OSPAMOX 125MG

Indications

• Bacterial infections of the respiratory tract
• Acute otitis media
• Sinusitis
• Urinary tract infections
• Skin and soft tissue infections
• Helicobacter pylori eradication
• Prophylaxis for endocarditis

Dosage

Children: Refer to the BNF for Children for specific dosing recommendations.

Adults: Refer to the BNF for specific dosing recommendations.

Mechanism of action

Amoxicillin exerts its antibacterial effect by binding to penicillin-binding proteins (PBPs) located inside the bacterial cell wall. This binding inhibits the transpeptidation enzyme necessary for cross-linking peptidoglycan layers, ultimately preventing cell wall synthesis and resulting in cell lysis and death.

Pharmacodynamics

The pharmacodynamics of amoxicillin involve its ability to inhibit bacterial growth and replication. It is generally bactericidal, meaning it kills bacteria rather than merely inhibiting their growth. The effectiveness of amoxicillin is influenced by factors such as the type of bacteria, the presence of beta-lactamase enzymes that can inactivate the drug, and the concentration of the antibiotic in relation to the Minimum Inhibitory Concentration (MIC) of the target organism.

Pharmacokinetics

Amoxicillin is well-absorbed from the gastrointestinal tract and reaches peak plasma concentrations within 1 to 2 hours after oral administration. It is widely distributed throughout the body, including in the lungs, kidneys, and middle ear, and can cross the placenta. Approximately 20% of the drug is protein-bound. Amoxicillin is primarily excreted unchanged in the urine, with a half-life of about 1 hour in healthy individuals, which may be prolonged in cases of renal impairment.

Contra-indications

• Hypersensitivity to amoxicillin or other penicillins
• History of severe allergic reactions (e.g. anaphylaxis) to beta-lactam antibiotics

Adverse effects

• Diarrhea
• Nausea
• Vomiting
• Rash
• Allergic reactions (including urticaria and anaphylaxis)
• Hepatotoxicity
• Renal impairment

Interactions

• Probenecid may increase plasma levels of amoxicillin
• Allopurinol may increase the incidence of skin rashes
• Anticoagulants may have increased effects

Precautions

• Use with caution in patients with renal impairment
• Monitor for signs of anaphylaxis in patients with a history of allergies
• Assess liver function regularly in patients on prolonged therapy

Pregnancy

Amoxicillin is generally considered safe to use during pregnancy. It is categorized as pregnancy category B by the FDA, indicating no evidence of risk in human studies.

Breast-feeding

Amoxicillin is excreted in breast milk. While it is generally considered safe for use during breastfeeding, monitoring for any adverse effects in the infant is recommended.

Storage

Store at room temperature, away from moisture and heat. Reconstituted solutions should be refrigerated and used within a specified period as per product guidelines.

Formulations

• Capsules (250 mg, 500 mg)
• Tablets (500 mg, 875 mg)
• Oral suspension (125 mg/5 mL, 250 mg/5 mL)
• Injectable forms (500 mg, 1 g)