Generic Omnipen


Manufacturer: Pfizer Pharmaceutical

Active IngredientAmpicillin
TreatsBacterial infections
Drug ClassExtended spectrum Penicillin (Aminopenicillins {Penicillins})

Omnipen is a penicillin-type antibiotic. This medicine contains the active ingredient Ampicillin, which belongs to a group of drugs known as aminopenicillins. The antibiotic is an effective medicine that treats infections of the middle ear, sinuses, stomach and intestines, bladder, and kidney caused by susceptible bacteria.

SKU: Pfizer Omnipen Categories: ,

Available Options

Generic Omnipen - 250mg

Pack SizePrice/unitPriceQtyAdd to cart
90 pills$0.23$20.70
120 pills$0.22$26.77
180 pills$0.21$38.50
240 pills$0.20$49.13
300 pills$0.19$57.96

Generic Omnipen - 500mg

Pack SizePrice/unitPriceQtyAdd to cart
90 pills$0.25$22.50
120 pills$0.24$29.10
180 pills$0.23$41.85
240 pills$0.22$53.40
300 pills$0.21$63.00


Active Ingredient

This antibiotic has an active ingredient Ampicillin. This ingredient belongs to a class of drugs known as aminopenicillins. It kills bacteria by preventing them from making the protein needed to build their cell walls. This ingredient is a broad-spectrum, semi-synthetic, beta-lactam penicillin antibiotic with bactericidal activity.


Antibiotic medicine treats and prevents many different types of infections like bladder infections, pneumonia, meningitis, gonorrhea, and infections of the stomach, intestines, heart, or blood. This medicine Omnipen should not be used for viral infections like the common cold or flu. It is also used to treat urinary tract caused by E.coli, Pseudomonas aeruginosa, Enterococci, and Klebsiella pneumonia. It can be used in the treatment of endocarditis which is an inflammation of the heart caused by Streptococcus species.

Action Mechanism

The medicine can alter the normal bacteria in the colon and encourage the overgrowth of some bacteria such as Clostridium difficile which causes inflammation of the colon i..e pseudomembranous colitis.


The medicine is a penicillin-type antibiotic that treats bacterial infections. The given medicine Omnipen is available in dosages as mentioned below:

  • 250 mg: Take this medicine on an empty stomach, 1 hour before or 2 hours after a meal with a full glass of water
  • 500 mg: It is recommended to take 1 hour before or 2 hours after a meal on an empty stomach.

Uses Of Omnipen

  • Bacterial endocarditis prophylaxis
  • Endocarditis
  • Intraabdominal infection
  • Meningitis
  • Tuberculosis
  • Streptococcemia
  • Infection – bacterial/fungal/protozoal/viral
  • Inhalation bacillus anthracis
  • Cutaneous bacillus anthracis
  • Typhoid fever
  • Peritonitis
  • Pharyngitis
  • Pneumonia
  • Shigellosis
  • Sinusitis
  • Skin or soft tissue infection
  • Upper respiratory tract infection
  • Septicemia
  • Bacterial infection
  • Urinary tract infection
  • Bronchitis
  • Surgical prophylaxis
  • Gastroenteritis

Side Effects

  •  Nausea
  •  Abdominal pain
  •  Headache
  •  Vomiting
  •  Diarrhea
  •  Allergy

What’s the most important statistics i need to know approximately ampicillin (omnipen)?

You should not use this medicinal drug if you are allergic to ampicillin or any similar antibiotic, such as amoxicillin (amoxil, augmentin, moxatag, and others), dicloxacillin, nafcillin, or penicillin.

Inform your medical doctor if you have ever had:

  • Diabetes
  • Hay fever
  • Asthma
  • Kidney disorder
  • An hypersensitivity to a cephalosporin antibiotic

Tell your health practitioner in case you are pregnant. Ampicillin can make start manage drugs less effective. Ask your physician about using non hormonal birth manipulate (condom, diaphragm with spermicide) to save you being pregnant.


Drink plenty of fluids while treating with this medicine. This medicine should be taken as prescribed by the doctor.

Additional information


250mg, 500mg


90 pills, 120 pills, 180 pills, 240 pills, 300 pills


$0.23, $0.22, $0.21, $0.20, $0.19


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