AMOVULIN 457MG/5ML POWDER FOR ORAL SUSPENSION

Indications

• Bacterial infections
• Respiratory tract infections
• Otitis media
• Urinary tract infections
• Skin and soft tissue infections
• Gastrointestinal infections

Dosage

Children: Refer to BNF for Children for specific dosing information based on the child's weight and age.

Adults: Dosage varies based on the type and severity of infection, typically ranging from 250 mg to 500 mg every 8 hours or 500 mg to 875 mg every 12 hours.

Mechanism of action

Amoxicillin exerts its antibacterial effects by binding to penicillin-binding proteins (PBPs) located on the inner membrane of the bacterial cell wall. This binding inhibits the transpeptidation enzyme, which is critical for the cross-linking of peptidoglycan layers in the bacterial cell wall. As a result, the integrity of the cell wall is compromised, causing cell lysis and death.

Pharmacodynamics

Amoxicillin demonstrates time-dependent bactericidal activity. The efficacy of amoxicillin is related to the duration of time that the drug concentration remains above the minimum inhibitory concentration (MIC) for the target bacteria. It is generally well absorbed from the gastrointestinal tract and has a longer half-life than some other penicillins, allowing for less frequent dosing.

Pharmacokinetics

Amoxicillin is rapidly absorbed following oral administration, with peak plasma concentrations occurring within 1 to 2 hours. It has a bioavailability of approximately 75-90%. The drug is widely distributed throughout the body, including into the lungs, kidneys, and middle ear. Amoxicillin is primarily excreted unchanged in the urine, with a half-life of about 1 to 1.5 hours in healthy individuals. Adjustments may be necessary in patients with renal impairment.

Contra-indications

• Hypersensitivity to amoxicillin or any other penicillin antibiotics
• History of severe allergic reactions (anaphylaxis) to beta-lactam antibiotics
• Infectious mononucleosis (associated with increased risk of rash)

Adverse effects

• Gastrointestinal disturbances (nausea, vomiting, diarrhea)
• Rash and urticaria
• Hepatic dysfunction (elevated liver enzymes)
• Renal impairment
• Superinfection (overgrowth of non-susceptible organisms)
• Anaphylaxis (rare but serious allergic reaction)

Interactions

• Reduced efficacy of oral contraceptives
• Increased risk of anticoagulant effects with warfarin
• Probenecid may increase amoxicillin levels
• Methotrexate clearance may be reduced

Precautions

• Use with caution in patients with renal impairment
• Monitor patients for signs of anaphylaxis following administration
• Caution in patients with a history of gastrointestinal disease, particularly colitis
• Adjust dosage in patients with severe hepatic dysfunction

Pregnancy

Amoxicillin is generally considered safe to use during pregnancy, particularly in the second and third trimesters. However, it should only be used if clearly needed.

Breast-feeding

Amoxicillin is excreted in breast milk. It is usually considered safe for use during breastfeeding, but monitoring for potential effects on the infant is advisable.

Storage

Store in a cool, dry place away from direct sunlight. Reconstituted solutions should be stored in the refrigerator and used within a specified time frame as indicated.

Formulations

• Capsules
• Tablets
• Oral suspension
• Injectable formulations

Indications

• Infections caused by beta-lactamase-producing bacteria
• Acute bacterial sinusitis
• Acute otitis media
• Lower respiratory tract infections
• Urinary tract infections

Dosage

Children: Refer to the BNF for Children for specific dosing according to age and weight; adjustments may be necessary based on the clinical scenario.

Adults: Refer to specific product guidelines for dosing; typical regimens depend on the combination antibiotic used and the severity of the infection.

Mechanism of action

Clavulanic acid works by irreversibly binding to the active site of beta-lactamase enzymes that are produced by certain bacteria to inactivate beta-lactam antibiotics. By inhibiting these enzymes, clavulanic acid protects the penicillin antibiotic from degradation, allowing it to exert its antibacterial effects.

Pharmacodynamics

Clavulanic acid has a synergistic effect when combined with other antibiotics, particularly amoxicillin. The presence of clavulanic acid allows for the effective treatment of infections caused by bacteria that would otherwise be resistant to penicillins. Its antibacterial activity is generally weak on its own but significantly enhances the efficacy of other beta-lactam antibiotics.

Pharmacokinetics

Clavulanic acid is rapidly absorbed after oral administration, with peak plasma concentrations occurring within 1 hour. It is widely distributed throughout the body and has a half-life of approximately 1 hour. The drug is primarily excreted unchanged in the urine. In the presence of renal impairment, dosage adjustment may be necessary, as the elimination of clavulanic acid can be affected.

Contra-indications

• Hypersensitivity to clavulanic acid or any of the excipients
• History of jaundice or hepatic impairment associated with previous use of penicillins or beta-lactam antibiotics

Adverse effects

• Nausea
• Diarrhea
• Rash
• Elevated liver enzymes
• Allergic reactions including anaphylaxis
• Superinfection

Interactions

• May enhance the effects of anticoagulants such as warfarin
• Probenecid may increase plasma concentrations of clavulanic acid
• May reduce the efficacy of oral contraceptives

Precautions

• Caution in patients with renal impairment
• Monitor liver function in patients receiving prolonged therapy
• Use with caution in patients with a history of allergic reactions to beta-lactams

Pregnancy

Clavulanic acid is categorized as pregnancy category B. Animal studies have not shown any harm to the fetus, but there are no adequate and well-controlled studies in pregnant women.

Breast-feeding

Clavulanic acid is excreted in breast milk, but it is generally considered safe for use during breastfeeding. Monitor for potential effects in the infant.

Storage

Store at room temperature, away from moisture and heat. Protect from light. Keep out of reach of children.

Formulations

• Oral tablets
• Oral suspension
• Injectable forms