How does an antihistamine work?
By blocking the effects of histamine in the body
By reducing inflammation in the body
By increasing the production of histamine in the body
By stimulating the immune system
The Correct Answer is A
A) By blocking the effects of histamine in the body:
Antihistamines are pharmacological agents that work by antagonizing the effects of histamine, a chemical mediator released by mast cells and basophils in response to allergens or other triggers. Histamine contributes to various allergic symptoms such as itching, sneezing, nasal congestion, and watery eyes. Antihistamines exert their effects by competitively binding to histamine receptors (specifically H1 receptors) on target cells, thereby preventing histamine from binding and exerting its physiological effects. By blocking histamine receptors, antihistamines inhibit the action of histamine, leading to the alleviation of allergy symptoms.
B) By reducing inflammation in the body:
While some medications, such as corticosteroids, exert anti-inflammatory effects by suppressing the immune response and inhibiting the production of inflammatory mediators, antihistamines primarily target histamine receptors and do not directly reduce inflammation. Although histamine release can contribute to inflammation, antihistamines mitigate allergic symptoms primarily by blocking the action of histamine rather than by directly reducing inflammation.
C) By increasing the production of histamine in the body:
This statement is inaccurate. Antihistamines do not increase the production of histamine; instead, they counteract the effects of histamine by blocking its activity at receptor sites. The primary mechanism of action of antihistamines involves blocking histamine receptors to prevent histamine from exerting its physiological effects.
D) By stimulating the immune system:
Antihistamines do not stimulate the immune system. Instead, they act as antagonists to histamine receptors, thereby inhibiting histamine-induced responses. While histamine is involved in immune responses and allergic reactions, antihistamines do not directly modulate immune function or stimulate immune activity. Their primary role is to alleviate allergy symptoms by blocking the effects of histamine."
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["43.1"]
Explanation
Here's how we can find the dose:
Convert client weight to kilograms (kg):
We know 1 kg = 2.205 pounds.
Client weight (kg) = 95 lbs / 2.205 lb/kg = 43.1 kg (round to one decimal place for accuracy in calculation).
Calculate the enoxaparin dosage per dose:
Prescribed dosage: 1 mg/kg/dose
Client weight (kg): 43.1 kg (rounded value from step 1)
Enoxaparin dose per dose (mg) = Dosage (mg/kg/dose) x Client weight (kg)
Enoxaparin dose per dose (mg) = 1 mg/kg/dose * 43.1 kg = 43.1 mg (round to nearest tenth as requested)
Therefore, the nurse should administer approximately 43.1 mg of enoxaparin per dose.
Correct Answer is A
Explanation
A) "Take the medication with a full glass of water":
This is the correct answer. Docusate is a stool softener used to treat constipation by promoting the incorporation of water into the stool, making it softer and easier to pass. Taking docusate with a full glass of water helps facilitate its action by ensuring hydration and aiding in the softening of stool.
B) "Take this medication on an empty stomach":
Taking docusate on an empty stomach is not necessary. It can be taken with or without food. The primary consideration is to take it with an adequate amount of water to facilitate its stool-softening effect.
C) "Do not take this medication before bedtime":
There is no specific contraindication to taking docusate before bedtime. The timing of administration can vary based on individual preferences and bowel habits. Some individuals may prefer to take it before bedtime to promote a bowel movement in the morning, while others may take it at different times of the day.
D) "Expect abdominal pain with this medication":
Abdominal pain is an uncommon side effect of docusate. While it may occur in some individuals, it is not a common or expected reaction to the medication. Most people tolerate docusate well, but gastrointestinal side effects such as mild abdominal cramping, nausea, or diarrhea may occur in some cases.
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