What is a common treatment for herpes zoster when initiated within 72 hours?

Acyclovir is a common treatment for herpes zoster, especially when initiated within 72 hours of the onset of the rash. This antiviral medication is effective in reducing the duration and severity of the symptoms associated with shingles (herpes zoster). It works by inhibiting viral replication, which can help alleviate pain, reduce the risk of complications such as postherpetic neuralgia, and shorten the duration of the illness.

Starting treatment within the first 72 hours is crucial because earlier intervention is associated with better clinical outcomes. When given promptly, acyclovir not only expedites recovery but also helps to prevent the spread of the varicella-zoster virus, which causes the infection.

Other medications listed, such as amoxicillin, metronidazole, and azithromycin, are antibiotics or different types of antimicrobials that do not address viral infections like herpes zoster and would not provide the necessary treatment for this condition. Thus, they are not appropriate choices for managing herpes zoster, underscoring acyclovir's specific role as the correct therapeutic option in this scenario.