A nurse is teaching a client who has pernicious anemia to self-administer nasal cyanocobalamin. Which of the following information should the nurse include in the teaching?

"Use a nasal decongestant 15 minutes before the medication if you have a stuffy nose."

"Administer the medication into one nostril once per week."

"Lie down for 1 hour after administering the medication."

"Plan to self-administer this medication for the next 6 months."