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US Brand Name Omnipen 250
Generic Name Ampicillin
Other Brand Name Ampisyn, Campicillin
Manufacturer LYKA, Cipla, Cadila
Packing 10, 15
Form Capsule
Strength 500 mg, 250 mg

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Generic Omnipen belongs to penicillins class of antibiotics and are used for treating bacterial infections. This antibiotic works by stopping bacteria from multiplying by preventing them from forming the walls in which they are surrounded. The walls formed by the bacteria are essential as it protects them from their environment and also keep the contents of the bacterial cell together, thus bacteria cannot survive without a cell wall. Therefore generic Omnipen are found effective when bacteria are actively multiplying and forming cell walls.


Generic Omnipen is used for treating infections, which are generally caused by susceptible bacteria like infections of the middle ear, stomach and intestines, sinuses, bladder, and kidney. The medication is also used for treating uncomplicated meningitis, gonorrhea, endocarditis and other serious infections.

Side effects

Patients experiencing any of the side effects need to immediately seek medical attention to avoid any serious consequences. It is not necessary for each and every patient taking generic Omnipen to experience any side effects but some of the patients may experience some of the following side effects: • Fever • Headache • Unusual weakness • Sore Throat • Body aches • Watery or bloody diarrhea • Red skin rash • Flu symptoms • Easy bruising or bleeding • Nausea • Stomach pain People experiencing any of these problems should immediately seek medical attention before it becomes unusual or bothersome.


Generic Omnipen capsules must be stored at room temperature in a tightly closed container. The medication must be kept out of reach of children and pets.


Active ingredient in generic Omnipen is ampicillin.

Important Precautions

People are not recommended to use this medicine if they are allergic to ampicillin or to any other penicillin antibiotic like amoxicillin, carbenicillin, dicloxacillin, or oxacillin. Prior taking generic Omnipen the patients should notify their doctor if they are allergic to drugs like Ceftin, Keflex, Duricef, Ceclor or if they are suffering from any of the following conditions like: • Kidney disease • Asthma • Bleeding or blood clotting disorder • Mononucleosis • Diarrhea

Dosage and administration

Generic Omnipen must be taken exactly as prescribed by the doctor and patients should strictly follow the actual dosage prescribed by the doctor. Generally in case of infections, patients are prescribed with 250 to 500 mg of capsules taken four times in a day for a period of seven to fourteen days.
Generic Omnipen capsules must be administered with glass full of water and should be taken on an empty stomach. Thus, one can take the medication at least one hour before or after two hour taking the meal.


Overdose condition must be treated on emergency basis as it can lead to serious consequences. Symptoms of overdose include severe skin rash, confusion, behavior change and urinating less than usual.