What to do if you miss a dose of Acyclovir

Missing a dose of Acyclovir (Acyclovir) is common — most people will skip a dose at some point during a course. The right action depends on how long since the missed dose and whether Acyclovir is taken event-driven or daily at 200mg, 400mg, 800mg. The wrong action — doubling up — is not recommended.

For daily Acyclovir

If Acyclovir is taken daily for a chronic condition, take the missed dose as soon as you remember, unless it is almost time for the next scheduled dose. In that case skip the missed dose and continue normally. According to the prescribing information for Acyclovir, two doses should never be taken close together to "make up" for a miss.

For event-driven Acyclovir

If Acyclovir is used as needed (not on a fixed schedule), there is no "missed dose" in the conventional sense — simply take the planned dose when needed and observe the recommended gap before re-dosing. Acyclovir is a guanosine analogue selectively phosphorylated by viral thymidine kinase to its monophosphate form, then by cellular kinases to acyclovir triphosphate.

Frequently asked questions

Should I double the dose if I missed Acyclovir? ▾

No. Doubling doses of Acyclovir to compensate is not recommended at any 200mg, 400mg, 800mg strength and increases the risk of side effects without improving efficacy. Take the next scheduled dose normally.

How many missed doses are too many? ▾

Occasional missed doses of Acyclovir are usually inconsequential. Repeated missed doses can compromise the therapeutic effect — for chronic conditions like those treated with Antiviral Medications, consistent dosing matters. If adherence is hard, discuss reminders, simpler schedules or alternative formulations with the prescriber.

More on Acyclovir

The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.