Fluticasone (Flonase) a nasal glucocorticoid has been prescribed for a client with allergic rhinitis. The nurse teaches the client which is the most common side effect of continuous use.

The correct answer is A: Dry nasal mucosa and nosebleeds. Fluticasone is a nasal glucocorticoid that can cause local side effects such as dryness and irritation of the nasal mucosa, leading to nosebleeds. This is due to the anti-inflammatory properties of glucocorticoids, which can thin the nasal mucosa with prolonged use. Rhinorrhea (choice B) is actually a symptom of allergic rhinitis that Fluticasone aims to treat. Dizziness (choice C) and hallucinations (choice D) are not common side effects of nasal glucocorticoid use. Therefore, the correct answer is A based on the expected pharmacological effects of Fluticasone.