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Description References
Ampicillin structure
Chemical Name:
Molecular Formula:
Formula Weight:
MOL File:

Ampicillin Properties

Melting point:
208 °C (dec.)(lit.)
Boiling point:
refractive index 
265 ° (C=0.1, H2O)
Flash point:
87 °C
storage temp. 
NH4OH 1 M: 50 mg/mL, clear, colorless
white to off-white
2.5 (COOH)(at 25℃)
Water Solubility 
0.1-1 g/100 mL at 21 ºC
CAS DataBase Reference
7177-48-2(CAS DataBase Reference)
EPA Substance Registry System
4-Thia-1-azabicyclo( 3.2.0)heptane-2-carboxylic acid, 6-[[(2R)-aminophenylacetyl] amino]-3,3-dimethyl-7-oxo-, trihydrate, (2S,5R,6R)-(7177-48-2)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xn,Xi
Risk Statements  36/37/38-42/43
Safety Statements  22-26-36/37-36-45-23
WGK Germany  2
RTECS  XH8425000
HS Code  29411020
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled Sensitisation, respiratory Category 1 Danger P261, P285, P304+P341, P342+P311,P501
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
H362 May cause harm to breast-fed children Reproductive toxicity, effects on or via lactation Additional category P201, P260, P263, P264, P270,P308+P313
Precautionary statements:
P201 Obtain special instructions before use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P263 Avoid contact during pregnancy/while nursing.
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P284 Wear respiratory protection.
P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P308+P313 IF exposed or concerned: Get medical advice/attention.
P342+P311 IF experiencing respiratory symptoms: call a POISON CENTER or doctor/physician.
P405 Store locked up.

Ampicillin price More Price(12)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 31591 Ampicillin trihydrate VETRANAL 7177-48-2 250mg $40.7 2018-11-20 Buy
Sigma-Aldrich A1593 Ampicillin meets USP testing specifications 7177-48-2 25g $181 2018-11-20 Buy
TCI Chemical A2092 Ampicillin Trihydrate >98.0%(HPLC)(T) 7177-48-2 5g $26 2018-11-22 Buy
TCI Chemical A2092 Ampicillin Trihydrate >98.0%(HPLC)(T) 7177-48-2 25g $77 2018-11-22 Buy
Alfa Aesar J66514 Ampicillin trihydrate 7177-48-2 100g $165 2018-11-13 Buy

Ampicillin Chemical Properties,Uses,Production


As a penicillin group of beta-lactam antibiotics, Ampicillin is the first broad-spectrum penicillin, which has in vitro activity against Gram-positive and Gram-negative aerobic and anaerobic bacteria, commonly used for preventing and treating bacterial infections of respiratory tract, urinary tract, middle ear, sinuses, stomach and intestines, bladder, and kidney, etc. caused by susceptible bacteria. It is also used to treat uncomplicated gonorrhea, meningitis, endocarditis salmonellosis, and other serious infections through administered by mouth, intramuscular injection or by intravenous infusion. Like all antibiotics, it is not effective for the treatment of viral infections.
Ampicillin functions by killing the bacteria or preventing their growth. After penetrating Gram-positive and Gram-negative bacteria, it acts as an irreversible inhibitor of the enzyme transpeptidase needed by bacteria to make the cell wall, which results to the inhibition of cell wall synthesis and eventually leads to cell lysis.


Chemical Properties

White or almost white, crystalline powder.

Chemical Properties

Ampicillin in anhydrous form occurs as crystals.


Penicillin antibacterial.

brand name

Amcill (Parke-Davis); Omnipen (Wyeth-Ayerst); Polycillin (Apothecon); Principen (Apothecon).

Antimicrobial activity

Ampicillin is slightly less active than benzylpenicillin against most Gram-positive bacteria but is more active against E. faecalis. MRSA and strains of Str. pneumoniae with reduced susceptibility to benzylpenicillin are resistant. Most group D streptococci, anaerobic Gram-positive cocci and bacilli, including L. monocytogenes, Actinomyces spp. and Arachnia spp., are susceptible. Mycobacteria and nocardia are resistant.
Ampicillin has similar activity to benzylpenicillin against N. gonorrhoeae, N. meningitidis and Mor. catarrhalis. It is 2–8 times more active than benzylpenicillin against H. influenzae and many Enterobacteriaceae, but β-lactamase-producing strains are resistant. Pseudomonas spp. are resistant, but Bordetella, Brucella, Legionella and Campylobacter spp. are often susceptible. Certain Gram-negative anaerobes such as Prevotella melaninogenica and Fusobacterium spp. are susceptible, but B. fragilis is resistant, as are mycoplasmas and rickettsiae.
Activity against molecular class A β-lactamase-producing strains of staphylococci, gonococci, H. influenzae, Mor. catarrhalis, certain Enterobacteriaceae and B. fragilis is enhanced by the presence of β-lactamase inhibitors, specifically clavulanic acid.
Its bactericidal activity resembles that of benzylpenicillin. Bactericidal synergy occurs with aminoglycosides against E. faecalis and many enterobacteria, and with mecillinam against a number of ampicillin-resistant enterobacteria.

Acquired resistance

β-Lactamase-producing pathogens, including most clinical isolates of Staph. aureus, are resistant. Strains of pneumococci, enterococci, gonococci and H. influenzae with altered PBPs have reduced susceptibility to ampicillin. Isolates of N. gonorrhoeae and H. influenzae with a TEM plasmid- mediated β-lactamase (which are more common) are fully resistant. Resistance among H. influenzae is often linked with resistance to chloramphenicol, erythromycin or tetracycline, due to plasmid-encoded resistance markers that are co-transferred with the gene for the TEM enzyme. However, at least 70% of current H. influenzae isolates remain susceptible to ampicillin worldwide.
The widespread use of ampicillin and other aminopenicillins has led to resistance becoming common in formerly susceptible species of enteric pathogens as a result of the widespread dissemination of plasmid-mediated β-lactamases. Surveillance data from North America and Europe indicate less than 50% susceptibility to ampicillin in Esch. coli. At least 90% of current isolates of Mor. catarrhalis are β-lactamaseproducing strains. Ampicillin-resistant strains of salmonellae, notably S. enterica serotypes Typhi and Typhimurium (many of which are also resistant to chloramphenicol, sulfonamides and tetracyclines) present a serious problem in Africa, Asia and South America. Multiresistant strains of shigellae also predominate in many parts of the world.

General Description

Odorless white microcrystalline powder with a bitter taste. A 0.25% solution in water has a pH of 3.5 to 5.5.

Air & Water Reactions

Slightly soluble in water.

Reactivity Profile

Ampicillin absorbs insignificant amounts of moisture at 77° F and relative humidities up to approximately 80%, but under damper conditions Ampicillin absorbs significant amounts. A pH-rate profile reveals specific-acid- and specific-base- catalyzed hydrolysis. The pH of maximum stability is 5.8.

Fire Hazard

Flash point data for Ampicillin are not available; however, Ampicillin is probably combustible.

Contact allergens

Ampicillin caused contact dermatitis in a nurse also sensitized to amoxicillin (with tolerance to oral phenoxymethylpenicillin) and in a pharmaceutical factory worker. Systemic drug reactions are common. Crossreactivity is regular with ampicillin and can occur with other penicillins.


Oral absorption: 30–40%
Cmax 500 mg oral: 3.2 mg/L after c. 2 h
500 mg intramuscular: 5–15 mg/L after 1 h
500 mg intravenous infusion: 12–29 mg/L
Plasma half-life: 1–1.5 h
Volume of distribution: 0.38 L/kg
Plasma protein binding: 20%
Absorption and distribution
Ampicillin is highly stable to acid: in 2 h at pH 2 and 37°C, only 5% of activity is lost. Absorption is impaired when it is given with meals. It is distributed in the extracellular fluid. Adequate concentrations are obtained in serous effusions. Effective CSF levels are obtained only in the presence of inflammation, variable peak concentrations around 3 mg/L being found in the first 3 days of treatment in patients receiving 150 mg/kg per day. It accumulates and persists in the amniotic fluid. Metabolism and excretion
A small proportion is converted to penicilloic acid. About 34% of an oral dose and 60–80% of parenteral doses are recoverable from the urine, where concentrations around 250–1000 mg/L appear. Excretion is partly in the glomerular filtrate and partly by tubular secretion, which can be blocked by probenecid. Impairment of renal function reduces the rate of excretion, the plasma half-life rising to 8–9 h in anuric patients.
Although excretion is mainly renal, up to 50 times the corresponding serum level may be attained in the bile. There is a degree of enterohepatic recirculation and significant quantities appear in the feces. Bioavailability may be affected in severe liver disease.

Clinical Use

Ampicillin, 6-[D-α-aminophenylacetamido]penicillanic acid,D-α-aminobenzylpenicillin (Penbritn, Polycillin, Omnipen,Amcill, Principen), meets another goal of the research onsemisynthetic penicillins—an antibacterial spectrum broaderthan that of penicillin G. This product is active against thesame Gram-positive organisms that are susceptible to otherpenicillins, and it is more active against some Gram-negativebacteria and enterococci than are other penicillins.Obviously, the α-amino group plays an important role in thebroader activity, but the mechanism for its action isunknown. It has been suggested that the amino group confersan ability to cross cell wall barriers that are impenetrableto other penicillins. D-(-)-Ampicillin, prepared from D-(-)-α-aminophenylacetic acid, is significantly more active thanL-(+)-ampicillin.
Ampicillin is water soluble and stable in acid. Theprotonated α-amino group of ampicillin has a pKa of 7.3,46and thus it is protonated extensively in acidic media, whichexplains ampicillin’s stability to acid hydrolysis and instabilityto alkaline hydrolysis. It is administered orally andis absorbed from the intestinal tract to produce peak plasmaconcentrations in about 2 hours. Oral doses must be repeatedabout every 6 hours because it is excreted rapidly andunchanged through the kidneys. It is available as a white, crystalline, anhydrous powder that is sparingly soluble inwater or as the colorless or slightly buff-colored crystallinetrihydrate that is soluble in water. Either form may be usedfor oral administration, in capsules or as a suspension.Earlier claims of higher plasma levels for the anhydrousform than for the trihydrate following oral administrationhave been disputed. The white, crystalline sodium salt isvery soluble in water, and solutions for injections should beadministered within 1 hour after being made.

Clinical Use

Isolates should be tested for susceptibility before use, especially for serious infections. For oral therapy, amoxicillin is preferable to ampicillin.
Urinary tract infections
Bacterial meningitis
Respiratory tract infections
Gastrointestinal infections, including typhoid fever and bacillary dysentery Enterococcal endocarditis and septicemia (in combination with an aminoglycoside)
Listeriosis (in combination with an aminoglycoside)

Side effects

Ampicillin is generally free from severe toxicity and, apart from gastrointestinal intolerance, the only significant side effects seen have been rashes. In common with other semisynthetic penicillins, it appears to be less likely than benzylpenicillin to elicit true allergic reactions. However, it is more likely to cause rashes, which are found in approximately 9% of treated patients and which occur more frequently in patients receiving large doses or in renal failure. Rashes occur in 95% of patients with infectious mononucleosis or other lymphoid disorders. This unusual susceptibility disappears when the disease resolves. In keeping with a toxic rather than an allergic origin, skin tests to ampicillin and to mixed-allergen moieties of benzylpenicillin are negative. Since the typical maculopapular rash of ampicillin does not have an allergic origin, its development does not indicate penicillin allergy and is not a contraindication to the use of other penicillins.
Gastrointestinal side effects are relatively common (around 10%) in patients treated with oral ampicillin, and occur in 2–3% of patients given the drug parenterally, presumably as a result of drug entering the gut through the bile. The very young and the old are most likely to suffer. Diarrhea can be sufficiently severe to require withdrawal of treatment and pseudomembranous colitis may occur. Interference with the bowel flora, which is presumably implicated in diarrhea, can also affect enterohepatic recirculation of steroids, and the derangement can be sufficient to impair the absorption of oral contraceptives and affect the interpretation of estriol levels.

Safety Profile

Mildly toxic by ingestion. An experimental teratogen. Other experimental reproductive effects. When heated to decomposition it emits toxic fumes of SO,xand NOx.

Potential Exposure

Used as an antibiotic.

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit.


UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.


May be incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides.

Waste Disposal

It is inappropriate and possibly dangerous to the environment to dispose of expired or waste pharmaceuticals by flushing them down the toilet or discarding them to the trash. Household quantities of expired or waste pharmaceuticals may be mixed with wet cat litter or coffee grounds, double-bagged in plastic, discard in trash. Larger quantities shall carefully take into consideration applicable DEA, EPA, and FDA regulations. If possible return the pharmaceutical to the manufacturer for proper disposal being careful to properly label and securely package the material. Alternatively, the waste pharmaceutical shall be labeled, securely packaged and transported by a state licensed medical waste contractor to dispose by burial in a licensed hazardous or toxic waste landfill or incinerator.

Ampicillin Preparation Products And Raw materials

Raw materials

Preparation Products

Ampicillin Suppliers

Global( 191)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20680 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32457 55
Xiamen AmoyChem Co., Ltd
+86 (0)592-605 1114 CHINA 6374 58
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 24001 58
Dalian Meilun Biotech Co., Ltd. 0411-66771943;0411-66771942
0411-66771945 China 4097 58
Yueyang Tianqing Biological Technology Co., Ltd. 15173087635 CHINA 35 58
J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
+86-10-82849933; China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
+86-(0)21-61259102(Shanghai) +86-(0)755-86170066(ShenZhen) +86-(0)10-88580358(Beijing) China 40277 62
TCI (Shanghai) Development Co., Ltd. 021-67121386 / 800-988-0390
021-67121385 China 24560 81
Energy Chemical 021-58432009 / 400-005-6266
021-58436166-800 China 44046 61

Ampicillin Spectrum

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