- 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.
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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.
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.
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Related Disease Conditions
Sinus Infection (Sinusitis)
Sinus infection (sinusitis) is caused by allergies, infection, and chemicals or other irritants of sinuses. Signs and symptoms are headache, fever, and facial tenderness, pressure, or pain. Treatments of sinus infections are generally with antibiotics and at times, home remedies.
STDs in Men
Sexually transmitted diseases (STDs) are infections transmitted during sexual contact. They may be caused by viruses, bacteria, or parasites. STDs in men cause no symptoms or symptoms like genital burning, itching, sores, rashes, or discharge. Common infections that are sexually transmitted in men include gonorrhea, chlamydia, syphilis, hepatitis C and B, genital warts, human papillomavirus (HPV), and genital herpes. Some STDs in men are treatable while others are not. STDs are diagnosed with tests that identify proteins or genetic material of the organisms causing the infection. The prognosis of an STD depends on whether the infection is treatable or not. Use of latex condoms can help reduce the risk of contracting an STD but it does not eliminate the risk entirely.
Staph Infection (Staphylococcus Aureus)
Staphylococcus or staph is a group of bacteria that can cause a multitude of diseases. Staph infections can cause illness directly by infection or indirectly by the toxins they produce. Symptoms and signs of a staph infection include redness, swelling, pain, and drainage of pus. Minor skin infections are treated with an antibiotic ointment, while more serious infections are treated with intravenous antibiotics.
Acne is a localized skin inflammation as a result of overactivity of oil glands at the base of hair follicles. This inflammation, depending on its location, can take the form of a superficial pustule (contains pus), a pimple, a deeper cyst, congested pores, whiteheads, or blackheads. Treatments vary depending on the severity of the acne.
Urinary Tract Infection (UTI)
A urinary tract infection (UTI) is an infection of the bladder, kidneys, ureters, or urethra. E. coli, a type of bacteria that lives in the bowel and near the anus, causes most UTIs. UTI symptoms include pain, abdominal pain, mild fever, urinary urgency and frequency. Treatment involves a course of antibiotics.
Sore throat (throat pain) usually is described as pain or discomfort in the throat area. A sore throat may be caused by bacterial infections, viral infections, toxins, irritants, trauma, or injury to the throat area. Common symptoms of a sore throat include a fever, cough, runny nose, hoarseness, earaches, sneezing, and body aches. Home remedies for a sore throat include warm soothing liquids and throat lozenges. OTC remedies for a sore throat include OTC pain relievers such as ibuprofen or acetaminophen. Antibiotics may be necessary for some cases of sore throat.
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 they do occur they may include bloating, belching, loss of appetite, nausea, and vomiting. H. pylori infection and nonsteroidal anti-inflammatory drugs (NSAIDs) are the two main causes of gastritis. Alcohol, caffeine, and high-fat foods also can cause gastritis. Fried, fatty, and spicy foods, and alcohol aggravate gastritis symptoms. Other stomach lining irritants that aggravate symptoms include cigarette smoking, acidic juices, caffeine, tomato products, peppers, and chili powder. Foods that sooth gastritis symptoms, and that help reduce and stop H. pylori infection growth in the stomach include apples, onions, garlic, teas, green leafy vegetables, coconut water, and wheat bran. Gastritis is diagnosed with endoscopy, blood tests, or stool tests. Some people get relief from gastritis symptoms with prescription and non-prescription antacids, histamine blockers like famotidine (Pepcid AC) or ranitidine (Zantac 75), or proton pump inhibitors (PPIs) like omeprazole (Prilosec) and esomeprazole (Nexium). These drugs will not cure gastritis. Complications of gastritis include gastric cancers, MALT lymphoma, renal problems, and death.
Pneumonia is inflammation of the lungs caused by fungi, bacteria, or viruses. Symptoms and signs include cough, fever, shortness of breath, and chills. Antibiotics treat pneumonia, and the choice of the antibiotic depends upon the cause of the infection.
Pericoronitis is inflammation of the gum tissue around the molars. Pericoronitis commonly occurs in teens or young people when the wisdom teeth erupt. Symptoms include pain, swelling, swollen lymph nodes, and difficulty opening the mouth. Pericoronitis can be diagnosed by a dentist and is treated with pain medication. Severe cases may be treated with surgery.
Rosacea is a skin disease that causes redness of the forehead, chin, and lower half of the nose. In addition to inflammation of the facial skin, symptoms include dilation of the blood vessels and pimples (acne rosacea) in the middle third of the face. Oral and topical antibiotics are treatments for rosacea. If left untreated, rhinophyma (a disfiguring nose condition) may result.
Sexually Transmitted Diseases in Women (STDs)
Sexually transmitted diseases (STDs) are among the most common infectious diseases in the United States. STDs can be spread through any type of sexual activity involving the sex organs, the anus or mouth, or through contact with blood during sexual activity. Examples of STDs include, chancroid, chlamydia, gonorrhea, granuloma inguinale, lymphogranuloma venereum, syphilis, genital herpes, genital warts, trichomoniasis, pubic lice (crabs), and scabies. Treatment is generally with antibiotics; however, some STDs that go untreated can lead to death.
Infectious mononucleosis is a virus infection in which there is an increase of white blood cells that are mononuclear (with a single nucleus) "Mono" and "kissing disease" are popular terms for this very common illness caused by the Epstein-Barr virus (EBV).
Middle Ear Infection (Otitis Media)
Middle ear infection (otitis media) is inflammation of the middle ear. There are two forms of this type of ear infection, acute and chronic. Acute otitis media is generally short in duration, and chronic otitis media generally lasts several weeks. Babies, toddlers, and children with a middle ear infection may be irritable, pull and tug at their ears, and experience numerous other symptoms and signs. Treatment depends upon the type of ear infection.
Tonsillitis and Adenoiditis
Tonsillitis is a contagious infection with symptoms of bad breath, snoring, congestion, headache, hoarseness, laryngitis, and coughing up blood. Tonsillitis can be caused acute infection of the tonsils, and several types of bacteria or viruses (for example, strep throat or mononucleosis). There are two types of tonsillitis, acute and chronic. Acute tonsillitis lasts from one to two weeks while chronic tonsillitis can last from months to years. Treatment of tonsillitis and adenoids include antibiotics, over-the-counter medications, and home remedies to relieve pain and inflammation, for example, salt water gargle, slippery elm throat lozenges, sipping warm beverages and eating frozen foods (ice cream, popsicles), serrapeptase, papain, and andrographism Some people with chronic tonsillitis may need surgery (tonsillectomy or adenoidectomy).
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 to H. pylori bacteria in the stomach, use of anti-inflammatory medications, and cigarette smoking. Symptoms of peptic or stomach ulcers include abdominal burning or hunger pain, indigestion, and abdominal discomfort after meals. Treatment for stomach ulcers depends upon the cause.
H. pylori (Helicobacter Pylori) Infection
Helicobacter pylori (H. pylori) is a bacteria that causes chronic inflammation (gastritis) of the inner lining of the stomach, and also is the most common cause of ulcers worldwide. About 50% of people in the world carries or is infected with H. pylori. Common symptoms of H. pylori infection are occasional abdominal discomfort, bloating, belching or burping, and nausea and vomiting. H. pylori infection is difficult to eradicate, and treatment is with two or more antibiotics.
PANDAS is in part caused by an autoimmune response to a strep infection. Symptoms mimic those of OCD, ADHD, and include motor and verbal tics. Treatment involves medication and cognitive behavioral therapy.
Gonorrhea In Women
Gonorrhea is a bacterial infection transmitted during sexual contact. In women, symptoms include a yellow vaginal discharge, burning or frequent urination, and redness, swelling, burning and itching of the vaginal area. Gonorrhea can be treated with injectable (penicillin) or oral medications.
Is Chlamydia Contagious?
Chlamydia is a sexually transmitted disease (STD) that is contagious. Chlaymida is spread through sexual contact. (You cannot get chlamyidia from kissing or sharing utensils or drinks.) Chlamydia is the most common STD in the U.S. The incubation period for chlamydia ranges from days to months, and the contagious period ends seven days after patients begin treatment. Chlamydia signs and symptoms may include painful urination, rectal irritation (proctitis), eye infections, and infertility. Women can also develop chronic pelvic pain, salpingitis, and endometritis.
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 throat, and fever. Strep throat symptoms in infants and children are different than in adults. Strep throat is contagious and is generally passed from person-to-person. Treatment for strep throat symptoms include home remedies and OTC medication; however, the only cure for strep throat are antibiotics.
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 or water, and by poor hygiene practices such as not washing the hands often. Common symptoms of H. pylori are a discomfort or pain in the area of the stomach. Some individuals describe the pain as gnawing or burning. Treatment of H. pylori infection is antibiotic therapy.
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 abnormality. Usually, people with mitral valve prolapse have no signs and symptoms; however, if the prolapsed valve is severe, symptoms may appear. When symptoms of severe mitral valve prolapse do appear, they may include, fatigue, palpitations, chest pain, anxiety, migraine headaches, and pulmonary edema. Echocardiography is the most useful test for mitral valve prolapse. Most people with mitral valve need no treatment. However, if the valve prolapse is severe, treatment medications or surgery may be necessary to repair the heart valve.
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 with chronic bronchitis, which lasts for months to years. Causes of acute bronchitis include viruses and bacteria, which means it can be contagious. Acute bronchitis caused by environmental factors such as pollution or cigarette smoke is not contagious. Common symptoms for acute bronchitis include nasal congestion, cough, headache, sore throat, muscle aches, and fatigue. Acute bronchitis in children also my include runny nose, fever, and chest pain. Treatment for acute bronchitis are OTC pain relievers, cough suppressants (although not recommended in children), and rest. Infrequently antibiotics may be prescribed to treat acute bronchitis.
Group A streptococcal infections are caused by group A streptococcus, a bacteria that causes a variety of health problems, including strep throat, impetigo, cellulitis, erysipelas, and scarlet fever. There are more than 10 million group A strep infections each year.
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 spores are found frequently in hospitals, nursing homes, extended care facilities, and nurseries for newborn infants. They can be found: on bedpans, furniture, toilet seats, linens, telephones, stethoscopes, fingernails, rings, floors, infants' rooms, and diaper pails. They even can be carried by pets. Antibiotic-associated (C. difficile) colitis is an infection of the colon caused by C. difficile that occurs primarily among individuals who have been using antibiotics. Treatment for C. difficile colitis includes: hydration, replenishment of electrolyte deficiencies, discontinuing the antibiotic that caused the colitis, and using antibiotics to eradicate the C. difficile bacterium.
Vancomycin-Resistant Enterococci (VRE)
Vancomycin-resistant enterococci (VRE) infection is the most common type of infection acquired by patients while hospitalized. Patients at risk for VRE are those who are already ill, and hospitalized, including individuals with diabetes, elderly, ICU patients, kidney failure patients, or patients requiring catheters. Enterococci can survive for months in the digestive tract and female genital tract. Other risk factors for acquiring VRE include those how have been previously treated with vancomycin and combinations of other antibiotics. Treatment of VRE is generally with other antibiotics other than vancomycin. Prevention of VRE can be achieved by proper hand hygiene.
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 of the valve in the elderly, congenital, or scarring or scarring of the aortic valve from rheumatic fever. Symptoms include angina, fainting, and shortness of breath. Treatment is dependant upon the severity of the condition.
Leptospirosis is an infectious disease that causes symptoms such as fever, headache, and chills. Treatment for leptospirosis requires antibiotics.
Scarlet Fever (Scarlatina)
Scarlet fever, a bacterial infection caused by group A Streptococcus bacteria, causes symptoms and signs such as fever, rash with a sandpaper-like texture, and sore throat. Oral penicillin is the standard treatment for scarlet fever, or scarlatina.
Group A Streptococcal Infections
Second Source article from Government
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 signs include rash, enlarged spleen, swollen lymph nodes, fever, sore throat, and fatigue.
Endocarditis, a serious infection of one of the four heart valves is caused by growth of bacteria on one of the heart valves; leading to an infected massed called a "vegetation." The infection can be caused by having bacteria in the bloodstream after dental work, colonoscopy, or other similar procedures. Endocarditis symptoms include: fever, fatigue, weakness, chills, aching muscles and joints, night sweats, edema in the legs, feet, or abdomen, malaise, shortness of breath and small skin lesions. Treatment for endocarditis is generally aggressive antibiotic treatment.
Lyme disease is a bacterial illness, which is spread by ticks when they bite the skin. Initially the disease affects the skin causing a reddish rash associated with flu-like symptoms. It takes weeks to months after the initial redness of the skin for its effects to spread throughout the body. Lyme disease can be treated with antibiotics. Lyme disease can be prevented by using tick avoidance techniques.
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, and Lyme disease. Though most reactions to insect bites and stings are mild, some reactions may be life-threatening. Preventing bug bites and stings with insect repellant, wearing the proper protective attire, and not wearing heavily scented perfumes when in grassy, wooded, and brushy areas is key.
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 medications that have been found to cause no problems in pregnancy, however, medications such as Accutane for acne, should never be taken during pregnancy.
Heart Attack Prevention
Heart disease and heart attacks can be prevented by leading a healthy lifestyle with diet, exercise, and stress management. Symptoms of heart attack in men and women include chest discomfort and pain in the shoulder, neck, jaw, stomach, or back. Women experience the same symptoms as men; however, they also may experience: Extreme fatigue Pain in the upper abdomen Dizziness Fainting Leading a healthy lifestyle with a heart healthy low-fat diet, and exercise can help prevent heart disease and heart attack.
Tonsil stones are small clusters of calcifications that form when food, dead cells, mucus, and bacteria get stuck in the nooks and crannies of the tonsils. Tonsil stones are hard, appear as white or yellowish formations on the tonsils, and usually smell bad due to bacteria. If symptoms occur, they may include persistent bad breath, sore throat, difficulty swallowing, ear pain, and cough.
Treatment & Diagnosis
- Urine Odor
- Cloudy Urine
- Bladder Infection
- Urinary Tract Infection (UTI)
- Sinus Infection (Sinusitis)
- Helicobacter pylori (H. pylori) Infection
- Middle Ear Infection (Otitis Media)
- Sore Throat (Pharyngitis)
- Lyme Disease
- Gum Disease
- Doctor: Checklist to Take To Your Doctor's Appointment
- Acute Sinusitis
- Scarlet Fever
- Aortic Stenosis
- 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
- Penicillin (Antibiotics)
- Amoxicillin vs. Levaquin (Strength and Effectiveness)
- Amoxicillin vs. Augmentin (Comparison of Side Effects and Antibiotic Uses)
- Drugs: Questions to Ask Your Doctor or Pharmacist about Your Drugs
- Amoxicillin (Amoxil) vs. Doxycycline (Vibramycin)
- Drug Interactions
- Amoxicillin vs. Ampicillin
- Amoxicillin (Moxatag) vs. Azithromycin (Zithromax)
- Amoxicillin vs. Cipro
- Amoxicillin vs. Penicillin
- Amoxicillin vs. Ceftin
- Nitrofurantoin vs. Amoxicillin
- penicillin V
- probenecid, (Benemid - brand no longer available)
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
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