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Ampicillin Prescription
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Generic Name: ampicillin (oral) (am pi SIL in)
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Physician reviewed ampicillin patient information - includes ampicillin description, dosage and directions.
Generic Name: ampicillin (oral) (am pi SIL in)
Brand Name:
Physician reviewed ampicillin patient information - includes ampicillin description, dosage and directions.
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30 tablets of Ampicillin 40 mg
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Ampicillin Drug Information:

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 may also be used for purposes not listed in this medication guide. Follow all directions on your medicine label and package. Tell each of your healthcare prOviders about all your medical conditions, allergies, and all medicines you use. You should not use ampicillin if you are allergic to ampicillin or any similar antibiotic, such as Amoxicillin (Amoxil, Augmentin, Moxatag, and others), dicloxacillin, Nafcillin, or penicillin. Learn more

Ampicillin Side Effects

In Summary

Commonly reported side effects of ampicillin include: eosinophilia and skin rash. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to ampicillin: oral capsules, oral for suspension, parenteral powder for injection or infusion

Side effects include:

GI effects (diarrhea, nausea), rash.

For Healthcare Professionals

Applies to ampicillin: compounding powder, injectable powder for injection, oral capsule, oral powder for reconstitution


Very common (10% or more): Rash, pruritus, exanthema, itching

Common (1% to 10%): Morbilliform rash

Uncommon (0.1% to 1%): Angioneurotic edema, allergic vasculitis, exfoliative dermatitis, exudative erythema multiforme, urticaria, Stevens-Johnson syndrome, toxic epidermal necrolysis

Frequency not reported: Erythematous maculopapular rash (including mildly pruritic), macular rash, purpura, maculopapular rash, skin reactions (e.g., erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis), other skin rashes, erythematous eruptions, acute generalized exanthematous pustulosis


Glossitis, stomatitis, black hairy tongue, nausea, vomiting, enterocolitis, pseudomembranous colitis, and diarrhea were typically associated with oral formulations.

Acute pancreatitis has been reported and confirmed by rechallenge with this drug in a patient in whom there was no other obvious cause of pancreatitis.

Very common (10% or more): Diarrhea, nausea, vomiting, flatulence/meteorism, soft stools, abdominal pain

Uncommon (0.1% to 1%): Glossitis, stomatitis, enterocolitis, pseudomembranous colitis

Frequency not reported: Oral candidiasis/moniliasis, black hairy tongue, Clostridium difficile-associated diarrhea, hemorrhagic colitis, sore mouth/tongue, pancreatitis, gastritis, generalized abdominal cramps


Common (1% to 10%): Localized phlebitis

Frequency not reported: Phlebitis at IV administration site, pain at IM administration site


Common (1% to 10%): Swelling and pain, exanthema and enanthem in the oral region

Uncommon (0.1% to 1%): Infection with fungi/resistant bacteria (especially during prolonged and/or repeated use), drug fever

Frequency not reported: Fever (including high fever)


Uncommon (0.1% to 1%): Serious allergic reactions (e.g., serum sickness, allergic nephritis)

Rare (0.01% to 0.1%): Life-threatening anaphylactic shock

Frequency not reported: Anaphylaxis, serum sickness-like reactions, hypersensitivity reactions (including urticarial rash, erythema multiforme, exfoliative dermatitis, edema, hypotension, fever, eosinophilia, dyspnea, interstitial nephritis, Henoch-Schonlein purpura, focal glomerulonephritis, Stevens-Johnson syndrome, bullous pemphigoid, hypersensitivity myocarditis, toxic epidermal necrolysis, fixed drug eruptions)


Uncommon (0.1% to 1%): Thrombocytopenia, thrombocytopenic purpura, leukopenia, anemia, eosinophilia, agranulocytosis, hemolytic anemia

Very rare (less than 0.01%): Granulocytopenia, pancytopenia, prolonged bleeding time, prolonged prothrombin time

Frequency not reported: Prolonged activated partial thromboplastin time, platelet aggregation abnormalities, neutropenia, Henoch Schonlein purpura, red cell aplasia

Anemia, thrombocytopenia, hemolytic anemia, thrombocytopenic purpura, eosinophilia, leukopenia, and agranulocytosis have been reported during treatment with penicillins. In general, these reactions were reversible after stopping therapy and were believed to be sensitivity reactions.

Neutropenia was described in a case report of 3 pediatric patients who received high doses (150 to 400 mg/kg) of this drug IV. In all 3 cases, white blood cell and neutrophil counts returned to normal after discontinuation of therapy.

Nervous system

Seizures have been reported with renal dysfunction or at very high IV doses.

Seizures have been reported in patients with high serum drug levels, although these patients were otherwise very ill. High cerebral spinal fluid (CSF) levels of some penicillins were known to be potentially neurotoxic, and the CSF level of this drug increased significantly in meningitis.

Generalized seizures have been described in 2 patients during use of this drug, although in both cases, there were underlying disease factors that may have predisposed the patients to seizure activity.

Encephalopathy has occurred when blood drug level reached 800 mg/L.

Toxic symptoms (e.g., drowsiness, hyperreflexia, myoclonic twitches, convulsions, coma) have occurred at lower drug levels in patients with meningitis; the blood-brain barrier became more permeable in meningitis.

Rare (0.01% to 0.1%): Headache, dizziness, myoclonus, seizures

Frequency not reported: Encephalopathy, drowsiness, hyperreflexia, myoclonic twitches, convulsions, coma


Uncommon (0.1% to 1%): Acute interstitial nephritis

Very rare (less than 0.01%): Acute renal failure with excretion of urine crystals

Frequency not reported: Interstitial nephritis, nephropathy, glomerulonephritis


Uncommon (0.1% to 1%): Transaminase elevation

Frequency not reported: Hepatitis, cholestatic jaundice, elevated AST, moderately increased transaminases (transient), elevated ALT, cholestasis

Mild, temporary elevation in AST reported in patients who received larger (2 to 4 times) and more frequent IM injections than usual. Evidence indicated AST was released at IM injection sites for this drug and increased AST did not necessarily indicate liver involvement.


Crystalluria has been reported with high-dose IV administration.

Uncommon (0.1% to 1%): Crystalluria

Frequency not reported: Vaginal candidiasis/moniliasis


Uncommon (0.1% to 1%): Laryngeal edema

Frequency not reported: Laryngeal stridor


Frequency not reported: Arthralgia


Frequency not reported: Anorexia

Editorial References and Review

Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/27/2021.

Source: Drugs.com Ampicillin (www.drugs.com/ampicillin.html).