Clarithromycin Suspension

Clarithromycin Suspension
Usage
Clarithromycin suspension is an oral liquid formulation of a macrolide antibiotic used to treat a range of bacterial infections caused by susceptible organisms. It is particularly useful for paediatric patients or individuals who have difficulty swallowing tablets.
It may be prescribed for:
• Respiratory tract infections (e.g., bronchitis, pneumonia, sinusitis)
• Ear infections (otitis media)
• Skin and soft tissue infections
• Throat infections (e.g., pharyngitis, tonsillitis)
• Helicobacter pylori eradication regimens (in combination with other medicines)

Dosage
Dosage should be determined by the prescribing practitioner based on the patient’s age, weight, infection type, and severity.
Typical dosing considerations include:
• Usually administered twice daily, depending on the indication
• In paediatric patients, dosing is typically calculated based on body weight (mg/kg/day)
• The suspension should be shaken well before use
• May be taken with or without food, although taking with food may improve tolerability
• Treatment duration varies depending on the infection and clinical response
Patients should complete the full course of therapy as prescribed.

Mechanisms of Action
Clarithromycin is a macrolide antibiotic that inhibits bacterial protein synthesis.
Its mechanisms include:
Binding to the 50S ribosomal subunit
Clarithromycin binds to bacterial ribosomes, interfering with protein synthesis.
Inhibition of bacterial growth
By preventing the production of essential proteins, it inhibits bacterial growth and replication.
Bacteriostatic and bactericidal effects
Depending on concentration and organism, clarithromycin may exert bacteriostatic or bactericidal activity.

Contraindications
Clarithromycin should not be used in patients with:
• Hypersensitivity to clarithromycin, erythromycin, or other macrolide antibiotics
• Concurrent use of medicines that are contraindicated due to serious interactions (e.g., certain drugs that prolong QT interval or are metabolised by CYP3A4)
• History of clarithromycin-associated cholestatic jaundice or hepatic dysfunction

Precautions
Clarithromycin should be used with caution in patients with:
• Hepatic impairment
• Renal impairment, where dose adjustment may be required
• Cardiac conditions, particularly QT prolongation or arrhythmias
• Electrolyte disturbances (e.g., low potassium or magnesium)
Additional considerations include:
• Clarithromycin may interact with a wide range of medications via CYP3A4 inhibition
• Monitor for signs of liver dysfunction, such as jaundice or abnormal liver tests
• Use of antibiotics should be appropriate to reduce the risk of antimicrobial resistance
• Patients should seek medical advice if they experience severe diarrhoea, palpitations, or allergic reactions

Storage
• Store below 25°C unless otherwise directed
• Keep the suspension in a tightly closed container
• Shake well before use
• Protect from heat, moisture, and direct light
• Reconstituted suspensions may have a limited shelf life (e.g., 7–14 days)
• Keep out of reach of children and pets
Patients should follow the specific storage and expiry instructions provided on the dispensing label supplied by the pharmacy.