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Generic Name: Amoxicillin
Brands: Amoxil, Moxatag, and Larotid
Class: Penicillin-like antibiotics
Availability: Prescription needed
Molecular Formula: C16H19N3O5S
Substance UNII: 804826J2HU

What is Amoxicillin? 

Amoxicillin is an antibiotic. It is often sold under the brand names Amoxil, Moxatag, and Larotid.

What is Amoxicillin Used For? 

Amoxicillin is used to treat bacterial infections, such as pneumonia, tonsillitis, bronchitis, and other infections of the lungs, ears, and urinary tract. It does not work for viral infections like the common cold or flu.

How Does Amoxicillin Work? 

Amoxicillin works by killing bacteria in the body via stopping bacteria from making a cell wall and stopping further growth. 

How Long Does it Take for Amoxicillin to Work? 

Like other antibiotics, amoxicillin can take a few days to begin working. 

Do Not Use Amoxicillin If: 

There are several situations where this medication may not be the right choice for you. According to the U.S. National Library of Medicine, the following should not use amoxicillin: 

  • Allergic to penicillin
  • Have had kidney disease
  • Currently have mono (infectious mononucleosis)
  • Talk to your doctor if you are pregnant 
  • Anyone who has phenylketonuria, or PKU (a buildup of phenylalanine, an amino acid)

Please note that this list may not be complete, and there may be other situations where amoxicillin use is not advisable. 

Disclaimer: this article does not constitute or replace medical advice. If you have an emergency or a serious medical question, please contact a medical professional or call 911 immediately. To see our full medical disclaimer, visit our Terms of Use page.

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