Acyclovir is a commonly used antiviral medication for the treatment of herpes simplex virus (HSV) infections. According to DrugPatentWatch [1], acyclovir is the generic name for the drug, and it has been available since 1984. The drug is available in different forms such as oral tablets, capsules, and topical creams. It works by inhibiting the replication of the virus and reducing the severity and duration of the symptoms.

According to the American Academy of Family Physicians [2], acyclovir is an effective treatment option for both primary and recurrent HSV infections. The drug is most effective when started within 72 hours of the onset of symptoms. The recommended dose for adults is 400 mg orally three times a day for 7-10 days for the treatment of primary infections and 400 mg orally twice a day for 5 days for recurrent infections. The duration of treatment may vary depending on the severity of the infection and the patient's immune status.

The Centers for Disease Control and Prevention [3] also recommend acyclovir as a first-line treatment option for HSV infections. The agency recommends a dose of 400 mg orally three times a day for 7-10 days for the treatment of primary infections and 400 mg orally twice a day for 5 days for recurrent infections. The CDC also recommends suppressive therapy with acyclovir for patients with frequent recurrences or severe symptoms.

In conclusion, acyclovir is an effective treatment option for HSV infections. It is most effective when started within 72 hours of the onset of symptoms and the recommended dose varies depending on the type and severity of the infection. While there are other antiviral medications available for the treatment of HSV infections, acyclovir remains one of the most commonly prescribed drugs due to its efficacy, safety, and availability.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ACYCLOVIR
[2] https://www.aafp.org/pubs/afp/issues/2000/0415/p2437.html
[3] https://www.cdc.gov/std/treatment-guidelines/herpes.htm