A 24-year-old woman presents with dysuria, fever, malaise, and genital lesions including multiple clear vesicles and tender inguinal adenopathy. The most appropriate initial treatment is?

• A. Valacyclovir (Valtrex)
• B. Metronidazole (Flagyl)
• C. Ceftriaxone (Rocephin)
• D. Benzathine penicillin G (Bicillin)

Answer: (A)

Recognizing an acute genital herpes infection is the key idea here. When a young woman presents with dysuria, fever, malaise, and genital lesions described as vesicles with tender inguinal adenopathy, primary herpes simplex virus infection is highly likely. In primary HSV, systemic symptoms and grouped vesicular lesions are common, and starting antiviral therapy promptly helps shorten the illness and reduce viral shedding.

The most appropriate initial treatment is an antiviral medication. Valacyclovir is chosen because it delivers convenient, effective suppression of HSV replication, leading to faster symptom resolution and decreased risk of transmitting the virus to others. For a first episode, an oral antiviral regimen given for about 7 to 10 days is standard, with valacyclovir typically dosed to achieve a strong antiviral effect.

Why the other options aren’t appropriate here: metronidazole targets anaerobic bacteria and some parasites, not viruses, so it won’t help an HSV infection. Ceftriaxone would treat gonorrhea or, in some cases, other bacterial pelvic infections, but HSV is viral. Benzathine penicillin G treats syphilis, not herpes. In the presence of classic HSV symptoms, there’s no antibiotic therapy that cures the infection, so starting an antiviral is the correct approach.

Starting antiviral therapy now also aligns with the usual practice of treating suspected HSV promptly, even before confirmatory tests (such as PCR of vesicle fluid) return, to reduce symptoms and viral shedding and to aid in faster recovery.