Acyclovir dosage guide: how much to take and when
Choosing the right dose of Acyclovir (Acyclovir) is the most important practical decision after starting therapy. Acyclovir is supplied as tablet, capsule, oral suspension, topical cream in 200mg, 400mg, 800mg, and the right dose for a given person depends on the indication, age, comorbidities and tolerance to the active ingredient Acyclovir.
Starting dose and titration
According to the prescribing information, most adults begin Acyclovir at the lowest available strength of 200mg, 400mg, 800mg and titrate up only if symptom control is insufficient and tolerability is good. Higher doses are reserved for selected cases. Older adults, people with renal or hepatic impairment, and those taking interacting medications should usually start at the lowest dose.
When to adjust
Dose adjustment is guided by symptom response and side effect burden, not by arbitrary schedules. Acyclovir is a guanosine analogue selectively phosphorylated by viral thymidine kinase to its monophosphate form, then by cellular kinases to acyclovir triphosphate. If side effects are limiting at a given dose, going down a step is usually preferred over stopping abruptly. If the response is incomplete after several weeks, a higher dose can be tried under medical supervision.
Frequently asked questions
What is the standard starting dose of Acyclovir? ▾
Most adults start Acyclovir at the lowest strength of 200mg, 400mg, 800mg, with adjustment based on symptom response and tolerance. Older adults and those with reduced kidney or liver function generally start lower. The prescriber decides the exact starting dose for each person.
Can I take a higher dose of Acyclovir if it isn't working? ▾
Higher doses of Acyclovir should only be used after consulting the prescriber. Doubling on your own is unsafe, especially with active ingredients in the Antiviral Medications class. The prescriber can confirm whether titration is appropriate or whether the medication needs to be changed.
More on Acyclovir
- With alcoholAcyclovir and alcohol — is it safe to drink?
- With foodShould Acyclovir be taken with food?
- Side effectsAcyclovir side effects: common, rare and warning signs
- OnsetHow fast does Acyclovir start working?
- DurationHow long does Acyclovir last?
- Missed doseWhat to do if you miss a dose of Acyclovir
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.