When starting antiviral treatment, patients immediately ask: how long does aciclovir 400mg take to work? For most people, aciclovir 400mg effectiveness begins quickly, with the aciclovir onset time showing symptom relief within 1 to 2 days of starting the medication. As a powerful aciclovir antiviral drug, it works by stopping the virus from multiplying. Whether… Continue reading How Long Does Aciclovir 400mg Take to Work? Effectiveness & Onset Time