BNF Aciclovir Dosing and Administration Guidelines
Standard Dosing for Cold Sores
According to BNF guidelines, aciclovir 400mg tablets should typically be taken five times daily for five days when treating cold sores. The first dose should be taken as soon as tingling or early symptoms appear, ideally within 24 hours of onset. EverydayMeds stocks aciclovir 400mg tablets for those requiring prescription treatment for recurrent cold sores.
Timing and Frequency Guidelines
Aciclovir works best when blood levels remain consistent. Space doses approximately every four hours during waking hours, with the final dose before bedtime. The BNF recommends taking aciclovir with a full glass of water and maintaining adequate fluid intake throughout treatment. For topical aciclovir cream, apply five times daily to affected areas, starting at the first sign of symptoms.
Special Considerations
Patients with kidney problems may require dose adjustments as outlined in BNF guidance. Elderly patients should be monitored more closely during treatment. Aciclovir tablets can be taken with or without food, though taking with food may help reduce stomach upset. EverydayMeds also offers valaciclovir tablets as an alternative antiviral option requiring less frequent dosing.
Treatment Duration and Effectiveness
The standard BNF-recommended course for cold sores is five days, though some patients may benefit from longer treatment. Early treatment initiation significantly improves outcomes - starting within the first 24 hours of symptoms may reduce outbreak duration by 1-2 days. Never stop treatment early even if symptoms improve, as this could lead to incomplete viral suppression.
Safety and Side Effects
Common side effects include nausea, headache, and dizziness. Rare but serious effects include kidney problems and neurological symptoms. The BNF emphasises the importance of adequate hydration during oral aciclovir therapy. Contact your healthcare provider if you experience unusual symptoms or if cold sores worsen during treatment.
