- Bacterial Infections 101 Pictures Slideshow
- Take the Tummy Trouble Quiz
- Hepatitis C Slideshow Pictures
- What is amoxicillin? How does it work (mechanism of action)?
- Why are the uses for amoxicillin (what does it treat)?
- What are amoxicillin side effects?
- What is the dosage for amoxicillin?
- Which drugs or supplements interact with amoxicillin?
- Is amoxicillin safe to take if I am pregnant or breastfeeding?
- What else should I know about amoxicillin?
What is amoxicillin? How does it work (mechanism of action)?
- ampicillin (Unasyn),
- piperacillin (Pipracil),
- ticarcillin (Ticar), and
- several others.
These antibiotics all have a similar mechanism of action. They do not directly kill bacteria, but they stop bacteria from multiplying by preventing bacteria from forming the walls that surround them. The walls are necessary to protect bacteria from their environment and to keep the contents of the bacterial cell together. Bacteria cannot survive without a cell wall. Amoxicillin is effective against many different bacteria including H. influenzae, N. gonorrhoea, E. coli, Pneumococci, Streptococci, and certain strains of Staphylococci.
The FDA approved Amoxicillin in December 1974.
Why are the uses for amoxicillin (what does it treat)?
- Amoxicillin is used to treat infections due to bacteria that are susceptible to the effects of amoxicillin.
- Common bacterial infections that amoxicillin is used for include infections of the
- It also is used to treat gonorrhea.
What are amoxicillin side effects?
Side effects due to amoxicillin include:
- abdominal pain,
- easy bruising,
- rash, and
- allergic reactions.
People who are allergic to the cephalosporin class of antibiotics, which are related to the penicillins, for example, cefaclor (Ceclor), cephalexin (Keflex), and cefprozil (Cefzil), may or may not be allergic to penicillins.
Serious but rare reactions include:
- severe allergic reactions (anaphylaxis), and
- low platelet (thrombocytopenia) or red blood cell count.
Amoxicillin can alter the normal bacteria in the colon and encourage overgrowth of some bacteria such as Clostridium difficile which causes inflammation of the colon (pseudomembranous colitis). Patients who develop signs of pseudomembranous colitis after starting amoxicillin (diarrhea, fever, abdominal pain, and possibly shock) should contact their physician immediately.
What is the dosage for amoxicillin?
- For most infections in adults the dose of amoxicillin is 250 mg every 8 hours, 500 mg every 8 hours, 500 mg every 12 hours or 875 mg every 12 hours, depending on the type and severity of infection.
- For the treatment of adults with gonorrhea, the dose is 3 g given as one dose.
- For most infections, children older than 3 months but less than 40 kg are treated with 25 or 45 mg/kg/day in divided doses every 12 hours or 20 or 40 mg/kg/day with one-third of the daily dose given every 8 hours depending on the type and severity of the infection.
- Amoxicillin can be taken with or without food.
Which drugs or supplements interact with amoxicillin?
Amoxicillin is rarely associated with important drug interactions.
Quick GuideSymptoms of Mono: Infectious Mononucleosis Treatment
Is amoxicillin safe to take if I am pregnant or breastfeeding?
- Penicillins are generally considered safe for use by pregnant women who are not allergic to penicillin.
- Small amounts of amoxicillin may be excreted in breast milk and may cause diarrhea or allergic responses in nursing infants. Amoxicillin is generally considered safe to use while breastfeeding. Amoxicillin is used to treat infections in the newborn.
What else should I know about amoxicillin?
- Capsules: 250 and 500 mg.
- Tablets: 500 and 875 mg.
- Chewable tablets: 125, 200, 250, and 400 mg.
- Powder for suspension: 50 mg/ml ; 125, 200, 250, and 400 mg/5 ml.
- Tablet (Extended release): 775 mg
- Amoxicillin capsules as well as the 125 and 250 mg dry powders should b e stored at or below 20 C (68 F).
- Chewable tablets as well as 200 and 400 mg dry powders should be stored at or below 25 C(77 F).
- Trimox capsules and unreconstituted powder should be stored at or below 20 C (68 F), and chewable tablets should be stored at room temperature 15 C to 30 C (59 F to 86 F).
- Powder that has been mixed with water should be discarded after 14 days. Refrigeration is preferred but not required for powder mixed with water.
Other information about amoxicillin
- Amoxicillin is available in generic form and is available by prescription only.
- Brand names available in the US for amoxicillin are Amoxil, Moxatag, and Larotid.
Infectious Disease Resources
Amoxicillin (Amoxil, Moxatag, Larotid) is an antibiotic that belongs to a class of antibiotics called penicillins. Common infections that amoxicillin is used to treat include middle ear infections, tonsillitis, laryngitis, bronchitis, pneumonia, skin, gonorrhea, and urinary tract infections.
Common side effects of amoxicillin include nausea, itching, vomiting, confusion, abdominal pain, and easy bruising.
Drug interactions, dosing, storage, and pregnancy and breastfeeding safety should be reviewed prior to taking penicillins.
Dispermox, Trimox, Wymox, Utimox, and Polymox are discontinued brands and are no longer available in the US.
Multimedia: Slideshows, Images & Quizzes
Rosacea Quiz: Test Your Medical IQ
Think acne and rosacea are the same? Think again. Take the Rosacea Quiz to learn all about this inflammatory skin condition....
Skin Quiz: Acne, Dry Skin, Dandruff & More
What's that all over you? Skin, of course! Test your knowledge of your most amazing organ with the Skin Quiz!...
Acne (Pimples) Quiz: Test Your Medical IQ
Acne is the most common skin disorder in the world. If you suffer from acne, you are not alone and many treatment options are...
Ear Infection Quiz: Test Your Medical IQ
Is it possible to prevent ear infections? Take the Ear Infection (Otitis Media) Quiz to learn the risks, causes, symptoms and...
Do I Have Pneumonia? Symptoms & Signs
Pneumonia can be deadly. Take the Pneumonia Quiz on MedicineNet to learn more about this highly contagious, infectious disease....
Strep (Streptococcal) Throat Infection Quiz: Test Your Infectious Disease IQ
Take the Strep (Streptococcal) Throat Infection Quiz to learn about causes, symptoms, treatments, prevention methods, diagnosis,...
STD Quiz: Symptoms, Testing & List
There are more sexually transmitted diseases than just the ones you've heard of. Find out what you've been missing with the STD...
Urinary Tract Infection Quiz
How would you know if you had urinary tract infection (UTI)? Take the Urinary Tract Infection in Adult Quiz to learn the causes,...
Picture of Infectious Mononucleosis
"Mono" and "kissing disease" are popular terms for this very common illness caused by the Epstein-Barr virus (EBV). See a picture...
Picture of Infectious Mononucleosis
A specific viral infection (with the Epstein-Barr virus) in which there is an increase of white blood cells that are mononuclear...
Picture of The Clap (Gonorrhea)
A sexually transmitted infection (STI) caused by the bacterium Neisseria gonorrhoea. See a picture of The Clap (Gonorrhea) and...
Picture of Acne Vulgaris Nodulocystic
Inflammatory nodules, cysts, and pustules (left). See a picture of Acne Vulgaris Nodulocystic and learn more about the health...
Picture of Cystic Acne
Cystic acne is a type of abscess that is formed when oil ducts become clogged and infected. See a picture of Cystic Acne and...
Picture of Strep Throat
Strep infection often produces a distinct pattern of white patches in the throat and on the tonsils, as well as red swollen...
Picture of Fixed Drug Eruption
A large red-violet plaque on the arm of a child. See a picture of Fixed Drug Eruption and learn more about the health topic....
Picture of Acne
Exactly what causes acne? Acne develops when cells and natural oils begin to block up tiny hair follicles in the skin. See a...
Picture of Sinuses
The sinuses are an air-filled cavity in a dense portion of a skull bone. See a picture of the Sinuses and learn more about the...
Rosacea, Acne, Shingles: Common Adult Skin Diseases
Learn to spot and treat skin conditions commonly found in adults such as acne, eczema, shingles, psoriasis, rosacea, hives, cold...
Lyme Disease Symptoms, Rash, Treatments
Lyme disease is caused by the bacterium Borrelia burgdorferi transmitted to humans through infected deer ticks. Lyme disease...
Urinary Tract Infection (UTI) Symptoms, Diagnosis, Medication
Understand urinary tract infection (UTI) through pictures. Our experts describe urinary tract infection symptoms like pelvic...
Sore Throat or Strep Throat? How to Tell the Difference
Explore the types and causes of a sore throat through pictures, including strep throat, and learn how to find relief from that...
Ear Infection Symptoms, Causes, and Treatment
Learn about the causes and symptoms of ear infections and how they are diagnosed and treated. Read about treatments such as ear...
Symptoms of Mono: Infectious Mononucleosis Treatment
What is mononucleosis (mono)? Learn about mononucleosis (mono) symptoms, treatment, and diagnosis. Discover how mononucleosis...
Sinus Infection (Sinusitis) Symptoms & Treatment
Sinus infection (sinusitis) symptoms can include headaches, a sore throat, and toothaches. Chronic sinusitis may be caused by...
Skin Health: 15 Tips for Clear Skin
Acne, pimples, zits and blemishes often appear on the face, back, chest, neck, and shoulders where skin has the most amount of...
STD Diagnosis, Images, Symptoms, Treatment
Learn about sexually transmitted diseases (STDs) including symptoms, signs, diagnosis, and treatment options. Get more...
What Is a Staph Infection? Symptoms, Pictures
Do you know what a staph infection is? Learn about the causes, symptoms, and treatment of staph infections (Staphylococcus...
Bladder Infections: UTI Causes, Symptoms, Treatments
Urinary tract infections (UTI), including bladder infections, affect women and men, causing UTI symptoms like kidney infection....
How to Get Rid of Acne: Skin Care Tips
Want to know how to get rid of blackheads? Discover tips on clogged pores, sunscreen SPF and how to remove makeup for different...
Adult Acne (Pimples) Causes and Treatments
Acne (pimples) is a skin condition that blocks pores. Get answers on causes, solutions and treatments for this skin condition...
Acne Care Pictures: Skin Care Dos and Don'ts
Explore quick acne cover-ups, dos and don'ts. See solutions on how to best handle pesky pimples and remedies to avoid....
Bacterial Infections 101: Types, Symptoms, and Treatments
Learn more about bacteria and the most common bacterial infections. Get more information on bacterial skin infections, which...
Acne 101: Types, Best Treatments, Medication, Cystic Acne
What is the best treatment for acne vulgaris? Can food choices influence acne? How can you get rid of blackheads? Learn why it's...
Common Respiratory Illnesses
Is your cough caused by a cold, flu, pneumonia or something else? Learn causes of respiratory infection like bronchitis,...
Related Disease Conditions
Group A Streptococcal Infections
Second Source article from Government...
Acne is a localized skin inflammation as a result of overactivity of oil glands at the base of hair follicles. This...
Tonsillitis (Adnoiditis, Symptoms, Home Treatment, Pictures, Causes)
Tonsillitis is a contagious infection with symptoms of bad breath, snoring, congestion, headache, hoarseness, laryngitis,...
Aortic Valve Stenosis (Symptoms, Causes, Surgery)
Aortic valve stenosis is an abnormal narrowing of the aortic valve of the heart. The causes of aortic stenosis are wear and tear...
Clostridium Difficile Colitis (Antibiotic-Associated Colitis, C. difficile colitis)
Clostridium difficile (C. difficile) is a bacterium, and is one of the most common causes of infection of the colon. C. difficile...
H. pylori (Helicobacter Pylori ) Infection Symptoms, Test, Treatment
Helicobacter pylori (H. pylori) is a bacteria that causes chronic inflammation (gastritis) of the inner lining of the stomach,...
Leptospirosis is an infectious disease that causes symptoms such as fever, headache, and chills. Treatment for leptospirosis...
Lyme disease is a bacterial illness, which is spread by ticks when they bite the skin. Initially the disease affects the skin...
Infectious mononucleosis is a virus infection in which there is an increase of white blood cells that are mononuclear (with a...
Mitral Valve Prolapse (Syndrome, Symptoms, Causes, Treatment, Surgery)
Mitral valve prolapse (MVP), also called "click murmur syndrome" and "Barlow's syndrome," is the most common type of heart valve...
Peptic Ulcer (Stomach Ulcer)
Peptic or stomach ulcers are ulcers are an ulcer in the lining of the stomach, duodenum, or esophagus. Ulcer formation is related...
Pneumonia is inflammation of the lungs caused by fungi, bacteria, or viruses. Symptoms and signs include cough, fever, shortness...
Rosacea is a skin disease that causes redness of the forehead, chin, and lower half of the nose. In addition to inflammation of...
Sinus Infection (Sinusitis)
Sinus infection (sinusitis) is caused by allergies, infection, and chemicals or other irritants of sinuses. Signs and symptoms...
Sore throat (throat pain) usually is described as pain or discomfort in the throat area. A sore throat may be caused...
Sexually Transmitted Diseases in Women (STD)
Sexually transmitted diseases (STDs) are among the most common infectious diseases in the United States. STDs can be spread...
Strep Throat (Treatment, Causes, Home Remedies)
Strep throat is a bacterial infection of the throat. Signs and symptoms of strep throat include headache, nausea, vomiting, sore...
Urinary Tract Infections (UTIs)
A urinary tract infection (UTI) is an infection of the bladder, kidneys, ureters, or urethra. E. coli, a type of bacteria that...
Endocarditis, a serious infection of one of the four heart valves is caused by growth of bacteria on one of the heart valves;...
Staph Infection (Staphylococcus Aureus)
Staphylococcus or staph is a group of bacteria that can cause a multitude of diseases. Staph infections can cause illness...
Ear Infection (Otitis Media)
Middle ear infection or inflammation (otitis media) is inflammation of the middle ear. There are two forms of this type of ear...
Gonorrhea In Women
Gonorrhea is a bacterial infection transmitted during sexual contact. In women, symptoms include a yellow vaginal discharge,...
Pregnancy and Drugs (Prescription and OTC)
Taking prescription medications or over-the-counter drugs or supplements should be discussed with your doctor. There are some...
Heart Attack Prevention
Heart disease and heart attacks can be prevented by leading a healthy lifestyle with diet, exercise, and stress management....
STDs in Men
Sexually transmitted diseases (STDs) are infections transmitted during sexual contact. They may be caused by viruses, bacteria,...
Pericoronitis is inflammation of the gum tissue around the molars. Pericoronitis commonly occurs in teens or young people when...
Bronchitis (Acute) Contagoius Symptoms, Causes, Treatment, and Recovery Time
Bronchitis is inflammation of the airways in the lung. Acute bronchitis is is short in duration (10 to 20 days) in comparison...
Group A streptococcal infections are caused by group A streptococcus, a bacteria that causes a variety of health problems,...
Vancomycin-Resistant Enterococci (VRE)
Vancomycin-resistant enterococci (VRE) infection is the most common type of infection acquired by patients while hospitalized....
Gastritis Symptoms, Causes, Diet, Home Remedies, Treatment, and Cure
Gastritis (acute and chronic) is an inflammation of the lining of the stomach Some people have no gastritis symptoms, but when...
Bug Bites and Stings
Bug bites and stings have been known to transmit insect-borne illnesses such as West Nile virus, Rocky Mountain spotted fever,...
Scarlet Fever (Scarlatina)
Scarlet fever, a bacterial infection caused by group A Streptococcus bacteria, causes symptoms and signs such as fever, rash with...
PANDAS (Pediatric Autoimmune Neuropsychiatric Disorders Associated With Streptococcal Infections)
PANDAS is in part caused by an autoimmune response to a strep infection. Symptoms mimic those of OCD, ADHD, and include motor and...
Is H. pylori Contagious? Symptoms and Tests
H. pylori (Helicobacter pylori) infection: Is it contagious? H. pylori infection is caused by fecal contamination in either food...
Is Chlamydia Contagious? (Symptoms and Transmission)
Chlamydia is a sexually tranmistted disease (STD) that is contagious. Chlaymida is spread through sexual contact (You cannot get...
Is Mononucleosis (Mono) Contagious?
Mononucleosis (mono) is caused by the Epstein-Barr virus and can be transmitted by an infected person's saliva. Mono symptoms and...
Treatment & Diagnosis
- Sore Throat (Pharyngitis)
- Doctor: Checklist to Take To Your Doctor's Appointment
- Cloudy Urine
- Urine Odor
- Urinary Tract Infection (UTI)
- Bladder Infection
- Lyme Disease
- Sinus Infection (Sinusitis)
- Scarlet Fever
- Middle Ear Infection (Otitis Media)
- Acute Sinusitis
- Helicobacter pylori (H. pylori) Infection
- Gum Disease
- Urinary Tract Infection FAQs
- STD FAQs
- Skin FAQs
- Pneumonia FAQs
- Acne FAQs
- Rosacea FAQs
- Strep Streptococcal Throat Infection FAQs
- Ear Infection FAQs
- Medication Disposal
- Dangers of Mixing Medications
- Tonsils and Adenoids, Parent's Perspective
- How To Reduce Your Medication Costs
- Pharmacy Visit, How To Get The Most Out of Your Visit
- Indications for Drugs: Approved vs. Non-approved
- Drugs: Buying Prescription Drugs Online Safely
- Drugs: The Most Common Medication Errors
- Antibiotics 101
- Generic Drugs, Are They as Good as Brand-Names?
- Antibiotics 101 - Audio Podcast
Medications & Supplements
- probenecid, (Benemid - brand no longer available)
- penicillin V, (Veetids and Pen-Vee-K have been discontinued)
- Drugs: Questions to Ask Your Doctor or Pharmacist about Your Drugs
- Drug Interactions
- Penicillin (Antibiotics)
- Amoxicillin vs. Levaquin (Strength and Effectiveness)
- Amoxicillin vs. Augmentin (Comparison of Side Effects and Antibiotic Uses)
Prevention & Wellness
- Antibiotic Resistance Common in Kids' Urinary Tract Infections
- Strep Throat: How Soon Can Kids Go Back to School?
- Prescription Meds: Too Common in Pregnancy?
- Simpler Antibiotic Regimen Helps Sick Babies in Developing Nations
- Certain Heart Drug, Antibiotic Combo Might Be Fatal for Seniors
- Study Finds Many Flu Patients Not Treated Appropriately
- New Push by Doctors to Limit Antibiotic Use in Kids
- Many Docs Wrongly Prescribe Powerful Antibiotics: Study
- Pediatrics Group Issues New Ear Infection Guidelines
- Deer Ticks Carry Yet Another Bacterial Threat
- Most Coughs Don't Respond to Antibiotics, Study Confirms
- Kids' Strep Throat: Likely No Need to Lose Tonsils
- New Strep Throat Guidelines Tackle Antibiotic Resistance
- Prescription Drugs for Kids: What's Up, Down
- Z-Pak Heart Attack?
- Germs Behind Urinary Tract Infections Becoming More Resistant to Drugs
- Antibiotics Do Not Reduce Symptoms of Sinus Infection
- The 10 Most Prescribed Drugs
- Ear Infections: Antibiotics Often Not Needed
Health Solutions From Our Sponsors
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.