
Actigut Caps
Alembic Pharma - Capsule - 10 S
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Erythromycin 500 mg (as erythromycin base) tablet
Delivery across India. Free above ₹999; ₹49 from ₹499, ₹99 below. Chennai express delivery is chargeable.
This medicine needs a prescription.
You can pay now and add the prescription afterwards. We pack your order only after a pharmacist verifies it.
A doctor decides whether a prescription can be issued. If it is not issued, the prescription items in your order are cancelled and refunded. You choose this at checkout.
Althrocin 500 mg is used for bacterial infections caused by susceptible organisms such as respiratory tract infections (pharyngitis/tonsillitis, bronchitis, pneumonia), skin and soft tissue infections, ear infections, and certain sexually transmitted infections (e.g., chlamydial infections) as prescribed by the doctor; also used in penicillin-allergic patients for some infections.
Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated September 2026
Althrocin 500 mg contains Erythromycin 500 mg (as erythromycin base) tablet. It belongs to the Macrolide antibiotic class of medicines.
Erythromycin is a macrolide antibiotic that inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit. This stops bacterial growth (mainly bacteriostatic) and helps clear the infection.
Take as prescribed by the physician. Usually taken orally with water; best taken on an empty stomach (1 hour before or 2 hours after food) unless stomach upset occurs, in which case take with food. Complete the full course; do not skip doses.
Take it exactly as your doctor prescribed. Do not change the dose or stop early on your own.
Take it as soon as you remember. If your next dose is almost due, skip the one you missed — never take two doses together to catch up.
An overdose of this medicine can cause vomiting, hearing disturbance and heart rhythm changes. Do not wait for symptoms to appear — go to the nearest emergency department and take the pack or strip with you.
Most side effects of Althrocin are mild and settle as the body adjusts. Reported side effects include:
Stop the medicine and seek help immediately for a rash, swelling of the face or lips, wheezing or difficulty breathing. Tell your doctor about any side effect that persists or worries you.
| Pregnancy | Consult doctor (generally considered usable in pregnancy when clearly needed). |
|---|---|
| Breastfeeding | Consult your doctor before using this while breastfeeding. |
| Alcohol | Use with caution (may worsen stomach upset; avoid excess alcohol). |
| Driving | Not expected to affect your ability to drive. |
| Kidney | Use with caution if you have kidney disease — your doctor may adjust the dose or monitor your kidney function. |
| Liver | Consult your doctor if you have liver disease. |
| Habit forming | No |
Use only for bacterial infections. Inform doctor if you have liver disease, history of jaundice with erythromycin, myasthenia gravis, heart rhythm problems/QT prolongation, low potassium/magnesium, or severe diarrhoea. Stop and seek care if allergic reaction, severe skin rash, or persistent/watery/bloody diarrhoea occurs (risk of C. difficile). May cause liver enzyme elevation or cholestatic hepatitis (rare).
Not for anyone with a known allergy to this medicine or to any ingredient in the pack. Not for anyone with a known allergy to macrolide antibiotics, or with certain heart rhythm disorders.
Warfarin/other anticoagulants (↑bleeding risk), theophylline (↑levels), carbamazepine (↑levels), digoxin (↑levels), ciclosporin/tacrolimus (↑levels), statins such as simvastatin/lovastatin (↑myopathy risk), ergot derivatives (avoid), QT-prolonging drugs (e.g., amiodarone, sotalol, certain antipsychotics/fluoroquinolones) (↑arrhythmia risk), rifampicin (↓erythromycin levels), oral contraceptives (possible reduced efficacy if vomiting/diarrhoea occurs)
Store below 25°C in a dry place, protected from light and moisture. Keep out of reach of children.
Take it at the same time each day and complete the course. Taking it with food reduces nausea unless the pack says to take it on an empty stomach.
Medicines with the same active ingredient (Erythromycin 500 mg (as erythromycin base) tablet). Ask your doctor or pharmacist before switching brands.
| Medicine | Pack | Price | vs Althrocin 500 mg |
|---|---|---|---|
| Eltocin 250 mg TabletIPCA LABORATORIES LTD` | tablet · 15`S | ₹94 | 27% cheaper |

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The information on Althrocin 500 mg is compiled from the manufacturer's prescribing information and the sources below, and is reviewed by a registered medical practitioner. It does not replace advice from your own doctor.