What medication is anticipated for a client exposed to inhalation anthrax?

Ciprofloxacin is the appropriate medication for a client who has been exposed to inhalation anthrax due to its effectiveness as a broad-spectrum antibiotic belonging to the fluoroquinolone class. Inhalation anthrax, caused by the bacterium Bacillus anthracis, poses a significant risk, and prompt antibiotic treatment is crucial for both prevention and management of the disease.

Ciprofloxacin works by inhibiting bacterial DNA synthesis, which is essential for the growth and reproduction of bacteria. According to guidelines by health authorities, when individuals are exposed to anthrax, particularly through inhalation, ciprofloxacin is recommended for prophylaxis or treatment due to its efficacy against the spores of Bacillus anthracis.

The other options listed do not have a role in treating or preventing inhalation anthrax. Acyclovir is primarily used to treat viral infections, particularly those caused by the herpes virus. Zidovudine is an antiretroviral medication used for treating HIV. Oseltamivir is an antiviral medication used to treat influenza. None of these medications address the bacterial infection caused by inhalation anthrax, highlighting why ciprofloxacin is the correct choice in this context.