A nurse is teaching a patient about the use of sildenafil [Viagra] for erectile dysfunction. Which statement by the patient indicates understanding of the teaching?
"This drug may cause me to have an erection when I don't want one."
"If my erection lasts longer than 6 hours, I should contact my provider."
"If I have chest pain with sildenafil, I can use my nitroglycerin as prescribed."
"I should take this drug 5 minutes before sexual activity."
The Correct Answer is B
A. While sildenafil can cause erections, it does not typically lead to unwanted erections; it requires sexual stimulation to be effective.
B. An erection lasting longer than 6 hours, known as priapism, is a serious side effect and requires immediate medical attention, indicating the patient understands this risk.
C. Using nitroglycerin with sildenafil can lead to dangerous drops in blood pressure, and patients should be advised to avoid this combination.
D. Sildenafil should be taken about 30 minutes to 1 hour before sexual activity for best results, not just 5 minutes prior.
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Correct Answer is D
Explanation
A. Epinephrine is primarily used for anaphylaxis and severe asthma attacks; it is not effective in reversing opioid overdose.
B. Protamine is an antidote for heparin, not for opioid overdose.
C. Flumazenil is a benzodiazepine antagonist and is not indicated for opioid overdose; it can potentially precipitate seizures in patients with mixed drug overdoses.
D. Naloxone is an opioid antagonist specifically indicated for reversing the effects of opioid overdose, including respiratory depression, making it the appropriate choice in this scenario.
Correct Answer is A
Explanation
A. Diphenhydramine is an H1 antihistamine that works by blocking the effects of histamine at H1 receptor sites, thus alleviating allergy symptoms.
B. H2 receptor sites are primarily involved in gastric acid secretion, and diphenhydramine does not affect these receptors.
C. Diphenhydramine does not stimulate histamine effects; it blocks them instead.
D. The medication does not occupy all H receptor sites; it specifically targets H1 receptors to exert its effects.