A client presents to the ed reporting anxiety and chest pain after shoveling heavy snow that morning. the client says that nitroglycerin has not been taken for months but upon experieincing this chest pain did take three nitroglycerin tablets. although the pain has lessened, the client states, "they did not work all that well." the client shows the nurse the nitroglycerin bottle; the prescription was filled 12 months ago. the nurse anticipates which order by the physician?