The prescription reads for guaifenesin 400 mg PO every 4 hours as needed for congestion. Using the label below, how many mL will the nurse administer to the client? Enter a numeric value only. Answer to the nearest whole mL.
The Correct Answer is ["20"]
1. Determine the concentration of the guaifenesin:
The label states 100 mg/5 mL.
2. Set up a proportion to find the volume (in mL) needed:
100 mg / 5 mL = 400 mg / x mL
3. Solve for x:
Cross-multiply: 100x = 400 * 5
100x = 2000
x = 2000 / 100
x = 20 mL
Answer: The nurse will administer 20 mL to the client.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
To determine if the client's dose is safe and therapeutic, we need to calculate the appropriate dosing range based on the client's weight and compare it with the ordered dose.
Client's weight: 45 kg
Ordered dose: 500 mg every 8 hours, which equals 1500 mg/day (500 mg × 3 doses).
Calculate the therapeutic range:
The dosing range in the Davis Drug Guide is 20 to 40 mg/kg/day. So, for this client, based on their weight of 45 kg:
Minimum dose: 20 mg × 45 kg = 900 mg/day
Maximum dose: 40 mg × 45 kg = 1800 mg/day
The ordered dose of 1500 mg/day falls within this range (900 mg/day to 1800 mg/day), which means it is safe and therapeutic for the client.
Correct Answer is D
Explanation
A) The ammonia level has decreased each day starting the lactulose: While a decrease in ammonia levels is an important indicator of improvement in hepatic encephalopathy, it is not the best assessment of the therapeutic response to lactulose. The goal of lactulose therapy is to reduce ammonia levels, but the most direct evaluation of therapeutic effect is related to the client's mental status, not just laboratory results.
B) The liver enzymes AST and ALT have decreased to normal levels: Liver enzyme levels such as AST (aspartate aminotransferase) and ALT (alanine aminotransferase) are important indicators of liver function, but they do not directly reflect the effectiveness of lactulose in treating hepatic encephalopathy. These enzymes may improve as liver function improves, but they are not the most immediate or specific indicator of lactulose’s therapeutic effect.
C) The client is having 5-6 soft, non-formed stools each day: Lactulose works by drawing water into the bowel to promote stool softening and increase bowel movements, which can help lower ammonia levels in the body. While frequent soft stools can be an effect of lactulose, this is not the best measure of therapeutic response in hepatic encephalopathy. The primary goal is improvement in the client's mental status, not just bowel function.
D) The client is awake, alert, and oriented to their environment: The best assessment of the therapeutic response to lactulose is the improvement in the client’s mental status. Lactulose works by reducing the absorption of ammonia from the gastrointestinal tract, which is responsible for the cognitive impairments seen in hepatic encephalopathy. If the client is awake, alert, and oriented, this indicates that lactulose is effectively reducing the ammonia levels and improving the neurological status of the client, making it the most appropriate assessment.
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