A client receives a prescription for penicillin 1.2 million units IM. The available vial is labeled, “600,000 units/mL.” How many mL should the nurse administer? (Enter numeric value only.)

Choice A reason:

Performing a bladder scan is useful for assessing urinary retention, which can be a symptom of benign prostatic hyperplasia (BPH). However, it is not the primary method for monitoring adverse reactions to tamsulosin. Tamsulosin is an alpha-1 blocker that relaxes the muscles in the prostate and bladder neck, improving urine flow. While it can help reduce urinary retention, the primary concern with tamsulosin is its effect on blood pressure.

Choice B reason:

Monitoring blood pressure is crucial because tamsulosin can cause orthostatic hypotension, a condition where blood pressure drops significantly when a person stands up from a sitting or lying position. This can lead to dizziness, lightheadedness, and even fainting. Regular monitoring of blood pressure helps detect and manage this potential adverse reaction, ensuring the client’s safety.

Choice C reason:

Obtaining daily weights is important for monitoring fluid balance and detecting conditions like heart failure or kidney disease. However, it is not directly related to the adverse reactions of tamsulosin. The primary concern with tamsulosin is its impact on blood pressure, not fluid retention.

Choice D reason:

Assessing urine output is important for evaluating the effectiveness of tamsulosin in relieving urinary symptoms associated with BPH. However, it is not the primary method for monitoring adverse reactions. The main adverse reaction to be aware of with tamsulosin is its potential to cause orthostatic hypotension, making blood pressure monitoring the priority.

Step-by-Step Calculation

Step 1: Determine the total amount of magnesium sulfate in the IV bag.

• The IV bag contains 4 grams of magnesium sulfate.

Step 2: Convert grams to milligrams.

• 4 grams × 1000 mg/gram = 4000 mg

Result: The IV bag contains 4000 mg of magnesium sulfate.

Step 3: Determine the concentration of magnesium sulfate in the IV bag.

• Concentration = Total amount of magnesium sulfate ÷ Total volume of the IV bag
• Concentration = 4000 mg ÷ 500 mL

Result: The concentration is 8 mg/mL.

Step 4: Calculate the infusion rate.

• Infusion rate = Prescribed dose ÷ Concentration
• Infusion rate = 300 mg/hour ÷ 8 mg/mL

Result: The infusion rate is 37.5 mL/hour.