An order is for trimethoprim-sulfamethoxazole 120 mg BID, and the label shows 200 mg/5 ml. How many ml should the nurse administer per dose?

An order is for trimethoprim-sulfamethoxazole 120 mg BID, and the label shows 200 mg/5 ml. How many ml should the nurse administer per dose?

• A. 2 ml
• B. 3 ml
• C. 4 ml
• D. 5 ml

Answer: (B)

To determine the correct volume in milliliters to administer, it's essential to start by understanding the medication concentration and the required dose. The order is for trimethoprim-sulfamethoxazole 120 mg per dose. The label indicates a concentration of 200 mg per 5 ml. This means that in every 5 ml of the solution, there are 200 mg of the medication. To find out how many milliliters are needed to obtain a 120 mg dose, we can set up a proportion based on the concentration provided: 1. We know that 200 mg is contained in 5 ml. 2. We need to find out how much volume (X in ml) would contain 120 mg. Using the equation: \[ \frac{200 \, \text{mg}}{5 \, \text{ml}} = \frac{120 \, \text{mg}}{X \, \text{ml}} \] Now, cross-multiplying gives us: \[ 200 \, \text{mg} \times X \, \text{ml} = 120 \, \text{mg} \times 5 \, \text{ml} \] \[

To determine the correct volume in milliliters to administer, it's essential to start by understanding the medication concentration and the required dose. The order is for trimethoprim-sulfamethoxazole 120 mg per dose.

The label indicates a concentration of 200 mg per 5 ml. This means that in every 5 ml of the solution, there are 200 mg of the medication. To find out how many milliliters are needed to obtain a 120 mg dose, we can set up a proportion based on the concentration provided:

1. We know that 200 mg is contained in 5 ml.

2. We need to find out how much volume (X in ml) would contain 120 mg.

Using the equation:

[

\frac{200 , \text{mg}}{5 , \text{ml}} = \frac{120 , \text{mg}}{X , \text{ml}}

]

Now, cross-multiplying gives us:

[

200 , \text{mg} \times X , \text{ml} = 120 , \text{mg} \times 5 , \text{ml}

]

[