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Dosage Package Price per pill, $ Price, $ Buy
250mgX90 90 0.37 33.30
250mgX120 120 0.29 34.80
500mgX10 10 1.50 15.00
500mgX20 20 1.20 24.00

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Ampicillin Tablets

Penbritin capsules, syrup and injection all contain the active ingredient ampicillin, which is a type of antibiotic called a penicillin. Ampicillin is prescribed to treat infections caindicated by bacteria. The injection is prescribed to treat more serious infections, or in cases where the drug can't be taken by mouth.

Ampicillin works by interfering with the ability of bacteria to form cell walls. The cell walls of bacteria are vital for their survival. They keep unwanted substances from entering their cells and stop the contents of their cells from leaking out. Ampicillin impairs the bonds that hold the bacterial cell wall together. This allows holes to appear in the cell walls and so kills the bacteria.

Ampicillin is a broad-spectrum antibiotic which kills a wide variety of bacteria that cause a wide variety of commonly-occuring infections. Ampicillin may be prescribed to treat infections of:
- Ears;
- Nose;
- The airways;
- Throat Ampicillin may also be prescribed to treat:
- Certain infections affecting the blood or internal organs;
- Certain sexually-transmitted infections;
- Urine infections;

To make sure the bacteria causing an infection are susceptible to ampicillin your doctor may need to take a tissue sample, for example a swab from the throat or skin, or a urine or blood sample.

This belongs to the group of drugs known as antibiotics.

Ampicillin is prescribed to treat bacterial infections, such as infections of the chest and ear, by killing or stopping the growth of bacteria. Ampicillin can also be prescribed to prevent infections occurring in high-risk patients.

Ampicillin is available in capsule, oral liquid and injection form.

Ampicillin Antibiotic

Ampicillin is one of the most widely prescribed antibiotics. Ampicillin is considered a penicillin and is a close relative of another penicillin, amoxicillin. Unlike penicillin, ampicillin and amoxicillin can penetrate and prevent the growth of certain types of bacteria, called gram-negative bacteria. Ampicillin is prescribed mainly to treat infections of:
- Bladder;
- Kidney;
- Sinuses;
- The middle ear;
- Uncomplicated gonorrhea;
Ampicillin is prescribed intravenously to treat meningitis and other serious infections.

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Bacterial infections of:
- Eg otitis media;
- Nose and throat;
- Sinusitis;
- The ear;

Bacterial infections of the urinary tract.
Gynaecological infections, eg gonorrhoea.
Bacterial infection of the blood (septicaemia or blood poisoning).
Bacterial infections in the abdomen (peritonitis).
Bacterial infections of the stomach and intestines.
Bacterial infection of the heart valves and the lining surrounding the heart (bacterial endocarditis).
Bacterial meningitis.
Typhoid and paratyphoid fever.

Oral ampicillin is effective against susceptible bacteria causing infections of:
- Bladder;
- Kidney;
- Sinuses;
- The middle ear;
Only mild to moderate infections are treated with oral ampicillin. Bacteria against which ampicillin often is effective include:
- Bordetella pertussis;
- Enterococci;
- Gardnerella vaginalis;
- Listeria monocytogenes;
- Neisseria gonorrhoeae;
- Neisseria meningitidis;
- Proteus mirabilis;
- Salmonella;
- Shigella;
- Some E coli;
- Some Hemophilus influenzae;
Susceptibilities of bacteria to antibiotics vary from location to location. Thus, some doctors may use ampicillin or amoxicillin first for some infections, whereas other doctors may use more "broad-spectrum" antibiotics.

Ampicillin Side effects

Abdominal pain;
Blood disorders;
Diarrhea or loose stools;
Inflammation of the large intestine (colitis);
Itching (pruritus);
Liver or kidney disorders;
Loss of appetite;
Nausea (feeling sick);
Nausea or vomiting;
Tummy pains;
Vomiting (being sick);

Ampicillin Forms

Tablets: 250 milligrams;
Tablets: 500 milligrams.
Oral suspension: 100 milligrams/1 milliliter;
Oral suspension: 125 milligrams/5 milliliters;
Oral suspension: 250 milligrams/5 milliliters.

Ampicillin Dosages

Food in the stomach reduces how much and how quickly ampicillin is absorbed. Administration should be either 1 hour prior to or 2 hours following a meal for maximal absorption. However, for persons who experience nausea or stomach distress after taking ampicillin, Ampicillin may be taken with meals. Ampicillin most often is given four times a day for 7 to 14 days.
When prescribed to treat gonorrhea, Ampicillin is given as a single large dose (for example, seven 500 milligrams capsules) with probenecid. The probenecid slows down the elimination of the ampicillin so that the ampicillin remains in the body longer.

Ampicillin Prescription

Ampicillin is a penicillin-like antibiotic prescribed for a wide variety of infections, including gonorrhea and other genital and urinary infections, respiratory infections, and gastrointestinal infections, as well as meningitis (inflamed membranes of the spinal cord or brain).
If you are allergic to either penicillin or cephalosporin antibiotics in any form, consult your doctor before taking ampicillin.
If you take the drug and develop a skin reaction, diarrhea, shortness of breath, wheezing, sore throat, or fever, seek medical attention immediately.
There is a possibility that you are allergic to both types of medication and if a reaction occurs, it could be extremely severe.

Ampicillin Side Effects

Ampicillin side effects that you should report to your health care professional or doctor as soon as possible:

Side effects may include:
- Vomiting;
- Sore tongue or mouth;
- Rash or other skin problems;
- Nausea;
- Itching;
- Fever;
- Diarrhea;
- Colitis (inflammation of the bowel);

Ampicillin Contraindications

Ampicillin is contraindicated if you have any of the following conditions:
- If your symptoms do not improve or seem to get worse;
- If you have an allergic reaction;
- If you are allergic to penicillin or cephalosporin antibiotics;

Ampicillin Interactions

Do not take Ampicillin with any of the following drugs:
- Oral contraceptives;
- Mefloquine (lariam);
- Chloroquine (aralen);
- Atenolol (tenormin);
- Allopurinol (zyloprim);

Ampicillin Dosage


Children weighing 44 pounds or less should have their dosage determined by their weight.

Children weighing over 44 pounds should follow the adult dose schedule.

Respiratory Tract Infections

The usual dose is 50 milligrams for each 2.2 pounds of body weight daily, divided into 3 to 4 doses.

Infections of the Genital, Urinary, or Gastrointestinal Tracts

The usual dose is 100 milligrams for each 2.2 pounds of body weight daily, divided into 4 doses for the capsules, and 3 to 4 doses for the suspension.


Infections of the Genital, Urinary, or Gastrointestinal Tracts

The usual dose is 500 milligrams, taken every 6 hours.

Respiratory Tract Infections

The usual dose is 250 milligrams, taken every 6 hours.


The usual dose is 3.5 grams in a single oral dose along with 1 gram of probenecid

Ampicillin Overdose

Although no specific symptoms have been reported, any medication taken in excess can have serious consequences. If you suspect an overdose of ampicillin, seek medical attention immediately.