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.

Expectorants are medications that help thin and loosen mucus in the respiratory tract, making it easier to cough up and clear from the airways. Increasing fluid intake, particularly water helps to keep the mucus thin and less sticky, facilitating its removal. Adequate hydration can help promote effective expectoration and relieve congestion.

The other options are incorrect because:

B. Taking the medication once a day only, usually at bedtime: The dosing frequency and timing of expectorants can vary depending on the specific medication prescribed. It is important to follow the healthcare provider's instructions regarding the dosing schedule.

C. Increase fiber and fluid intake to prevent constipation: This instruction is unrelated to expectorant use. Increasing fiber and fluid intake is commonly recommended to promote regular bowel movements and prevent constipation, but it is not directly related to expectorant therapy.

D. Restrict fluids to decrease mucus production: Restricting fluids can lead to dehydration and thickening of mucus secretions. It is important to stay adequately hydrated to maintain thin and easily expectorated mucus. Restricting fluids is not recommended for managing mucus production.

Montelukast is typically prescribed as a once-daily medication for the treatment of asthma. Taking it in the evening can be beneficial as it helps to control asthma symptoms throughout the day and night. It is important to follow the prescribed dosing schedule provided by the healthcare provider.

The other statements mentioned are incorrect:
A. "I'll rinse my mouth after taking this medication": Rinsing the mouth after taking montelukast is not necessary as it is not an inhaled medication. Rinsing the mouth is typically recommended after using inhaled corticosteroids to reduce the risk of oral thrush.

B. "I'll take this medication when I get an asthma attack": Montelukast is a long-term control medication used to prevent asthma attacks and manage chronic asthma symptoms. It is not intended for immediate relief during an asthma attack.

C. "I use a spacer device when I inhale this medication": Montelukast is not an inhaled medication, so the use of a spacer device is not applicable. Spacer devices are commonly used with inhaled medications to improve the delivery of the medication to the lungs.