JULMENTIN FORTE 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

• Acute bacterial sinusitis
• Acute otitis media
• Community-acquired pneumonia
• Skin and soft tissue infections
• Urinary tract infections

Dosage

Children: Refer to BNF for

Adults: Refer to BNF for specific dosing; typical adult dosing is based on the severity of the infection and the sensitivity of the organism.

Mechanism of action

Amoxicillin works by inhibiting bacterial cell wall synthesis through binding to penicillin-binding proteins, leading to cell lysis and death. Clavulanic acid inhibits beta-lactamase enzymes produced by certain bacteria, which would otherwise inactivate amoxicillin. By protecting amoxicillin from degradation, clavulanic acid allows for sustained antibacterial activity against resistant strains.

Pharmacodynamics

The combination of amoxicillin and clavulanic acid provides a synergistic effect, improving the bactericidal activity against a broader range of bacteria. The pharmacodynamic profile includes time-dependent killing, with efficacy related to the time that serum concentrations exceed the minimum inhibitory concentration (MIC) of the target organism. The presence of clavulanic acid enhances the spectrum of activity of amoxicillin, making it effective against both gram-positive and gram-negative bacteria.

Pharmacokinetics

After oral administration, amoxicillin is rapidly absorbed, with peak plasma concentrations occurring within 1-2 hours. Clavulanic acid is also well absorbed, although it has a shorter half-life compared to amoxicillin. Both components are widely distributed in body tissues and fluids, including bile and urine. Amoxicillin is primarily excreted via the kidneys, with less than 20% metabolized by the liver. Clavulanic acid is also excreted renally, with a significant portion being excreted unchanged in the urine.

Contra-indications

• Hypersensitivity to clavulanic acid or any component of the formulation
• Previous history of jaundice or hepatic dysfunction associated with amoxicillin-clavulanate

Adverse effects

• Diarrhea
• Nausea
• Vomiting
• Rash
• Hepatotoxicity
• Allergic reactions
• Superinfection
• Candidiasis

Interactions

• Probenecid may increase plasma concentrations of amoxicillin
• Anticoagulants may have altered effects due to antibiotic therapy
• Methotrexate may have increased toxicity

Precautions

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

Pregnancy

Clavulanic acid can be used during pregnancy if the benefits outweigh the risks. Animal studies have not shown teratogenic effects.

Breast-feeding

Clavulanic acid is excreted in breast milk. It is generally considered safe for use during breastfeeding but should be used with caution.

Storage

Store in a cool, dry place, away from direct sunlight. Once reconstituted, refrigerate and use within the specified time frame.

Formulations

• Tablets
• Oral suspension
• Injection

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.