Cefadroxil Sandoz: Uses, Dosage & Side Effects
A first-generation cephalosporin antibiotic prescribed for urinary tract infections, skin infections, pharyngitis, and pneumonia
Cefadroxil Sandoz is a prescription antibiotic belonging to the first-generation cephalosporin class. It is used to treat a range of bacterial infections, including urinary tract infections (UTIs), skin and soft tissue infections, pharyngitis (sore throat), and pneumonia. Cefadroxil works by preventing bacteria from forming new cell walls, which leads to bacterial death. It is taken orally as a 500 mg hard capsule, typically once or twice daily, and is effective against many common Gram-positive and some Gram-negative pathogens.
Quick Facts
Key Takeaways
- Cefadroxil Sandoz is a first-generation cephalosporin antibiotic that kills bacteria by disrupting cell wall synthesis, effective against many common pathogens.
- It is prescribed for urinary tract infections, skin and soft tissue infections, streptococcal pharyngitis, and community-acquired pneumonia.
- The standard adult dose is 1 gram (two 500 mg capsules) per day, taken as a single dose or divided into two doses 12 hours apart.
- Use with caution if you have a penicillin allergy, as cross-reactivity between penicillins and cephalosporins can occur in 1–10% of cases.
- Always complete the full prescribed course of antibiotics, even if you feel better, to prevent antibiotic resistance and recurrence of infection.
What Is Cefadroxil Sandoz and What Is It Used For?
Cefadroxil Sandoz contains the active substance cefadroxil (as monohydrate), which belongs to the cephalosporin group of antibiotics. Cephalosporins are structurally related to penicillins and share a similar mechanism of action: they inhibit bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), which are essential enzymes for the final transpeptidation step of peptidoglycan cross-linking. Without an intact cell wall, bacteria undergo osmotic lysis and die. This makes cefadroxil a bactericidal agent rather than merely bacteriostatic.
As a first-generation cephalosporin, cefadroxil has excellent activity against many Gram-positive organisms, including Staphylococcus aureus (methicillin-susceptible strains), Streptococcus pyogenes (Group A streptococcus), and Streptococcus pneumoniae. It also demonstrates clinically useful activity against several Gram-negative bacteria such as Escherichia coli, Proteus mirabilis, and Klebsiella pneumoniae. However, it has limited activity against many other Gram-negative organisms and is not effective against methicillin-resistant Staphylococcus aureus (MRSA), Pseudomonas aeruginosa, or anaerobic bacteria.
Cefadroxil is particularly valued for its long half-life of approximately 1.2 to 1.5 hours, which allows for convenient once-daily or twice-daily dosing. It is well absorbed from the gastrointestinal tract with an oral bioavailability of approximately 90%, and food does not significantly reduce total absorption. Peak plasma concentrations are typically reached within 1.5 to 2 hours after oral administration. The drug is primarily excreted unchanged by the kidneys through glomerular filtration and tubular secretion.
Approved Indications
Cefadroxil Sandoz is approved for the treatment of the following infections when caused by susceptible bacterial strains:
- Urinary tract infections (UTIs): Including uncomplicated lower UTIs (cystitis) and upper UTIs (pyelonephritis) caused by E. coli, P. mirabilis, and Klebsiella species.
- Skin and soft tissue infections: Including cellulitis, wound infections, and abscesses caused by S. aureus and S. pyogenes.
- Pharyngitis and tonsillitis: Infections caused by Streptococcus pyogenes (Group A beta-hemolytic streptococcus), including prevention of rheumatic fever.
- Community-acquired pneumonia: When caused by susceptible organisms such as S. pneumoniae.
Cefadroxil, the active substance in Cefadroxil Sandoz, may also be approved for the treatment of other infections not specifically listed here. Always follow the instructions given by your prescribing healthcare provider, as the choice of antibiotic depends on local resistance patterns, culture results, and the specific clinical situation.
What Should You Know Before Taking Cefadroxil Sandoz?
Contraindications
You must not take Cefadroxil Sandoz if you have a known allergy (hypersensitivity) to cefadroxil, any other cephalosporin antibiotic, or any of the other ingredients in the capsule (listed in the Ingredients section below). An allergic reaction to a cephalosporin can range from mild skin rash to severe, life-threatening anaphylaxis. If you have experienced any allergic reaction to a cephalosporin in the past, this medication is contraindicated.
Warnings and Precautions
Talk to your doctor or pharmacist before taking Cefadroxil Sandoz if any of the following apply to you:
If you are allergic to penicillin or other beta-lactam antibiotics, inform your doctor before taking cefadroxil. Cross-reactivity between penicillins and cephalosporins occurs in approximately 1–10% of patients. While first-generation cephalosporins have a slightly higher rate of cross-reactivity than newer generations, the actual risk of a serious reaction in patients with a mild penicillin allergy is relatively low. However, cefadroxil should not be used if you have a history of immediate-type hypersensitivity (anaphylaxis) to any penicillin.
- Kidney impairment: Cefadroxil is primarily excreted by the kidneys. If you have reduced kidney function (renal impairment), your doctor may need to adjust your dose or monitor your kidney function during treatment to prevent drug accumulation and toxicity.
- Gastrointestinal disease: If you have a history of gastrointestinal disease, especially colitis (inflammation of the colon), use cefadroxil with caution. Antibiotics can disrupt the normal gut flora and increase the risk of Clostridioides difficile-associated diarrhea (CDAD), which can range from mild diarrhea to life-threatening pseudomembranous colitis.
- Diabetes testing: Cefadroxil may cause a false-positive result for glucose in the urine when using copper-based reduction tests (such as Benedict’s solution, Fehling’s solution, or Clinitest tablets). This does not occur with enzyme-based glucose tests (such as Clinistix or glucose oxidase strips). If you are diabetic, inform your doctor and use enzyme-based tests during treatment.
Serious skin reactions including Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), drug reaction with eosinophilia and systemic symptoms (DRESS), and acute generalized exanthematous pustulosis (AGEP) have been reported with beta-lactam antibiotics including cephalosporins. Stop taking cefadroxil and seek immediate medical attention if you develop a widespread skin rash with blisters, peeling skin, sores in the mouth or eyes, or systemic symptoms such as fever and swollen lymph nodes.
Pregnancy and Breastfeeding
If you are pregnant, think you may be pregnant, planning to become pregnant, or are breastfeeding, ask your doctor or pharmacist for advice before taking this medicine.
Pregnancy: Cefadroxil is generally considered safe for use during pregnancy. Animal reproduction studies have not demonstrated teratogenic effects, and cephalosporins as a class are among the antibiotics most commonly used in pregnant patients. The FDA previously classified cefadroxil as Pregnancy Category B. However, as with all medications, cefadroxil should only be used during pregnancy when clearly needed and when the potential benefit justifies the potential risk to the fetus. Your doctor will weigh the benefits and risks for your specific situation.
Breastfeeding: Small amounts of cefadroxil are excreted into breast milk, but the dose the infant would receive is significantly lower than the therapeutic dose. Breastfeeding can generally continue during treatment with cefadroxil. However, breastfeeding (or treatment) should be interrupted if the infant develops diarrhea, oral thrush (fungal infection in the mouth), or skin rash. Monitor your baby for any unusual symptoms and consult your healthcare provider if concerns arise.
Driving and Using Machines
Cefadroxil Sandoz is not known to affect the ability to drive or operate machinery. However, as with any medication, you should be aware of how you feel before driving or operating heavy equipment. In very rare cases, side effects such as dizziness or headache may occur, which could impair your ability to concentrate.
Sodium Content
This medicine contains less than 1 mmol (23 mg) of sodium per capsule, meaning it is essentially sodium-free. This is relevant for patients on a controlled sodium diet.
How Does Cefadroxil Sandoz Interact with Other Drugs?
Drug interactions can alter the way your medications work or increase your risk of side effects. It is essential to tell your doctor or pharmacist about all prescription medicines, over-the-counter drugs, vitamins, and herbal supplements that you are currently taking or plan to take. Below is a summary of the most clinically important interactions with cefadroxil.
| Interacting Drug | Type | Effect | Clinical Advice |
|---|---|---|---|
| Probenecid | Major | Probenecid inhibits renal tubular secretion of cefadroxil, increasing blood levels and prolonging its half-life | Doctor may need to adjust cefadroxil dose; increased monitoring recommended |
| Warfarin / Anticoagulants | Moderate | Cephalosporins may enhance the anticoagulant effect, increasing the risk of bleeding | Monitor INR more frequently; dose adjustment of anticoagulant may be needed |
| Loop diuretics (e.g., furosemide) | Moderate | Forced diuresis may decrease cefadroxil blood levels; high-dose loop diuretics may increase nephrotoxicity risk | Avoid high-dose diuretics during cefadroxil treatment; monitor renal function |
| Aminoglycosides (e.g., gentamicin) | Major | Concurrent use may increase the risk of nephrotoxicity (kidney damage) | Monitor renal function closely if combination is necessary; dose adjustments may be required |
| Cholestyramine | Minor | May reduce absorption of cefadroxil if taken simultaneously | Separate administration by at least 2 hours |
| Metformin | Minor | Cefadroxil may compete for renal tubular transport, potentially increasing metformin levels | Monitor blood glucose levels; usually clinically insignificant at standard doses |
Food and Drink
Cefadroxil Sandoz should be taken with food, preferably during or after a meal. While food does not significantly affect the total amount of cefadroxil absorbed (bioavailability), taking the capsule with food can help reduce gastrointestinal discomfort such as nausea or stomach upset. There are no specific food restrictions during treatment. Alcohol does not have a direct chemical interaction with cefadroxil (unlike metronidazole or certain other antibiotics), but drinking alcohol while fighting an infection may impair immune function and delay recovery. It is generally advisable to limit alcohol consumption during any course of antibiotics.
What Is the Correct Dosage of Cefadroxil Sandoz?
Always take Cefadroxil Sandoz exactly as your doctor or pharmacist has told you. The dose is individually determined based on the type of infection, its severity, your age, body weight, and kidney function. Do not change your dose or stop treatment without consulting your doctor. Below are the general dosing recommendations.
Adults and Children Over 40 kg
Standard Dosing
The recommended dose is 1 gram (1000 mg) per day, which equals two 500 mg capsules. The total daily dose may be taken as:
- Once daily: Both capsules taken together at the same time each day, or
- Twice daily: One capsule every 12 hours (e.g., morning and evening)
For more severe infections, your doctor may increase the dose to 2 grams per day (four capsules), divided into two doses.
| Indication | Daily Dose | Frequency | Duration |
|---|---|---|---|
| Uncomplicated UTI | 1–2 g | Once or twice daily | 7–14 days |
| Skin & soft tissue infections | 1 g | Once or twice daily | 10–14 days |
| Pharyngitis / Tonsillitis | 1 g | Once or twice daily | 10 days minimum |
| Community-acquired pneumonia | 1–2 g | Twice daily | 7–14 days |
Children Under 40 kg
Pediatric Dosing
Dosage for children weighing less than 40 kg is based on body weight and must be determined by the prescribing physician. The general recommended pediatric dose is 25–50 mg per kg of body weight per day, divided into one or two doses. Your doctor will calculate the appropriate dose. Cefadroxil is available in other formulations (such as oral suspension) that may be more appropriate for younger children who cannot swallow capsules.
Elderly Patients
No specific dose adjustment is generally required for elderly patients with normal kidney function. However, since kidney function naturally declines with age, your doctor may assess your renal function before prescribing and adjust the dose accordingly. Elderly patients may also be more susceptible to antibiotic-associated diarrhea and Clostridioides difficile infection.
Patients with Kidney Impairment
If you have impaired kidney function, your doctor will adjust your dose based on your creatinine clearance (CrCl). Dose reduction or extended dosing intervals may be necessary to prevent accumulation of the drug. Your doctor will determine the appropriate dose based on your laboratory results.
What If You Miss a Dose?
If you forget to take a dose, take it as soon as you remember unless it is almost time for your next scheduled dose. In that case, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. Setting an alarm or taking your medicine at the same time each day can help you remember.
Overdose
If you or someone else has taken too much Cefadroxil Sandoz, or if a child has accidentally swallowed the medicine, contact your local poison control center or emergency department immediately. Signs and symptoms of overdose may include severe nausea, vomiting, diarrhea, abdominal pain, convulsions (seizures), electrolyte disturbances, kidney failure, changes in blood cell counts, decreased consciousness, or acidosis (symptoms include headache, fatigue, nausea, and deep rapid breathing). Treatment is supportive and symptomatic; hemodialysis may be effective in removing cefadroxil from the blood.
Why You Must Complete the Full Course
Do not stop taking Cefadroxil Sandoz without consulting your doctor, even if you feel better after a few days. It is critical to complete the entire prescribed course of antibiotics. Stopping treatment early can allow surviving bacteria to grow back, potentially making the infection harder to treat. Incomplete courses of antibiotics are a major contributor to the global problem of antimicrobial resistance (AMR), which is recognized by the WHO as one of the top ten threats to global public health.
What Are the Side Effects of Cefadroxil Sandoz?
Like all medicines, Cefadroxil Sandoz can cause side effects, although not everyone gets them. Most side effects are mild and resolve after stopping treatment. However, some side effects can be serious and require immediate medical attention. Contact your doctor or go to the nearest emergency department immediately if you experience any of the serious side effects described below.
- You experience symptoms of a severe allergic reaction (angioedema or anaphylaxis): swelling of the face, tongue, or throat; difficulty swallowing; hives; difficulty breathing; or chest tightness
- You develop signs of a serious blood disorder (agranulocytosis): fever with severely worsened general condition, sore throat, mouth ulcers, or difficulty urinating
- You notice blood in your urine, cloudy urine, produce little or no urine, or have pain in the lower back – these may be signs of kidney problems
- You develop prolonged or severe diarrhea, which may indicate Clostridioides difficile-associated colitis
- You develop a severe skin reaction with widespread blisters, peeling skin, or sores in the mouth, eyes, or genitals
- Your skin appears unusually pale or yellow and you feel weak or short of breath, which may indicate hemolytic anemia
Side Effects by Frequency
Common
- Diarrhea
- Abdominal pain and stomach discomfort
- Nausea and vomiting
- Heartburn (dyspepsia)
- Inflammation of the tongue (glossitis)
- Skin rash, hives (urticaria), and itching
Rare
- Severe allergic reactions (anaphylaxis, angioedema)
- Serum sickness-like reaction (fever, malaise, swollen glands, joint pain)
- Joint pain (arthralgia)
- Vaginal and oral fungal infections (candidiasis)
- Unexplained bruising or bleeding (thrombocytopenia)
- Increase in certain white blood cells (eosinophilia)
- Decrease in white blood cells (agranulocytosis) – increased risk of infection
- Kidney problems (interstitial nephritis)
Very Rare
- Headache
- Dizziness
- Nervousness
- Insomnia (difficulty sleeping)
- Fatigue
Not Known
- Elevated liver enzymes (detected via blood tests)
- Skin rash on the face, arms, and legs
- Stevens-Johnson syndrome (SJS)
- Toxic epidermal necrolysis (TEN)
- Drug reaction with eosinophilia and systemic symptoms (DRESS)
- Acute generalized exanthematous pustulosis (AGEP)
- Clostridioides difficile-associated diarrhea (pseudomembranous colitis)
- Hemolytic anemia (destruction of red blood cells)
Managing Common Side Effects
Most common side effects of cefadroxil are gastrointestinal in nature and can be minimized by taking the capsules with food. If you experience mild diarrhea, stay well hydrated and avoid dairy products and high-fiber foods until symptoms resolve. Probiotic supplements containing Lactobacillus or Saccharomyces boulardii may help restore healthy gut flora during and after antibiotic treatment, although evidence is mixed. Do not take anti-diarrheal medications (such as loperamide) without consulting your doctor first, as they may mask more serious conditions like C. difficile colitis.
Vaginal or oral candidiasis (thrush) is a known consequence of antibiotic use, as antibiotics can disrupt the normal microbial balance. If you develop symptoms such as white patches in the mouth, vaginal itching, or unusual discharge, consult your doctor for appropriate antifungal treatment.
If you experience any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this guide. You can also report side effects directly to your national medicines regulatory authority (e.g., the FDA MedWatch program in the United States, the Yellow Card scheme in the United Kingdom, or the EMA pharmacovigilance system in the European Union). By reporting side effects, you can help provide more information on the safety of this medicine.
How Should You Store Cefadroxil Sandoz?
Proper storage of your medication is essential to ensure it remains safe and effective throughout your treatment course. Follow these storage guidelines for Cefadroxil Sandoz capsules:
- Temperature: Store below 25°C (77°F) at room temperature. Do not refrigerate or freeze.
- Moisture: Keep the capsules in their original blister packaging until you are ready to take them. This protects them from moisture.
- Light: Store in the original carton to protect from light.
- Children: Keep out of the sight and reach of children at all times.
- Expiry date: Do not use this medicine after the expiry date shown on the carton after “EXP.” The expiry date refers to the last day of that month.
Do not throw away medicines via wastewater (down the sink or toilet) or in household waste. Ask your pharmacist how to dispose of medicines that are no longer needed. These measures help protect the environment and prevent accidental exposure. Unused or expired antibiotics should never be saved for future use or shared with others, as the wrong antibiotic or dose can be ineffective or harmful.
What Does Cefadroxil Sandoz Contain?
Understanding the full composition of your medication is important, particularly if you have known allergies or intolerances to any pharmaceutical excipients. Below is the complete list of ingredients in Cefadroxil Sandoz 500 mg hard capsules.
Active Substance
The active substance is cefadroxil (as monohydrate). Each hard capsule contains 500 mg of cefadroxil. Cefadroxil monohydrate is the stable crystalline form of the drug, which ensures consistent bioavailability and shelf life.
Inactive Ingredients (Excipients)
- Magnesium stearate: A lubricant used in capsule manufacturing to prevent the powder from sticking to equipment.
- Sodium lauryl sulfate: A surfactant that aids in the dissolution and absorption of the active ingredient.
- Microcrystalline cellulose: A commonly used filler and binder in pharmaceutical capsules.
- Gelatin: Used to form the capsule shell. Note: this product is not suitable for patients who avoid gelatin for dietary, religious, or ethical reasons.
- Titanium dioxide (E 171): A white colorant used in the capsule shell to provide opacity and protect the active ingredient from light.
Appearance and Pack Sizes
Cefadroxil Sandoz 500 mg hard capsules are white, opaque capsules. They are available in blister packs of 14, 20, 30, 100, and 100×1 capsules. Not all pack sizes may be marketed in all countries. The manufacturer is Sandoz GmbH, Biochemiestrasse 10, A-6250 Kundl, Austria.
Frequently Asked Questions About Cefadroxil Sandoz
Cefadroxil Sandoz is a first-generation cephalosporin antibiotic used to treat bacterial infections including urinary tract infections (UTIs), skin and soft tissue infections, pharyngitis and tonsillitis caused by Streptococcus pyogenes, and community-acquired pneumonia caused by susceptible organisms. It works by killing bacteria through inhibition of cell wall synthesis. It is not effective against viral infections such as the common cold or influenza.
Caution is required. Approximately 1–10% of patients with a penicillin allergy may also react to cephalosporins due to cross-reactivity between beta-lactam antibiotics. If you have had a mild reaction to penicillin, your doctor may prescribe cefadroxil with careful monitoring. However, if you have a history of severe allergic reactions (anaphylaxis) to any penicillin, cefadroxil is generally contraindicated. Always inform your doctor about any previous antibiotic allergies before starting treatment.
A typical treatment course lasts 7 to 14 days depending on the type and severity of infection. For streptococcal pharyngitis, a minimum of 10 days is recommended to prevent complications such as rheumatic fever. For uncomplicated urinary tract infections, shorter courses of 7 to 10 days may be sufficient. It is essential to complete the full prescribed course even if symptoms improve, as stopping early may allow resistant bacteria to survive and the infection to return.
Cefadroxil is generally considered safe during pregnancy. Animal studies have not shown teratogenic effects, and cephalosporins are one of the antibiotic classes commonly used in pregnant patients when treatment is necessary. However, as with all medications during pregnancy, it should only be used when the potential benefit justifies the potential risk. Always consult your healthcare provider before taking any medication during pregnancy.
Yes, Cefadroxil Sandoz should be taken with food, preferably during or after a meal. While food does not significantly affect the total absorption of cefadroxil, taking it with a meal helps reduce the likelihood of gastrointestinal side effects such as nausea, vomiting, and stomach discomfort. Swallow the capsule whole with at least half a glass of water. Try to take it at approximately the same time each day to maintain consistent blood levels of the antibiotic.
Cefadroxil is a first-generation cephalosporin antibiotic, while amoxicillin is an aminopenicillin. Both are beta-lactam antibiotics that inhibit bacterial cell wall synthesis, but they belong to different subclasses. Key differences include: cefadroxil has a longer half-life that may allow once-daily dosing; cefadroxil is generally more resistant to certain bacterial beta-lactamases compared to amoxicillin; and cefadroxil may be used as an alternative in patients who cannot tolerate amoxicillin but do not have a severe penicillin allergy. Your doctor will choose the most appropriate antibiotic based on the type of infection and local resistance patterns.
References
This article is based on the following peer-reviewed sources and international medical guidelines. All medical claims are evidence-based and adhere to the GRADE framework.
- 1 World Health Organization (WHO). WHO Model List of Essential Medicines – 23rd List, 2023. Geneva: WHO; 2023. Available at: who.int.
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- 3 U.S. Food and Drug Administration (FDA). Cefadroxil Capsules – Prescribing Information. Silver Spring, MD: FDA; 2023.
- 4 British National Formulary (BNF). Cefadroxil Monograph. London: BMJ Group and Pharmaceutical Press; 2024. Available at: bnf.nice.org.uk.
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- 6 Pichichero ME. A review of evidence supporting the American Academy of Pediatrics recommendation for prescribing cephalosporin antibiotics for penicillin-allergic patients. Pediatrics. 2005;115(4):1048–1057. doi:10.1542/peds.2004-1276.
- 7 Infectious Diseases Society of America (IDSA). Clinical Practice Guidelines for the Diagnosis and Management of Group A Streptococcal Pharyngitis. Clin Infect Dis. 2012;55(10):e86–e102.
- 8 National Institute for Health and Care Excellence (NICE). Antimicrobial prescribing guidelines. London: NICE; 2024. Available at: nice.org.uk.
- 9 World Health Organization (WHO). Antimicrobial Resistance: Global Report on Surveillance. Geneva: WHO; 2023. Available at: who.int.
- 10 Guay DR. Cefadroxil: An updated review of its use in treating urinary tract infections and skin and soft tissue infections. Drugs. 1996;51(5):825–847. doi:10.2165/00003495-199651050-00008.
About the Medical Editorial Team
This article has been written and reviewed by the iMedic Medical Editorial Team, comprising board-certified physicians and clinical pharmacologists with expertise in infectious disease and antimicrobial therapy. Our editorial process follows the GRADE evidence framework and adheres to international medical guidelines from the WHO, EMA, FDA, BNF, and NICE.
Content authored by physicians specializing in clinical pharmacology and infectious disease, with documented experience in antimicrobial prescribing and drug safety monitoring.
Independently reviewed by the iMedic Medical Review Board, an expert panel that ensures all content is accurate, up-to-date, balanced, and aligned with current clinical guidelines.
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