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Prescription requiredAristo Pharmaceuticals Pvt LtdAntibiotic

Megapen 1 g Injection Vial

Ampicillin + Cloxacillin

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Megapen 1 g Injection Vial is used for this medicine is used in the treatment of bacterial infection, throat infection, chest infection, skin infection and urinary infection.

Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated September 2026

Licensed pharmacyPharmacist-verified order

Key details

Salt: Ampicillin + Cloxacillin
Available variants: injection 1 gm VIAL
Best price: ₹27
MRP: ₹29
Prescription: Required
Manufacturer: ARISTO PHARMACEUTICALS PVT LTD

Ordering notes

Delivery details are shown when the medicine is back in stock.
Returns & refunds: orders can be cancelled before dispatch; after dispatch, returns depend on the item category. Read the full policy

Composition of Megapen 1 g Injection Vial

Megapen 1 g Injection Vial contains Ampicillin + Cloxacillin. It belongs to the Penicillin class of medicines.

Uses of Megapen 1 g Injection Vial

  • This medicine is used in the treatment of bacterial infection
  • throat infection
  • chest infection
  • skin infection and urinary infection.

Key benefits

  • Long-established and effective
  • Works against a wide range of common infections

How Megapen 1 g Injection Vial works

Megapen 1 gm Injection is a combination of two antibiotics: Ampicillin and Cloxacillin. These antibiotics work by preventing the formation of the bacterial protective covering which is essential for the survival of bacteria. Together, they treat your infection effectively.

How to take Megapen 1 g Injection Vial

This is given by a doctor or a nurse. Do not attempt to inject it yourself unless you have been trained and told to. Follow the dose and the duration written on your prescription.

Take it exactly as your doctor prescribed. Do not change the dose or stop early on your own.

Missed dose and overdose

If you miss a dose

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.

If you take too much

An overdose of this medicine can cause vomiting, severe loose motions and, rarely, fits. Do not wait for symptoms to appear — go to the nearest emergency department and take the pack or strip with you.

Side effects of Megapen 1 g Injection Vial

Most side effects of Megapen are mild and settle as the body adjusts. Reported side effects include:

  • Allergic reaction Rash Stomach pain Nausea Diarrhea

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.

Safety advice for Megapen 1 g Injection Vial

PregnancyMegapen 1 gm Injection is probably safe to use during pregnancy.<br>Animal studies have shown low or no adverse effect on the foetus, however, there are limited human studies. Please consult your doctor.
BreastfeedingMegapen 1 gm Injection is probably safe to use during lactation. Limited human data suggests that the drug does not represent a significant risk to the baby.
AlcoholInteraction with alcohol is unknown. Please consult your doctor.
DrivingNot expected to affect your ability to drive.
KidneyMegapen 1 gm Injection should be used with caution in patients with kidney disease. Dose adjustment of Megapen 1 gm Injection may be needed. Please consult your doctor.<br>Regular monitoring of kidney function tests is advised while taking this medicine.
LiverMegapen 1 gm Injection should be used with caution in patients with liver disease. Dose adjustment of Megapen 1 gm Injection may be needed. Please consult your doctor.<br>Regular monitoring of liver function tests is advised while taking this medicine.
Habit formingNo

Warnings and precautions

Finish the whole course even after you feel better. Stopping early lets the strongest bacteria survive, and they are the ones that come back resistant. Stop and seek emergency care for swelling of the face or throat, difficulty breathing, or a widespread rash — a penicillin allergy can be serious. Tell every doctor and pharmacist if you have ever reacted to penicillin. Tell your doctor if loose motions become severe or watery, or continue after the course — this needs attention rather than an anti-diarrhoeal. Antibiotics do not work against colds, flu or most sore throats, which are caused by viruses.

Do not take Megapen if

Not for anyone with a known allergy to this medicine or to any ingredient in the pack. Not for anyone with a known penicillin allergy.

Interactions with other medicines

May reduce the reliability of the oral contraceptive pill if you have vomiting or loose motions — use additional precautions during the course. Tell your doctor if you take methotrexate or a blood thinner.

How to store Megapen 1 g Injection Vial

Store as printed on the carton — some injections need refrigeration and must not be frozen. Keep out of the reach of children.

Expert advice for Megapen 1 g Injection Vial

Space the doses evenly through the day so the level stays steady. Take a probiotic a few hours apart if loose motions trouble you, and drink plenty of fluids. Never use a leftover antibiotic, or someone else's, for a new illness.

Manufacturer and class

Manufacturer:
ARISTO PHARMACEUTICALS PVT LTD
Therapeutic class:
Antibiotic
Drug class:
Penicillin

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Megapen 1 g Injection Vial FAQs

What is Megapen 1 g Injection Vial used for?
Megapen 1 g Injection Vial is commonly used for This medicine is used in the treatment of bacterial infection, throat infection, chest infection, skin infection and urinary infection. Always follow your doctor's advice, this information is for educational purposes and not a substitute for professional medical guidance.
What is the salt in Megapen 1 g Injection Vial?
Megapen 1 g Injection Vial contains Ampicillin + Cloxacillin. If you are allergic to any of these active ingredients or excipients, do not take this medicine and speak to your doctor first.
How should I take Megapen 1 g Injection Vial?
This is given by a doctor or a nurse. Take it exactly as prescribed; do not change the dose or stop early without talking to your doctor.
How does Megapen 1 g Injection Vial work?
Megapen 1 gm Injection is a combination of two antibiotics: Ampicillin and Cloxacillin.
Is Megapen 1 g Injection Vial a prescription medicine?
Yes. Megapen 1 g Injection Vial is a prescription-only (Rx) medicine. Upload a valid prescription from a registered medical practitioner during checkout. We cannot dispense it without a valid Rx.
What are the common side effects of Megapen 1 g Injection Vial?
The side effects reported most often with Megapen are Allergic reaction Rash Stomach pain Nausea Diarrhea. Most are mild and settle as the body adjusts; tell your doctor if any of them persist or worry you, and stop the medicine and seek help at once for a rash, swelling of the face or lips, or difficulty breathing.
Can Megapen 1 g Injection Vial be taken during pregnancy?
Megapen 1 gm Injection is probably safe to use during pregnancy.<br>Animal studies have shown low or no adverse effect on the foetus, however, there are limited human studies. Always tell your doctor if you are pregnant, planning a pregnancy or breastfeeding before starting Megapen.
Can I drink alcohol while taking Megapen 1 g Injection Vial?
Interaction with alcohol is unknown.
What if I miss a dose of Megapen 1 g Injection Vial?
Take it as soon as you remember.
Is Megapen 1 g Injection Vial habit forming?
No. Megapen 1 g Injection Vial is not known to be habit forming when taken as prescribed.
How much does Megapen 1 g Injection Vial cost on PingMeDoc Pharmacy?
Megapen 1 g Injection Vial starts at ₹27 (MRP ₹29) on PingMeDoc Pharmacy. Available in injection 1 gm VIAL. Final price is confirmed at checkout and may vary by variant and location.
Who manufactures Megapen 1 g Injection Vial?
Megapen 1 g Injection Vial is manufactured by ARISTO PHARMACEUTICALS PVT LTD. PingMeDoc Pharmacy sources medicines only from licensed manufacturers and distributors.
How is Megapen 1 g Injection Vial delivered?
Megapen 1 g Injection Vial is delivered across India via our licensed pharmacy partners. Standard delivery timelines are confirmed at checkout. Chennai customers can opt for chargeable same-city express delivery.

Megapen 1 g Injection Vial, Quick facts

Salt
Ampicillin + Cloxacillin
Form
injection
Best price
₹27
MRP
₹29
Prescription
Required (Rx)
Brand
ARISTO PHARMACEUTICALS PVT LTD
Manufacturer
ARISTO PHARMACEUTICALS PVT LTD
Therapeutic class
Antibiotic
Drug class
Penicillin
Habit forming
No
Variants
injection 1 gm VIAL
Delivery
Standard across India

References

The information on Megapen 1 g Injection Vial 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.

  1. PingMeDoc clinical monograph library — compiled from Indian package inserts, the Indian Pharmacopoeia
  2. CDSCO schedules and standard pharmacology references. Reviewed for patient readability. This is general information, not a substitute for your doctor's advice.
  3. Central Drugs Standard Control Organisation (CDSCO), Ministry of Health & Family Welfare, Government of India, approved drug and schedule listings.
  4. National List of Essential Medicines (NLEM) 2022, Government of India.
  5. Manufacturer's package insert / prescribing information for Megapen 1 g Injection Vial.
  6. World Health Organization, ATC/DDD classification and Model Formulary for the active ingredient.

Next steps

Safety disclaimer

Product information is for general awareness and does not replace professional medical advice. Always follow a clinician's guidance and upload a valid prescription when required.