Antihistamine

The nasal congestion associated with the common cold and allergic rhinitis is caused by:

• Diphenhydramine

• Histamine

• Collagen

• Bacterial toxins

In the presence of contact allergens, histamine results in:

• local itching

• rhinitis

• infection

• pain

Which of the following is the mechanism of action of loratidine, fexofenadine and cetirizine HCL?

• Block peripheral H1 receptor

• Block central nervous system H1 receptor

• Promote histamine release in the central nervous system

• Promote the production of peripheral histamine

When caring for a client taking antihistamine agents, the nurse should monitor the client for which of the following adverse effects?

• Decreased congestion

• Increased urination

• Increased blood pressure

• Increased bowel action

Antihistamines have a effect on respiratory tract secretions, they should be used with caution in clients with:

• allergic rhinitis

• influenza

• asthma

• pruritus

The nurse is obtaining a client history. Which of the following clients are contraindicated to use antihistamines?

• 10-year-old boy with allergic rhinitis

• 25-year-old with a blood pressure of 110/70mmHg

• 54-year-old woman entering menopause

• 65-year-old man with angle closure glaucoma