When caring for a client with an upper respiratory infection (URI), the nurse is notified the client is taking guaifenesin (Mucinex). What is the mechanism of action of guaifenesin (Mucinex)?
Stimulate alpha-adrenergic receptors, thus producing vascular constriction of capillaries in nasal mucosa
Compete with histamine for receptor sites, thus preventing a histamine response and overall congestion.
Treat allergic rhinitis and prevent motion sickness.
Loosen bronchial secretion to assist in elimination.
The Correct Answer is D
A. Stimulate alpha-adrenergic receptors, thus producing vascular constriction of capillaries in nasal mucosa: This describes the action of decongestants, not guaifenesin. Guaifenesin does not work by constricting blood vessels; rather, its primary function is to help manage mucus production.
B. Compete with histamine for receptor sites, thus preventing a histamine response and overall congestion: This mechanism is associated with antihistamines, which are used to relieve symptoms of allergic reactions, not with guaifenesin. Guaifenesin does not block histamine but focuses on mucus management.
C. Treat allergic rhinitis and prevent motion sickness: While these are common uses for antihistamines, they do not apply to guaifenesin. Guaifenesin is primarily an expectorant and is not indicated for treating allergic rhinitis or motion sickness.
D. Loosen bronchial secretion to assist in elimination: Guaifenesin acts as an expectorant, promoting the clearance of mucus from the airways by loosening bronchial secretions. This facilitates easier expectoration of mucus, helping to relieve chest congestion associated with upper respiratory infections.
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View Related questions
Correct Answer is A
Explanation
A. Tachycardia: Theophylline can stimulate the heart, leading to an increase in heart rate. Tachycardia is a common adverse effect associated with theophylline use, and it is essential for the client to be aware of this potential side effect, especially if they have underlying heart conditions.
B. Constipation: While gastrointestinal side effects can occur with theophylline, constipation is not a primary or common adverse effect. Theophylline may actually lead to gastrointestinal upset or increased gastric acid production rather than causing constipation.
C. Drowsiness: Theophylline typically does not cause drowsiness. In fact, it is more likely to
cause restlessness or insomnia, as it is a stimulant. Thus, advising the client about drowsiness is not relevant in this case.
D. Oliguria: Oliguria (reduced urine output) is not a common adverse effect of theophylline. Theophylline can affect kidney function indirectly but does not typically present as oliguria. Monitoring for any renal changes is essential, but oliguria is not a primary concern.
Correct Answer is C
Explanation
A) Montelukast (Singulair): This medication is a leukotriene receptor antagonist used to manage asthma and allergic rhinitis. It does not contain soy or soy-derived ingredients, making it a safe option for a client with a soybean allergy. There are no known contraindications related to soy in this medication.
B) Methylprednisolone (Solumedrol): This is a corticosteroid used to reduce inflammation. It is not contraindicated for clients with a soybean allergy, as it does not contain soy-derived components. The medication primarily poses risks related to long-term use, but not specifically regarding soybean allergies.
C) Ipratropium bromide (Atrovent): This medication is an anticholinergic used to relieve bronchospasm. Ipratropium bromide is formulated with soy lecithin, which is derived from soybeans. Therefore, it is contraindicated for clients with a known allergy to soybeans, as it may trigger an allergic reaction.
D) Albuterol (Ventolin): This medication is a short-acting beta-agonist used for quick relief of bronchospasm. It does not contain any soy components and is generally safe for patients with soybean allergies. While there may be other considerations for its use, the allergy to soy is not a concern with this medication.