Nucleoside antiviral prodrug
What to do if you miss a dose of Valacyclovir
Missing a dose of Valacyclovir (Valacyclovir) 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 Valacyclovir is taken event-driven or daily at 500mg, 1000mg. The wrong action — doubling up — is not recommended.
For daily Valacyclovir
If Valacyclovir 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 Valacyclovir, two doses should never be taken close together to "make up" for a miss.
For event-driven Valacyclovir
If Valacyclovir 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. Valacyclovir is rapidly and almost completely converted to acyclovir during first-pass intestinal and hepatic metabolism by valacyclovir hydrolase.
Frequently asked questions
Should I double the dose if I missed Valacyclovir? ▾
No. Doubling doses of Valacyclovir to compensate is not recommended at any 500mg, 1000mg 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 Valacyclovir are usually inconsequential. Repeated missed doses can compromise the therapeutic effect — for chronic conditions like those treated with Nucleoside antiviral prodrug, consistent dosing matters. If adherence is hard, discuss reminders, simpler schedules or alternative formulations with the prescriber.
Products containing Valacyclovir
More on Valacyclovir
- With alcoholValacyclovir and alcohol — is it safe to drink?
- With foodShould Valacyclovir be taken with food?
- Side effectsValacyclovir side effects: common, rare and warning signs
- Dosage guideValacyclovir dosage guide: how much to take and when
- OnsetHow fast does Valacyclovir start working?
- DurationHow long does Valacyclovir last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.