fever persists, or the child is drinking poorly, unusually drowsy, or breathing quickly.
- Ear pain worsens, or there is discharge from the ear.
- A rash appears — most amoxicillin rashes are harmless, but they should be looked at, and the distinction from a true allergy matters for every future prescription.
- Thrush develops afterwards — oral or nappy-area — which is common after antibiotics and easily treated.
- You have doses left over. Do not keep them; return them to a pharmacy.
Related medicine guides
Frequently asked questions
What is Amyn SF 250 powder used for? Bacterial infections — ear, chest, throat, sinus, urinary, dental and skin. It is amoxicillin, made up into a suspension at 250 mg per 5 ml.
What does “powder for” mean? Powder for oral suspension. Amoxicillin is unstable in water, so it is supplied dry and mixed by the pharmacist when dispensed.
What is the difference between Amyn S and Amyn SF? Amyn S is 125 mg per 5 ml and Amyn SF is 250 mg — double the strength in the same volume. They are not interchangeable.
How long does the mixed bottle last? Usually seven to fourteen days. Check the label, keep it refrigerated if directed, and discard it after that — do not save it for another illness.
Do I need to shake it? Yes, well, before every dose. The medicine settles, and an unshaken bottle gives an uneven dose.
Can I use a kitchen spoon? No. Use the syringe or measuring cup supplied — kitchen spoons vary widely in volume.
Will it help a cold or flu? No. Those are viral, and so are most children’s coughs and many sore throats and ear infections.
Can I stop when my child seems better? Finish the course unless your doctor says otherwise.