Using dimensional analysis, calculate the dose to be administered in mililiters. Available 125 mg per 5 mL. Ordered: phenytoin (Dilantin) 200 mg. ________ mL

To calculate the required dose using dimensional analysis, we can follow these steps:

### Step 1: Identify the known values
- **Available concentration**: 125 mg per 5 mL
- **Ordered dose**: 200 mg

### Step 2: Set up the dimensional analysis formula

We want to convert 200 mg of the drug into milliliters, using the known concentration (125 mg/5 mL).

\[
\text{Dose to administer (mL)} = \left( \frac{200 \, \text{mg}}{1} \right) \times \left( \frac{5 \, \text{mL}}{125 \, \text{mg}} \right)
\]

### Step 3: Perform the calculation

\[
\text{Dose to administer (mL)} = \frac{200 \times 5}{125} = \frac{1000}{125} = 8 \, \text{mL}
\]

### Final Answer:
The dose to be administered is **8 mL**.

Would you like any more details or clarifications? 

Here are 5 related questions for further practice:
1. What would the dose be if the ordered amount was 250 mg?
2. How would the dose change if the available concentration were 150 mg per 5 mL?
3. If the available drug is 125 mg per 10 mL, how much would you administer for a 200 mg dose?
4. How would you convert a dose ordered in grams to milliliters?
5. What is the importance of verifying the concentration before administering a dose?

**Tip**: Always check both the ordered dose and the available concentration before calculating and administering medication.

Using dimensional analysis, calculate the dose to be administered in milliliters. Available 125 mg per 5 mL. Ordered: phenytoin (Dilantin) 200 mg. ________ mL

Learn how to calculate the correct dose of Phenytoin (Dilantin) using dimensional analysis. This example walks you through converting a 200 mg dose into milliliters based on a concentration of 125 mg per 5 mL. A detailed step-by-step solution is provided for pharmacy and nursing students.

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