JULMENTIN 375MG TABLETS

Indications

• Bacterial infections
• Urinary tract infections
• Sinusitis
• Uncomplicated community-acquired pneumonia
• Salmonellosis
• Oral infections
• Lyme disease (under expert supervision)
• Acute exacerbation of bronchiectasis
• Anthrax (treatment and post-exposure prophylaxis)

Dosage

Children: 1 month–11 years: 30 mg/kg 3 times a day for 21 days; children 1–4 years: 250 mg 3 times a day; children 5–11 years: 500 mg 3 times a day.

Adults: 500 mg 3 times a day; increased if necessary up to 1 g 3 times a day in severe infections.

Mechanism of action

Amoxicillin works by inhibiting bacterial cell wall synthesis, leading to cell lysis and death. It binds to penicillin-binding proteins (PBPs) located inside the bacterial cell wall, interfering with the transpeptidation process necessary for cell wall integrity.

Pharmacodynamics

Amoxicillin exhibits bactericidal activity against susceptible bacteria. Its action is time-dependent, meaning that its effectiveness is related to the duration of time that the drug concentration remains above the minimum inhibitory concentration (MIC) for the target pathogen.

Pharmacokinetics

Amoxicillin is well absorbed from the gastrointestinal tract, with peak plasma concentrations achieved within 1-2 hours after oral administration. It is widely distributed in body tissues and fluids, and it is excreted primarily via the kidneys. The elimination half-life is approximately 1 hour, and renal impairment may necessitate dosage adjustments.

Adverse effects

• Skin rash
• Gastrointestinal disturbances (nausea, vomiting, diarrhea)
• Allergic reactions (including anaphylaxis)
• Superinfection (due to resistant organisms)

Interactions

• Allopurinol (increases risk of skin rash)

Precautions

• History of penicillin allergy
• Renal impairment (reduce dose)
• Use with caution in patients with mononucleosis

Pregnancy

Use only if clearly needed; no adequate studies in pregnant women.

Breast-feeding

Amoxicillin is excreted in breast milk; use with caution.

Storage

Store in a cool, dry place away from direct sunlight.

Formulations

• Phenoxymethylpenicillin 250mg/5ml oral solution
• Phenoxymethylpenicillin 250 mg tablets

Indications

• Bacterial infections
• Respiratory tract infections
• Urinary tract infections
• Skin infections
• Intra-abdominal infections

Dosage

Children: Refer to BNF for Children for appropriate dosing based on age, weight, and specific indication.

Adults: Refer to specific guidelines for dosing based on the infection being treated, renal function, and product formulation.

Mechanism of action

Clavulanic acid works by irreversibly binding to and inhibiting beta-lactamase enzymes produced by certain bacteria. By inhibiting these enzymes, clavulanic acid protects the beta-lactam antibiotics from degradation, allowing them to exert their antibacterial effects more effectively. This mechanism enhances the spectrum of activity of antibiotics like amoxicillin against beta-lactamase-producing strains.

Pharmacodynamics

The antibacterial activity of clavulanic acid is primarily indirect, as its role is to protect other antibiotics rather than acting as a primary antibacterial agent. When used in combination with amoxicillin, it extends the antibacterial activity against Gram-positive and Gram-negative bacteria. The effectiveness is determined by the susceptibility of the bacteria to the beta-lactam antibiotic used in conjunction with clavulanic acid.

Pharmacokinetics

Clavulanic acid is rapidly absorbed after oral administration, with peak plasma concentrations typically reached within 1 hour. It is well-distributed throughout body tissues and fluids, including the liver, bile, and urine. The elimination half-life is approximately 1 hour, with renal excretion being the primary route of elimination. Dose adjustments may be necessary in patients with renal impairment.

Contra-indications

• Hypersensitivity to clavulanic acid, penicillins, or any component of the formulation
• History of cholestatic jaundice or hepatic dysfunction associated with previous use of amoxicillin-clavulanate

Adverse effects

• Nausea
• Diarrhea
• Rash
• Hepatotoxicity
• Allergic reactions
• Superinfection with non-susceptible organisms

Interactions

• Increased risk of bleeding with anticoagulants
• Probenecid may increase serum concentrations of amoxicillin
• May reduce the effectiveness of oral contraceptives

Precautions

• Use with caution in patients with renal impairment
• Monitor liver function tests during prolonged therapy
• Caution in patients with a history of gastrointestinal disease

Pregnancy

Clavulanic acid is classified as category B, meaning there is no evidence of risk in humans. Use only if clearly needed.

Breast-feeding

Clavulanic acid is excreted in breast milk, but at therapeutic doses, it is not expected to harm the nursing infant. Monitor for potential side effects.

Storage

Store at room temperature, away from moisture and direct light. Reconstituted solutions should be refrigerated and used within the recommended timeframe.

Formulations

• Oral tablets
• Oral suspension
• Intravenous infusion

Mechanism of action

Amoxicillin competitively inhibits penicillin-binding protein 1 and other high molecular weight penicillin binding proteins. Penicillin bind proteins are responsible for glycosyltransferase and transpeptidase reactions that lead to cross-linking of D-alanine and D-aspartic acid in bacterial cell walls. Without the action of penicillin binding proteins, bacteria upregulate autolytic enzymes and are unable to build and repair the cell wall, leading to bacteriocidal action. The penicillins and their metabolites are potent immunogens because of their ability to combine with proteins and act as haptens for acute antibody-mediated reactions. The most frequent (about 95 percent) or "major" determinant of penicillin allergy is the penicilloyl determinant produced by opening the beta-lactam ring of the penicillin. This allows linkage of the penicillin to protein at the amide group. "Minor" determinants (less frequent) are the other metabolites formed, including native penicillin and penicilloic acids. /Penicillins/ Amoxicillin is similar to penicillin in its bactericidal action against susceptible bacteria during the stage of active multiplication. It acts through the inhibition of cell wall biosynthesis that leads to the death of the bacteria.

Pharmacodynamics

Amoxicillin competitively inhibit penicillin binding proteins, leading to upregulation of autolytic enzymes and inhibition of cell wall synthesis. Amoxicillin has a long duration of action as it is usually given twice daily. Amoxicillin has a wide therapeutic range as mild overdoses are not associated with significant toxicity. Patients should be counselled regarding the risk of anaphylaxis, _Clostridium difficile_ infections, and bacterial resistance.