A client frequently takes diphenhydramine (Benadryl) to alleviate his upper respiratory symptoms associated with allergies. Which of the following mechanism of actions applies to diphenhydramine (Benadryl)?
stimulates effects of histamine by occupying all H receptor sites.
blocks effects of histamine by competing and occupying H1 receptor sites.
blocks effects of histamine by competing and occupying H2 receptor sites.
stimulates effects of histamine by increasing amount of H2 receptor sites.
The Correct Answer is B
A. Stimulates effects of histamine by occupying all H receptor sites: This statement inaccurately describes the action of diphenhydramine. Instead of stimulating histamine effects, diphenhydramine actually blocks them, particularly at H1 receptors, which are involved in allergic responses.
B. Blocks effects of histamine by competing and occupying H1 receptor sites: This accurately describes the mechanism of action of diphenhydramine. As an antihistamine, it competes with histamine for binding to H1 receptor sites, effectively reducing symptoms of allergies, such as sneezing, itching, and nasal congestion.
C. Blocks effects of histamine by competing and occupying H2 receptor sites: This option is incorrect because H2 receptor antagonists are used primarily to reduce gastric acid secretion, not to treat allergic reactions. Diphenhydramine specifically targets H1 receptors, not H2 receptors.
D. Stimulates effects of histamine by increasing the amount of H2 receptor sites: This statement is also incorrect. Diphenhydramine does not stimulate histamine activity or increase receptor sites. Instead, it functions to inhibit the action of histamine at H1 receptors, which is fundamental in alleviating allergy symptoms.
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Correct Answer is A
Explanation
A. "Make sure to use this each time I feel an asthma attack coming on": This statement indicates a need for further education. LABAs are not intended for immediate relief of acute asthma symptoms or attacks; they are designed for long-term control and prevention of symptoms. Clients should use a short-acting beta agonist (SABA) for quick relief during an asthma attack, not a LABA.
B. "I know that these drugs can sometimes make my heart beat faster": This statement reflects an understanding of a potential side effect of LABAs. Increased heart rate is a known side effect, and it is important for clients to be aware of this possibility.
C. "I've heard that this drug sometimes gets less effective over time": This statement is accurate. Tolerance can develop with LABA use, and clients should be informed about this possibility to monitor their symptoms and report any changes to their healthcare provider.
D. "I've heard that this drug is particularly good at preventing asthma attacks during exercise": This statement is correct. LABAs can be beneficial for preventing exercise-induced bronchospasm when used as part of a regular asthma management plan, and clients should understand this use.
Correct Answer is B
Explanation
A. Hypertension: Fluticasone, a corticosteroid, is not typically associated with causing hypertension directly. However, chronic use can lead to fluid retention and hypertension in some individuals, but it is not a primary concern compared to other side effects.
B. Fungal infections: This is a significant adverse effect associated with inhaled corticosteroids like fluticasone. Prolonged use can increase the risk of oral thrush and other fungal infections due to the immunosuppressive effects of corticosteroids. Monitoring for signs of infection is crucial.
C. Decreased immunity: While long-term use of systemic corticosteroids can lead to decreased immune function, inhaled fluticasone is less likely to cause significant immunosuppression. However, it can still impact local immunity in the airways, making monitoring for infections more relevant than generalized immune suppression.
D. Hypoglycemia: Fluticasone is not known to cause hypoglycemia. In fact, corticosteroids typically can lead to increased blood glucose levels rather than lowering them, especially with chronic use, making this option inaccurate in the context of monitoring for adverse effects.