Cefradine is a first-generation cephalosporin antibiotic effective against a range of bacterial infections, including those of the respiratory tract, urinary tract, skin, and ears. It works by interfering with bacterial cell wall synthesis, leading to bacterial death.
About cefradine
Cefradine, also known as cephradine, belongs to the first-generation cephalosporin class of antibiotics. These semi-synthetic drugs mimic penicillin structure and target penicillin-binding proteins in bacteria, disrupting cell wall formation. Developed in the 1970s, cefradine offers broad-spectrum activity against gram-positive bacteria like streptococci and staphylococci, and some gram-negative organisms such as E. coli and Klebsiella.
Approved for use in various countries, it is available under brand names like Velosef and generics. Unlike broader-spectrum later cephalosporins, cefradine’s narrower focus reduces resistance risks when targeting susceptible pathogens. It is rapidly absorbed orally, achieving peak serum levels within 1-2 hours, with a half-life of about 1-2 hours, necessitating multiple daily doses.
Key characteristics include good tissue penetration for skin, respiratory, and urinary infections, but limited central nervous system access. It is primarily excreted unchanged by the kidneys, requiring dose adjustments in renal impairment.
Key facts about cefradine
- Cefradine is a first-generation cephalosporin antibiotic.
- It is used to treat bacterial infections of the respiratory tract, ears, skin, throat, urinary tract, and other sites.
- Treatment typically lasts 5-10 days, depending on infection severity.
- Common side effects include diarrhea, nausea, rash, and allergic reactions.
- Around 5-10% of penicillin-allergic patients may cross-react with cefradine.
- Not suitable for viral infections like colds or flu.
About infections
Bacterial infections occur when harmful bacteria multiply in body tissues, causing inflammation and symptoms like fever, pain, or discharge. Common sites include lungs (pneumonia), throat (pharyngitis), ears (otitis media), skin (cellulitis), and urinary tract (cystitis). Diagnosis often involves clinical assessment, cultures, or rapid tests to identify pathogens like Streptococcus pneumoniae, Staphylococcus aureus, Haemophilus influenzae, E. coli, or Proteus mirabilis.
Untreated infections can spread, leading to sepsis or chronic issues. Antibiotics like cefradine target susceptible bacteria, but overuse promotes resistance. Most infections respond within 48-72 hours; persistent symptoms warrant medical review.
How cefradine works
Cefradine binds to penicillin-binding proteins (PBPs), inhibiting peptidoglycan cross-linking essential for bacterial cell walls. This triggers autolysins, causing cell lysis, particularly in actively dividing bacteria. Effective against gram-positive cocci (e.g., group A streptococci, S. pneumoniae, MSSA) and select gram-negatives (e.g., E. coli, P. mirabilis, Klebsiella spp.).
It has minimal activity against anaerobes, enterococci, or Pseudomonas. Oral bioavailability exceeds 90%, with distribution to most tissues except CSF. Metabolism is negligible; 80-90% is renally excreted, making it ideal for UTIs.
When to take cefradine
Prescribed for confirmed or suspected bacterial infections responsive to first-generation cephalosporins:
- Respiratory tract infections: Tonsillitis, pharyngitis, sinusitis, otitis media, bronchitis, lobar pneumonia (due to S. pyogenes, S. pneumoniae, H. influenzae).
- Skin and soft tissue infections: Cellulitis, impetigo, wound infections (staphylococci, beta-hemolytic streptococci).
- Urinary tract infections: Cystitis, pyelonephritis, prostatitis (E. coli, P. mirabilis, Klebsiella).
- Other: Bone/joint infections, peritonitis, surgical prophylaxis (e.g., appendectomy, hysterectomy).
Not for methicillin-resistant S. aureus (MRSA), enterococci, or viral/fungal infections. Culture sensitivity guides therapy.
How and when to take cefradine
Available as capsules (250mg, 500mg) or oral suspension (125mg/5ml, 250mg/5ml). Shake suspension well; use measuring device.
| Infection Type | Adult Dose | Child Dose (3 months+) | Frequency |
|---|---|---|---|
| Uncomplicated UTI, skin infections | 250-500mg | 25-50mg/kg/day | q12h |
| Serious infections (e.g., pneumonia) | 500mg-1g | 50-100mg/kg/day | q6h |
| Prostatitis | 500mg | N/A | q6h |
Take with food to reduce GI upset. Space doses evenly; complete full course. For renal impairment (CrCl <20ml/min), halve dose or extend interval. Store at room temperature; discard suspension after 14 days.
Common questions about cefradine
How long does it take to work?
Symptoms improve in 2-3 days; fever/pain reduce first. Finish course to prevent relapse.
Can I take paracetamol with cefradine?
Yes, safe for pain/fever. Avoid antacids within 2 hours as they reduce absorption.
Is cefradine safe in pregnancy?
Pregnancy category B; limited human data but no clear risks. Use if benefits outweigh risks.
Can I drink alcohol with it?
No disulfiram-like reaction, but excess alcohol impairs immunity/recovery.
What if I forget a dose?
Take ASAP unless near next dose; do not double. Inform doctor if multiple misses.
Dosage
Adults: 250mg-1g every 6-12 hours, max 4g/day. Children: 25-100mg/kg/day divided q6-12h, max 4g/day. Adjust for renal function: CrCl 25-50ml/min q12h; <25ml/min q24h or halve dose. Duration: 7-14 days typically.
Getting the most from your treatment
- Complete full course, even if feeling better.
- Take at set times for steady levels.
- Avoid probiotics/antidiarrheals without advice.
- Stay hydrated, rest to aid recovery.
- Monitor symptoms; seek help for worsening.
If you take too much (overdose)
Symptoms: nausea, vomiting, seizures (rare). Seek emergency care; treatment supportive with hemodialysis if needed.
Side effects
Most are mild/transient:
- Common (>1/100): Diarrhea, nausea, vomiting, abdominal pain, rash.
- Uncommon: Dizziness, headache, thrush, itching.
- Serious (urgent): Severe diarrhea (C. diff), anaphylaxis, jaundice, blood disorders. Stop and seek help.
GI effects from flora disruption; allergy risk 1-10% in penicillin-sensitive.
Pregnancy and breastfeeding
Category B: Animal studies safe; limited human data. Use judiciously. Excreted in breast milk at low levels (<1% dose); generally compatible, monitor infant for diarrhea/thrush.
Other medicines, food, and cefradine
Interactions:
- Probenecid: Increases levels.
- Antacids/iron: Reduce absorption.
- Warfarin: Enhances anticoagulation.
- Live vaccines: Defer during therapy.
No major food interactions; dairy ok.
Alternatives to cefradine
| Condition | Alternatives |
|---|---|
| Respiratory/ear infections | Amoxicillin, cefalexin, clarithromycin |
| Skin infections | Flucloxacillin, cephalexin |
| UTI | Nitrofurantoin, trimethoprim |
Choice based on local resistance, allergies.
Analogs of cefradine
- Cefalexin (cephalexin): Similar spectrum, better tolerated.
- Cefazolin: IV for severe infections.
- Cephalexin: Oral analog with comparable efficacy.
Frequently Asked Questions
Is cefradine a strong antibiotic?
Yes, effective for susceptible infections but not broad-spectrum like later cephalosporins.
Does cefradine treat tooth infections?
Possibly for dental abscesses if streptococcal; consult dentist for drainage/antibiotics.
Can children take cefradine?
Yes, from 3 months; dose by weight.
What if allergic to penicillin?
10% cross-reactivity risk; avoid or test first.
Does it cause yeast infections?
Possible; treat with antifungals if needed.
References
- Cefradine – Wikipedia — Wikipedia. 2023-10-15. https://en.wikipedia.org/wiki/Cefradine
- Cephradine | Johns Hopkins ABX Guide — Johns Hopkins Medicine. 2018-06-02. https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540110/all/Cephradine
- Cefradine: Uses, Interactions, Mechanism of Action | DrugBank — DrugBank. 2024-01-01. https://go.drugbank.com/drugs/DB01333
- Cephradine — Global Library of Women’s Medicine (GLOWM). 2023. https://www.glowm.com/resources/glowm/cd/pages/drugs/c040.html
- Cephradine | PubChem — National Center for Biotechnology Information (NCBI). 2024-05-20. https://pubchem.ncbi.nlm.nih.gov/compound/Cephradine
- Cephradine — Johns Hopkins Medicine OBGYN. 2023. https://oacapps.med.jhmi.edu/OBGYN-101/Pharmacy/Cephradine.htm
