Amoxicillin
Also called amoxil, Amoxi-Tabs, Larotid and Robamox.
A penicillin antibiotic used for ear, chest, throat and dental infections. One extra hydroxyl group over ampicillin lets far more of it reach the blood when swallowed.
Sources and notes
- The introductionfrom sourceMoleculeFinder curated
- Other namesfrom sourceWikidataIts English label and aliases on Wikidata.
- Formula and weightcomputedPubChem
- 2D drawingcomputedPubChem structure, drawn by RDKit
- 3D modelfrom sourcePubChem 3D conformerLoaded after the page has painted, and on a phone only when you ask for it; the 2D drawing shows until it arrives.
Where you encounter it
Dispensed on prescription, not sold on a shelf. Amoxicillin on the product labels we hold.
Medicines
Every product and list we hold
Sources and notes
- The product labels and their strengthsfrom sourceDailyMed (FDA label)Each label lists the molecule as an ingredient, and an active ingredient at the strength shown.
- How it gets therefrom sourceMoleculeFinder curatedEach mark is set by hand on our lists, never inferred; a label's ingredient is added by the maker. A row with no mark data says Not marked.
- The line abovefrom sourceMoleculeFinder curatedFrom the group the molecule belongs to.
Explore its structure
Choose a part to light it up.
A carbon carrying both a C=O and an O-H, written COOH. In water it gives up that hydrogen, which is what makes the molecule an acid.
From: standard chemistry.
A C=O bonded to a nitrogen, the same link that joins amino acids in a protein. It is sturdy, and its nitrogen is not a base the way an amine's is.
From: standard chemistry.
An O-H fixed directly to a benzene ring. The ring makes that hydrogen easier to give up than an ordinary alcohol's, which is why many phenols act as antioxidants.
From: standard chemistry.
Sources and notes
- The drawingcomputedPubChem structure, drawn by RDKitThe page's one shipped drawing, with the chosen part lit in amber under it.
- The partscomputedFound by ruleEach part is found by a chemical pattern, never picked by hand atom by atom; its words say where they come from.
Compare a related molecule
Amoxicillin
Azithromycin
Amoxicillin is a penicillin that blocks bacterial cell wall building, while azithromycin is a macrolide that stops protein synthesis and lingers for days.
Amoxicillin vs Azithromycin, side by sideSources and notes
- The sentencefrom sourceMoleculeFinder comparison notesThe pair's answer line.
- The two drawingscomputedPubChem structures, drawn by RDKitThe two drawings side by side.
Properties and sources
Calculated by PubChem
- Molecular formula
- C16H19N3O5S
- Molecular weight
- 365.4 g/mol
- XLogP3octanol/water, log units
- −2
- Polar surface areatopological
- 158 Ų
- H-bond donors
- 4
- H-bond acceptors
- 7
- Rotatable bonds
- 4
- Complexity
- 590
Reported Hazard label (GHS), ECHA, HSDB via PubChem
Danger Irritant pictogram (GHS07) and Health hazard pictogram (GHS08); hazard statements H317, H334
Reported Licence
The US Food and Drug Administration licenses Amoxicillin for human use (NDA 050760, authorized April 15, 1999). Drugs@FDA
Groups it belongs to
- Category
- Prescription medicine
- Family
- Antibiotics
- Chemical groups
- Carboxylic Acids, Amines, Aromatics, Amides, Phenols
- Hazard classes
- Irritant, Health hazard, GHS Danger
CC1([C@@H](N2[C@H](S1)[C@@H](C2=O)NC(=O)[C@@H](C3=CC=C(C=C3)O)N)C(=O)O)CPubChem CID 33613 · Wikidata Q201928 · InChIKey LSQZJLSUYDQPKJ-NJBDSQKTSA-N · Data refreshed
Questions
- What is Amoxicillin?
- A penicillin antibiotic used for ear, chest, throat and dental infections. One extra hydroxyl group over ampicillin lets far more of it reach the blood when swallowed.
- How toxic is Amoxicillin?
- Its GHS hazard label carries the signal word Danger and the hazard pictograms Irritant and Health hazard. from source
- What kind of molecule is Amoxicillin?
- Amoxicillin has the formula C16H19N3O5S and a molecular weight of 365.4 g/mol. MoleculeFinder files it under antibiotics, in the prescription medicine group. from sourcefrom sourcefrom sourcefrom source
- What else is Amoxicillin called?
- Amoxicillin is also called amoxil, Amoxi-Tabs, Larotid and Robamox. from source
- Who licenses Amoxicillin as a medicine?
- The US Food and Drug Administration licenses Amoxicillin for human use (NDA 050760, authorized April 15, 1999). from source
Sources and notes
- Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
- Hazard labelfrom sourceECHA, HSDB via PubChemThe label combines these classifications.
- ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
- Licencefrom sourceDrugs@FDARead 2026-10-21.
- Data refreshedfrom sourceMoleculeFinder2026-11-09
Keep exploring
Sources and notes
- Compared side by sidefrom sourceMoleculeFinder comparison notesA molecule we compare it with on its own page.
- The same kind of moleculefrom sourceMoleculeFinder curated groupsA structural neighbour in the same family or type group; the line names the group in its own words.
- The drawingscomputedPubChem structures, drawn by RDKit