Can Acyclovir Be Used Prophylactically?

Some clinical trials have reported on the use of acyclovir prophylaxis to decrease the incidence of herpes zoster. However, the appropriate acyclovir dose and duration of prophylaxis remain unclear.

Can I take acyclovir as a preventative?

For prevention of recurrent outbreaks of genital herpes infections: Adults and children 12 years of age and older—200 to 400 mg two to five times a day for five days or up to twelve months, depending on how often your outbreaks of infection occur.

Can you take acyclovir prophylactically for cold sores?

To prevent cold sores, valacyclovir or another antiviral drug, acyclovir (Zovirax), can be taken daily. This reduces the chance of a cold sore coming back by about one-third. It could also help if you avoid triggers, such as exposure to sun or wind, that can activate the cold sore virus.