Ampicillin is a type of penicillin antibiotic that treats some bacterial infections. The brand name of this medication is Principen. What is ampicillin? Ampicillin is a penicillin antibiotic that is used to treat or prevent many different types of infections such as bladder infections, pneumonia, gonorrhea, meningitis, or infections of the stomach or intestines. Ampicillin is an antibiotic used for treating infections of the middle ear, sinuses, stomach and intestines, bladder, and kidney caused by susceptible bacteria. It also is used for treating uncomplicated gonorrhea, meningitis, endocarditis, and other serious infections. Learn about ampicillin usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Ampicillin is a prescription penicillin-type antibiotic used to treat many different types of infections caused by bacteria, such as ear infections, bladder infections, pneumonia, gonorrhea, and E. coli or salmonella infection. Detailed Ampicillin dosage information for adults and children. Includes dosages for Bacterial Infection, Urinary Tract Infection, Sinusitis and more; plus renal, liver and dialysis adjustments. Ampicillin is an antibiotic that is commonly used for infections caused by certain bacteria. Ampicillin may not be appropriate for all infections, depending on which germs are causing the. Ampicillin: learn about side effects, dosage, special precautions, and more on MedlinePlus Ampicillin is an antibiotic belonging to the aminopenicillin class of the penicillin family. The drug is used to prevent and treat several bacterial infections, such as respiratory tract infections, urinary tract infections, meningitis, salmonellosis, and endocarditis. [6] Ampicillin is a widely used aminopenicillin antibiotic with activity against susceptible gram-positive organisms, including Enterococcus species and Listeria monocytogenes, as well as selected gram-negative pathogens.