Ampicillin is an antibiotic.



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Drug Uses

Ampicillin is used to fight infections such as ear infections, bladder infections, pneumonia, gonorrhea, and E. coli or salmonella infection.


Following the dosage instructions of your doctor is the best way to use any medication. If you are unsure or do not remember the instructions then you may read the medicine label for more detailed information.

You may choose to take Ampicillin with a meal to avoid an upset stomach or without one.

Please drink a full glass of water with ampicillin.

It is very important that you complete the dosage schedule and do not interrupt it in between without seeking prior consultation from your doctor.

Taking your medication at the same time each day is a tried and tested method to avoid missing any doses.

Drug Class and Mechanism

Ampicillin, an antibiotic, works by killing sensitive bacteria.

Missed Dose

Despite your best attempts at remembering, if you still miss out on a dose, then take it as soon as you remember about it. But keep in mind that you will have to adjust your next dose by spacing it out by 4 to 5 hours. If this is not possible, then the best thing to do would be to skip the missed dose and continue with your normal dosage schedule.

Never try to compensate for the missed dose by taking a double dose together. It may cause adverse effects.


Store ampicillin at room temperature 20 and 25 degrees C (read medicine label if unsure). Always keep it in a cool dark place that is not directly exposed to sources of heat or moisture and sunlight. Protect it from kids and pets.


Doctors advise against using ampicillin if you are allergic to any ingredient in it or if you have conditions like stomach infection, diarrhea, or mononucleosis.

Discuss your past/current medical history in detail with your doctor before beginning treatment with any new medication. If you are using any herbal supplements or over the counter medication, including vitamin pills, then mention it to your doctor.

Anti Biotic

Being an antibiotic ampicillin cannot be used for treating viral infections common cold and flu. So, you must avoid contact with people who have viral infections.

Some patients using antibiotics have reported extreme stomach cramps which are followed by bloody or tarry stools. If you notice this, then contact your physician immediately.

Constant usage of ampicillin has led to a re-infection which is more severe than the first. Hence, doctors will constantly monitor your condition closely while using ampicillin.
Ampicillin is in the FDA Category

If you are expecting a child or are planning to have a child in the near future, then consult your doctor before using ampicillin to discuss any possible threats to the unborn baby.

If you are a nursing mother and breast feed your baby, then too, seek consultation before using ampicillin as some drugs are excreted in the breast milk and may enter the baby.