A patient is prescribed 20 g of lactulose to be administered via gastric tube. If lactulose is available at 10 g/15 mL, what volume should be given?

To determine the correct volume of lactulose to administer, you first need to understand the concentration of the drug available. In this case, lactulose is provided at a strength of 10 grams per 15 milliliters.

You need to give a total of 20 grams to the patient. To find out how many milliliters will deliver the required 20 grams, start by identifying how many grams there are in 1 milliliter based on the concentration:

10 grams is contained in 15 milliliters, so to find the amount per milliliter, divide 10 grams by 15 mL. This results in approximately 0.67 grams per milliliter.

Next, to find out how many milliliters are needed for 20 grams, you can set up a proportion or perform a calculation. Since 10 grams is found in 15 milliliters, you can double this volume to get to 20 grams:

• For 10 grams = 15 mL

• For 20 grams = 30 mL

Thus, to administer 20 grams of lactulose, you will need to give 30 mL. This aligns with the given volume options, confirming that 30 mL