cefradine

BRAND NAMES

Cefradine is marketed under several brand names in different countries. Some common brand names include:

• Velosef 
• Ceprad 
• Ceporex 
• Cefra 
• Cefadyl

MECHANISM OF ACTION

Cefradine, a first-generation cephalosporin, works by inhibiting bacterial cell wall synthesis. It binds to penicillin-binding proteins (PBPs) on the bacterial cell membrane, preventing the cross-linking of peptidoglycan chains that provide structural strength to the cell wall. This disruption weakens the cell wall, causing the bacteria to swell and eventually rupture due to osmotic pressure, leading to cell death. Because it directly destroys the bacterial cell wall, cefradine has a bactericidal effect and is particularly effective against actively growing Gram-positive and some Gram-negative bacteria.

PHARMACOKINETICS

Absorption

Cefradine is well absorbed from the gastrointestinal tract after oral administration. Its oral bioavailability is high, typically around 90%, meaning most of the drug reaches the bloodstream. Food does not significantly affect its absorption, so it can be taken with or without meals. Peak blood levels are usually achieved within 1–2 hours after a dose, allowing it to act quickly against susceptible bacteria.

Distribution

Cefradine is widely distributed in the body with a volume of distribution of 0.3–0.4 L/kg. It reaches effective concentrations in the skin, soft tissues, respiratory tract, and urine, but penetration into the CSF is poor. Plasma protein binding is low, about 15–20%, allowing good tissue availability.

Metabolism

Cefradine undergoes minimal metabolism in the body. Most of the drug remains unchanged and is excreted primarily by the kidneys. This low metabolic transformation contributes to its predictable pharmacokinetics and effectiveness in treating infections.

Excretion

Cefradine is primarily excreted unchanged by the kidneys through glomerular filtration and tubular secretion. About 60–80% of a dose is eliminated in the urine within 6–8 hours. Its renal clearance means that dose adjustment is needed in patients with impaired kidney function to prevent drug accumulation.

PHARMACODYNAMICS

Cefradine is a time-dependent, bactericidal antibiotic that works by binding to penicillin-binding proteins and inhibiting bacterial cell wall synthesis. It is most effective against Gram-positive bacteria and some Gram-negative bacteria, with its action strongest when bacteria are actively growing.

ADMINISTRATION

Cefradine is typically administered orally in the form of capsules, tablets, or oral suspension, and may also be given by intramuscular or intravenous injection in clinical settings depending on the severity of the infection; it is usually taken one to four times daily as prescribed, with or without food, although taking it with food may help reduce mild gastrointestinal discomfort, and patients are advised to complete the full course of therapy even if symptoms improve early to prevent antibiotic resistance and ensure complete eradication of the infection.

DOSAGE AND STRENGTH

• Adults: 250–500 mg every 6–12 hours, depending on the severity of infection.

• Children: 25–50 mg/kg/day divided into 3–4 doses.

• Duration: Typically 7–14 days, adjusted based on infection type and response.

CONTRAINDICATIONS

1. Allergy to cephalosporins – Patients with a known hypersensitivity to any cephalosporin should avoid cefradine.

2. Severe penicillin allergy – Cross-reactivity can occur, so caution is necessary.

3. Previous severe reaction to β-lactam antibiotics – Includes anaphylaxis, angioedema, or severe rash.

DRUG INTERACTIONS

1. Aminoglycosides (e.g., gentamicin) – May increase the risk of kidney toxicity.

2. Anticoagulants (e.g., warfarin) – Cefradine may enhance anticoagulant effects, increasing bleeding risk.

3. Probenecid – Can reduce renal excretion of cefradine, increasing its blood levels.

4. Oral contraceptives – Cephalosporins may slightly reduce effectiveness, so additional contraception is recommended.

5. Live bacterial vaccines – Antibiotics may reduce the effectiveness of oral live vaccines.

FOOD INTERACTIONS

Cefradine has minimal food interactions. It can be taken with or without food without significantly affecting its absorption or effectiveness. Taking it with food may help reduce mild gastrointestinal side effects like nausea or stomach upset, but it is not required for proper drug action.

SIDE EFFECTS

• Nausea and vomiting

• Diarrhea

• Abdominal pain

• Rash

• Headache and dizziness

• Fatigue

• Rare: Severe allergic reactions (anaphylaxis, angioedema)

• Rare: Clostridium difficile–associated diarrhea

OVER DOSE

• Symptoms: Nausea, vomiting, diarrhea, abdominal pain, dizziness, confusion, seizures

• Discontinue cefradine immediately

• Provide supportive care and maintain hydration

TOXICITY

Cefradine is generally safe, but overdose or kidney problems can cause nausea, vomiting, diarrhea, or rarely seizures. Treatment involves stopping the drug, supportive care, and monitoring kidney function.