Aciclovir is indicated for the management of viral infections caused by Herpes simplex virus (HSV type I & II) and Varicella zoster virus, including:
Treatment of herpes simplex infections of the skin and mucous membranes, such as primary and recurrent genital herpes and herpes labialis
Management of herpes zoster (shingles) and chickenpox
Prevention of herpes simplex infections in immunocompromised individuals
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Aciclovir is a synthetic purine nucleoside analogue with selective antiviral activity against HSV and Varicella-zoster virus. Its antiviral action depends on its conversion inside infected cells to Aciclovir triphosphate, the active metabolite.
The initial phosphorylation occurs via virus-encoded thymidine kinase, followed by further phosphorylation by host cellular enzymes. Aciclovir triphosphate inhibits viral DNA synthesis by competitively inhibiting viral DNA polymerase and terminating viral DNA chain elongation, thereby suppressing viral replication.
After oral administration, approximately 15–30% of the dose is absorbed from the gastrointestinal tract, with peak plasma concentrations achieved within 1.5 to 2 hours. Aciclovir is widely distributed throughout body tissues and fluids, including the brain, cerebrospinal fluid, lungs, liver, saliva, vaginal secretions, and herpetic vesicular fluid. The drug is primarily eliminated via the kidneys through glomerular filtration and tubular secretion.
Adults: 200 mg, 5 times daily for 5 days
Adults: 400 mg, 5 times daily for 5 days
Duration may be extended if lesions persist
Dose may be increased to 800 mg, 5 times daily for genital herpes, if required
Under 2 years: Half of the adult dose
Over 2 years: Adult dose
Adults:
200 mg, 4 times daily or
400 mg, twice daily
Dose may be reduced to 200 mg, 2–3 times daily
Treatment should be reviewed and interrupted every 6–12 months
Adults: 200–400 mg, 4 times daily
Children:
Under 2 years: Half of adult dose
Over 2 years: Adult dose
Adults and children >40 kg: 800 mg, 4 times daily for 5 days
Children <40 kg: 20 mg/kg per dose (maximum 800 mg), 4 times daily for 5 days
Children 1 month–2 years: 200 mg, 4 times daily
Children 2–5 years: 400 mg, 4 times daily
Children 6–12 years: 800 mg, 4 times daily
Adults: 800 mg, 5 times daily for 7 days
Adults: 400 mg, 5 times daily for 10 days or until complete clinical resolution
Dose adjustment is recommended in patients with severe renal dysfunction, based on creatinine clearance.
Probenecid may reduce renal excretion of Aciclovir, leading to increased plasma levels and a higher risk of toxicity.
Aciclovir is contraindicated in patients with known hypersensitivity to Aciclovir or any of its components.
Pregnancy Category B
Aciclovir should be used during pregnancy only if the potential benefit outweighs the possible risk to the fetus
Caution is advised when administered to breastfeeding mothers
Use with caution in patients with renal impairment
Dosage adjustment is necessary based on renal function
In neonates, neutrophil counts should be monitored at least twice weekly
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