Once in the body, the virus tracks in the nerves of the corresponding infected area and is placed in the nerve nodes, where it remains "dormant".

The active substance in Acyclostad is aciclovir. Acyclostad is used to treat cold sores on the lips and face at the itching, burning or blistering stage. Clinical studies have shown that early treatment with this medicine stops the formation of herpes. If herpes has already appeared, treatment with this medicine will speed up its healing.