All medications have side effects, including antibiotics. Antibiotics are medications that treat infections by killing bacteria or other organisms or slowing their growth. An antibiotic side effect occurs as an unwanted reaction that occurs in addition to the desirable therapeutic action of the antibiotic you are taking. Show
Side effects of antibiotics can range from mild allergic reactions to severe and debilitating adverse events. When used appropriately, most antibiotics are relatively safe with few side effects. However, some side effects may interfere with your ability to finish the medication. In these cases, you should contact your doctor. Common side effects with antibiotics include:
More severe antibiotic side effects include:
These side effects are extremely variable; however, there are some common side effects that may occur within larger antibiotic drug classes, as described in . Long term side effects of antibiotics can occur, but are infrequent. Should I Stop My Antibiotic If I'm Having a Side Effect?If you are experiencing a bothersome or serious antibiotic side effect, you should contact your health care provider to discuss your symptoms. The outcomes may include:
In most cases, all antibiotic treatment should be finished unless your healthcare prover tells you otherwise. Stopping antibiotics early may allow the infection to worsen and may lead to antibiotic resistance, making the antibiotic less effective. Even if the infection appears to have cleared up before all of the medication is gone, finish your treatment unless your doctor tells you to stop. Antibiotic AllergiesAntibiotic allergies or hypersensitivity reactions are some of the most common side effects of antibiotics leading to emergency room admission.1 Always tell your doctor of any previous allergic reaction to any medication, including antibiotics. Mild allergic reactions may only result in a skin rash or itch. A more severe allergic reaction, called anaphylaxis, is a life-threatening medical emergency that requires immediate medical attention. Anaphylactic reactions due to antibiotics may include:
Immediately call 911 for medical help if any of these symptoms should appear after taking an antibiotic. Are Antibiotics Effective for a Cold, Flu or COVID?Antibiotics are used to kill bacterial infections; they are not effective against viral infections, such as a cold, the flu, COVID. They also do not work against fungal infections, like ringworm or vaginal yeast infections. You should avoid demanding an antibiotic from your healthcare provider when you have a viral infection as it will not cure your infection and might make it worse. In addition, this adds to the problem of antibiotic resistance, and it costs you money you do not need to spend. Your doctor can offer symptomatic treatment to ease your viral infection, or prescribe specific anti-viral medications if appropriate. If you eventually need an antibiotic because of a secondary bacterial infection that might occur later, your doctor will prescribe it then. List of Antibiotics and Their Side EffectsThere are several side effects that are common to most antibiotics, regardless of class or drug. These side effects may include:
What are the side effects of antibiotics? The most common antibiotic classes and drug members are listed in Table 1, along with the most commonly reported antibiotic side effects (list are not comprehensive). Table 1: Common Antibiotic Side Effects* Common Antibiotic ClassesAntibiotic Class MembersMost Common Class Side EffectsAdditional Clinical CommentsList of penicillins, penicillinase- resistant penicillins, and other penicillin-type drugs
If bloody stools, an extreme watery diarrhea, stools with pus, anaphylaxis (a severe allergy), urgent stomach pain, severe skin reaction, or fever occur contact health care provider immediately. Antibiotics may cause life-threatening pseudomembranous colitis and Clostridium difficile infection. List of cephalosporins
Cross-hypersensitivity may occur in patients with documented penicillin allergy; may be more common with first generation cephalosporins due to structural similarities. In one prospective study2, the rate of cross-reactivity among subjects with a positive penicillin skin test was 6%; however rates up to 10% have been reported. If you have a history of penicillin allergy, your doctor may recommend penicillin skin testing if a cephalosporin is required. List of monobactamsThe monobactams have a unique structure and are different from other beta-lactam antibiotics (eg, penicillins, cephalosporins, cephamycins). Cayston (aztreonam) inhalation is used in people who have cystic fibrosis and a certain bacteria in their lungs. This helps to improve their breathing symptoms. Aztreonam (Azactam, IV)
Aztreonam (Cayston, inhalation)
While cross-reactivity of aztreonam (Azactam) with other beta-lactam antibiotics is rare, use with caution to any patient with a history of hypersensitivity to beta-lactams (eg, penicillins, cephalosporins, and/or carbapenems).6,8 Treatment with aztreonam can result in hypersensitivity reactions in patients with or without prior exposure. List of aminoglycosides
Long-term aminoglycosides or multiple treatment periods may lead to greater risk for ototoxicity (hearing damage, loss) and renal (kidney) toxicity. Aminoglycosides are often reserved for times when less toxic antibiotics cannot be used or are ineffective. Aminoglycosides are not well absorbed by mouth, and are usually given by injection. Some products are given by inhalation for lung infection. Neomycin is given by mouth for its effects in the intestine, although it can be absorbed and toxic reactions may occur. List of carbapenems
Sides effects vary among agents, check each individually. Vitamin B6 (pyridoxine) may be taken to help prevent peripheral neuropathy with isoniazid. List of glycopeptides
IV infusion of vancomycin over 60 minutes may help to prevent RMS. Other cases of RMS due to other antibiotics have been reported, including: rifampin, cefepime, teicoplanin, ciprofloxacin, and amphotericin B.7 List of macrolide antibiotics
High rate of gastrointestinal (stomach) side effects. Do not crush, chew, break, open enteric-coated or delayed-release pills. List of sulfonamides (antibiotic)
Avoid prolonged sunlight exposure; use sunscreen, and wear protective clothing. Sulfonamide allergic reactions have been reported in roughly 1.5% to 3% of the general population. Learn more about sulfa allergies here. May lead to severe skin reactions: Stevens Johnson Syndrome, Toxic Epidermal Necrolysis. List of tetracyclines
Avoid prolonged sunlight exposure, use sunscreen, wear protective clothing. The development of bacterial resistance has limited the effectiveness of this class of drugs, although they may still be used in human and animal medicine. List of fluoroquinolones (quinolones)
Due to a risk for serious adverse reactions, doctors may withhold use of this class unless absolutely required for more serious or unresponsive infections. Avoid prolonged sunlight exposure; use sunscreen, wear protective clothing. See FDA alerts and boxed warnings for fluoroquinolones: tendon rupture, tendonitis, peripheral neuropathy, aggravation of myasthenia gravis, aortic aneurysm or dissection, low blood sugar, mental status changes. List of lincomycin derivatives
Avoid alcohol use and or propylene glycol use during treatment and for up to 3 days after treatment stopped. Combined use with alcohol may lead to cramps, nausea/vomiting, flushing, headache; may discolor urine red-brown. *This is not a complete list of common antibiotics or side effects that may occur. For a complete list of side effects, please refer to the individual drug monographs. Allergic Reactions, Anaphylaxis: Allergic reactions account for the most common type of side effect with antibiotics.
Antibiotic-associated diarrhea: Antibiotic-associated diarrhea occurs in patients receiving antibiotics.
Vaginal yeast infections or oral thrush (candida species): Antibiotics may also change the normal flora balance in the vagina, often leading to an overgrowth of fungal species.
Stevens Johnson Syndrome (SJS), Toxic Epidermal Necrolysis (TEN): Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are rare but serious allergic reactions to substances, often medications, that result in severe skin and mucous membrane disorders.
Injection site reactions or phlebitis: A reaction to an antibiotic can occur if the antibiotic is given intravenously (IV) into a vein.
Antibiotics are among the most commonly prescribed medications in the US. However, many side effects may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA or call 1-800-FDA-1088 (1-800-332-1088). See alsoLearn moreTreatment optionsCare guidesSymptoms and treatmentsMedicine.com guides (external)Sources
Further informationAlways consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances. What are possible side effects to taking antimicrobial drugs?In rare cases, an antibiotic can cause a severe and potentially life-threatening allergic reaction known as anaphylaxis.. a raised, itchy skin rash (urticaria, or hives). coughing.. wheezing.. tightness of the throat, which can cause breathing difficulties.. What is the most common potentially serious adverse effect of antimicrobial drugs?Hypersensitivity adverse reactions to an antibiotic (e.g., penicillin) or its metabolic products can frequently occur, causing serious problems ranging from urticaria (hives) to anaphylactic shock.
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