Description

Megapen 500mg Injection is a broad-spectrum injectable antibiotic for the treatment of serious bacterial infections. It combines:

Ampicillin (250mg): A penicillin-class antibiotic that inhibits bacterial cell wall synthesis, effective against Gram-positive and some Gram-negative bacteria.
Cloxacillin (250mg): A penicillinase-resistant antibiotic that targets penicillin-resistant Staphylococcus aureus.

The combination ensures enhanced antibacterial coverage, suitable for infections requiring parenteral therapy.

Uses / Indications

Respiratory tract infections (pneumonia, bronchitis)
Ear, nose, and throat infections (tonsillitis, sinusitis)
Skin and soft tissue infections (cellulitis, abscesses)
Bone and joint infections
Urinary tract infections (UTIs)
Systemic bacterial infections
Mixed bacterial infections requiring broad coverage

How It Works

Ampicillin disrupts bacterial cell wall synthesis, causing bacterial death.
Cloxacillin resists penicillinase enzymes, maintaining efficacy against resistant strains.
Together, they provide broad-spectrum antibacterial activity, covering susceptible and penicillinase-producing bacteria.

Dosage & Administration

Administered intravenously (IV) or intramuscularly (IM) as prescribed.
Dosage depends on infection severity, patient age, and renal function.
Typically, 500mg–1g per day divided into 2–4 doses for adults; pediatric dosing is weight-based.
Administer under medical supervision, monitoring for allergic reactions.

Side Effects

Common:

Mild nausea or stomach upset
Diarrhea
Pain, redness, or swelling at injection site

Less Common / Rare:

Allergic reactions (rash, itching, hives)
Dizziness or headache

Serious (rare):

Severe allergic reactions (anaphylaxis)
Liver dysfunction (elevated liver enzymes, jaundice)
Clostridium difficile-associated diarrhea

Precautions & Warnings

Avoid in patients with penicillin allergy.
Use cautiously in patients with renal or hepatic impairment.
Complete the prescribed course to prevent resistant bacterial infections.
Monitor closely for allergic reactions, especially in patients with prior hypersensitivity.

Summary

Megapen 500mg Injection (Ampicillin 250mg + Cloxacillin 250mg) is a broad-spectrum injectable antibiotic suitable for respiratory, skin, urinary, bone, and systemic infections. It provides enhanced antibacterial coverage and must be used under strict medical supervision, following prescribed dosage and duration.

Megapen 500mg Injection