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Chapter 15: Problem 26

Calculate the following dosages using the medication label or information provided. Label answers correctly: tabs, caps, mL. Answers expressed in milliliters should be rounded to the nearest tenth where indicated. Order: Folic acid \(1,000 \mathrm{mcg}\) IM daily for 10 days. Available: Folic acid \(5,000 \mathrm{mcg}\) per \(\mathrm{mL}\) ________

Short Answer

Expert verified
The dosage is 0.2 mL daily.

Step by step solution

01

Understand the Given Information

The order is for folic acid at a dosage of 1,000 mcg per day via intramuscular (IM) injection, and it should be administered daily for 10 days. The available medication concentration is 5,000 mcg per mL.
02

Calculate Required Dosage per Day

You need to determine how much of the available solution is required to meet the ordered 1,000 mcg dosage. The available concentration is 5,000 mcg/mL, so we have to find the volume (in mL) that will provide the needed 1,000 mcg.
03

Set Up a Proportion

To find the required volume, set up a proportion where 5,000 mcg corresponds to 1 mL, and 1,000 mcg corresponds to an unknown volume (x mL):\[\frac{5,000 \, \text{mcg}}{1 \, \text{mL}} = \frac{1,000 \, \text{mcg}}{x \, \text{mL}}\]
04

Solve the Proportion for x

Cross-multiply and solve for x in the proportion:\[5,000x = 1,000 \times 1\]Thus, \[5,000x = 1,000\] Divide both sides by 5,000 to isolate x:\[x = \frac{1,000}{5,000} = 0.2\]
05

Finalize the Answer

The required dosage to administer daily is 0.2 mL. Since this is already a simple decimal, there is no need for additional rounding steps.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Proportions in Medicine
In medicine, it's essential to use proportions to calculate the correct dosage of medications. Proportions provide a way to relate two ratios, ensuring accurate medication administration. This helps ensure patient safety by dispensing the exact amount of medication required. One important aspect of using proportions in medicine is understanding the relationship between the prescribed dose and the available concentration of a drug. This requires you to set up a proportion that accurately represents these quantities:
  • Identify the available concentration (e.g., 5,000 mcg/mL).
  • Identify the required dosage (e.g., 1,000 mcg).
  • Establish a proportion to solve for the unknown volume required to deliver the prescribed dose.
To solve a proportion, it often involves cross-multiplying to find the unknown value, ensuring the given ratio is maintained.
Intramuscular Injection Dosage
Intramuscular (IM) injections deliver medication directly into a muscle. This route is commonly used for drugs that need to be absorbed quickly or when oral administration is not possible. Calculating the correct dosage for an IM injection involves understanding both the order given by a healthcare provider and the medication's concentration. Here's how to ensure that the right amount is administered:
  • Carefully read the medication order, noting the dosage and frequency (e.g., 1,000 mcg daily).
  • Match this with the concentration of the available drug (e.g., 5,000 mcg/mL).
  • Calculate the required volume of medication (in mL) needed to meet the ordered dose, as precisely demonstrated in the step-by-step solution.
This accuracy is crucial to avoid underdosing or overdosing, which can affect the effectiveness of the medication or cause unwanted side effects.
Milliliters in Medication Administration
In medication administration, measurements are frequently converted into milliliters (mL) to standardize doses, irrespective of the original units. Milliliters are a convenient volume measure because:
  • They provide a clear, standardized way to administer liquid medications.
  • Most syringes and droppers are calibrated in mL, facilitating accurate delivery.
When converting a dosage order to milliliters, it鈥檚 important to:
  • Use the concentration of the medication (e.g., how much mcg or mg is in each mL).
  • Calculate the necessary volume needed to deliver the prescribed dosage.
For instance, as seen in the step-by-step solution, a dosage ordered in micrograms (mcg) was converted into a volume in milliliters for precise administration.
Conversion of Medication Units
Conversion of medication units is a critical skill in ensuring proper dosage. It involves changing the amount of drug from one unit of measure to another, such as from micrograms to milliliters. Understanding how to perform these conversions correctly involves:
  • Knowing the concentration terms, such as mcg/mL, which tell you how much of the drug is in each milliliter.
  • Understanding basic arithmetic to solve for the unknown quantity after setting up a proportion.
  • Rounding correctly when necessary to ensure the dosage is both precise and clinically safe.
For example, converting 1,000 mcg of folic acid required finding the equivalent in mL based on a 5,000 mcg/mL concentration, ultimately resulting in 0.2 mL as the correctly calculated dose through simple proportion manipulation.

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