About acyclovir
Antiviral nucleoside analogue
Used for
- Treats shingles and chickenpox
- Treats recurrent genital herpes
- Suppresses frequent herpes outbreaks
Usual adult dose
Shingles: 800 mg five times daily for 7 days. Genital herpes: 200 mg five times daily for 5–10 days; suppression dosing varies.
Usual dose in children
Chickenpox: 20 mg/kg (maximum 800 mg) four times daily for 5 days, for children aged 2 years and older.
Common side effects
- Headache
- Nausea or vomiting
- Diarrhea
- Dizziness
Important warnings
- Kidney problems may require a lower dose; maintain adequate hydration.
- Seek urgent care for confusion, severe rash, or reduced urination.
- Treatment works best when started early; it does not cure herpes.
- Use caution in older adults and people with weakened immunity.
Pregnancy
Generally considered low risk when needed; discuss use with a healthcare professional.
Breastfeeding
Usually compatible; small amounts enter breast milk. Monitor infants for diarrhea or rash.
Interactions
- Probenecid may increase acyclovir levels.
- Other medicines that affect the kidneys may increase kidney-related side effects.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.