Ampicillin
Ampicillin is an antibiotic used to treat bacterial infections. The listed catalogue includes Principen, while the established brand Penbritin is also associated with this compound. It targets a wide range of bacteria across different body systems.
Key points
- Used for infections reaching the respiratory tract, urinary tract, gut or the membranes around the brain, such as meningitis.
- May reduce how well oral contraceptives work and can raise the chance of a skin rash when taken with allopurinol.
- Supplied as a hard capsule, typically dosed for adults and adolescents rather than young children.
What is Ampicillin?
Ampicillin belongs to the penicillin group of antibiotics. It stops bacteria from building their protective cell walls, which kills them and clears the infection. Because it has been used for decades, both originator brands and generic versions exist.
What Ampicillin is used for
Ampicillin treats Bacterial Infection in various parts of the body. These can include the respiratory tract, urinary tract, gastrointestinal system and meningitis. A doctor selects it when the bacteria causing your illness are confirmed or expected to be susceptible to this particular antibiotic.
Ampicillin brands and forms
Principen comes as a hard capsule. The established brand Penbritin is also linked to this active compound. Capsules are typically used for adult and adolescent dosing. You can browse related options under Antibiotics.
Safety overview for Ampicillin
What to check before using this medicine
Ampicillin is not suitable if you have a penicillin or cephalosporin allergy. Review your full allergy history with a healthcare provider before starting any penicillin-based medication.
Possible reactions and tolerability
Skin rash, diarrhoea and stomach discomfort are the most commonly reported reactions. Diarrhoea can sometimes indicate a more serious intestinal issue, so report persistent or severe symptoms to your doctor.
Interactions and health factors
Ampicillin may reduce the effectiveness of oral contraceptives. It can also interact with allopurinol, increasing the likelihood of a skin rash. Adjustments may be needed if your kidneys filter medications more slowly than usual.
Product labelling and verified clinical sources remain the correct references for specific contraindications, interactions and reactions.
Further reading
What is ampicillin used for?
Ampicillin is an antibiotic used to treat bacterial infections. These can include infections of the respiratory tract, urinary tract, gastrointestinal system and meningitis.
How does ampicillin work?
Ampicillin is a beta-lactam antibiotic in the penicillin group. It interferes with bacterial cell wall synthesis, stopping bacteria from building their protective cell walls, which kills them and clears the infection.
Ampicillin vs penicillin: what is the difference?
Ampicillin belongs to the penicillin group of antibiotics and is a beta-lactam antibiotic. Unlike penicillin, it is a broad-spectrum antibiotic used for infections of the respiratory tract, urinary tract, gut and the membranes around the brain, such as meningitis.
What are the side effects of ampicillin?
The most commonly reported reactions are skin rash, diarrhoea and stomach discomfort. Nausea, rash and urticaria are also listed, and diarrhoea can sometimes indicate a more serious intestinal issue. Report persistent or severe symptoms to your doctor.
Can ampicillin be taken with other medicines?
Ampicillin may reduce the effectiveness of oral contraceptives. It can also interact with allopurinol, increasing the likelihood of a skin rash, and it interacts with methotrexate. Ask a doctor or pharmacist about your other medicines.
Who should not take ampicillin?
Ampicillin is not suitable if you have a penicillin or cephalosporin allergy. Adjustments may be needed if your kidneys filter medications more slowly than usual.
In which products can I find ampicillin?
Products containing ampicillin include Principen. Compare forms, strengths and packs in the listings above.
What brand names is ampicillin sold under?
Besides the products listed here, ampicillin is sold under brand names such as Penbritin. Names differ from country to country, so the active ingredient is the surest way to compare.
Can I buy ampicillin over the counter in Thailand?
Yes. In Thailand ampicillin is sold by pharmacists without a prescription, and Yasabai does not ask for one either. We are an online store, not a dispensing pharmacy; we arrange your order and delivery on your behalf.
Ordering without a prescription →Can I order ampicillin online in Thailand?
Yes. Our pharmacy partners ship from India to Thailand and across Asia in discreet packaging. Standard Airmail takes up to 3 weeks; Express Tracked Courier takes up to 1 week.
How ordering works →