Problem 39 - Calculate With Confidence

Question

Calculate the dosages to be given. Use labels where provided. Order: Azidothymidine \(7 \mathrm{mg}\) p.o. qoh. Available: Azidothymidine \(10 \mathrm{mg}\) per mL

Step-by-Step Solution

Answer

Administer 0.7 mL of Azidothymidine each hour.

Step 1: Understand the Order

The order is for Azidothymidine, and the dosage is specified as 7 mg to be given orally (p.o.) every hour (qoh). This means that the patient needs to receive 7 mg of Azidothymidine each hour.

Step 2: Determine the Concentration

The available concentration of Azidothymidine is 10 mg per mL, meaning each mL of solution contains 10 mg of the medication.

Step 3: Set Up the Dosage Calculation

To find out how many mL are needed for a 7 mg dose, we use the formula: \[ \text{Dose required} = (\text{Dose ordered}) \times \left( \frac{\text{Volume available}}{\text{Concentration available}} \right) \] Here, Volume available is expressed in mL, and Concentration available in mg/mL.

Step 4: Calculate the Required Volume

Using the formula, we substitute the values: \[ \text{Required Volume} = 7 \, \mathrm{mg} \times \left( \frac{1 \, \mathrm{mL}}{10 \, \mathrm{mg}} \right) = 0.7 \, \mathrm{mL} \] Thus, 0.7 mL of Azidothymidine needs to be administered per dose.

Key Concepts

Medication administration

Medication administration refers to the process of giving drugs to a patient according to a healthcare provider's order. It involves understanding the medication order, preparing the correct dosage, and ensuring that the patient receives the medication via the correct route. In this scenario, the order is for the medication Azidothymidine, to be given orally every hour. Oral administration is common and involves swallowing the medication.

• Ensure the correct patient is receiving the medication.
• Verify the medication and dosage against the doctor's order.
• Adhere to the specific timing for administering the medication (every hour in this case).

Medication administration requires meticulous attention to detail to prevent errors and ensure patient safety. It involves the five "rights": right patient, right drug, right dose, right route, and right time.

Pharmaceutical calculations

Pharmaceutical calculations are essential to ensure that patients receive the correct amount of medication. These calculations help convert medical orders into measurable quantities. Here, the calculation involves determining how much of a liquid solution is needed to provide a specific dose. These calculations often entail:

• Understanding dosage orders and converting orders into an actionable plan.
• Using proportions and formulas to determine the amount of medication required.
• Checking calculations multiple times to avoid errors.

In the example exercise, we have calculated the required volume of a medication to ensure that the correct dose is given each hour. Accurate pharmaceutical calculations are vital in preventing underdosing or overdosing and maintaining patient safety.

Oral dosage

Oral dosage refers to the administration of medication through the mouth, which involves either swallowing pills, liquids, or other forms of medication. One key advantage of oral dosing is its simplicity and non-invasiveness. It allows medications to be absorbed through the gastrointestinal tract.

• Consider the patient’s ability to swallow and their gastrointestinal function.
• Ensure the medication is given with the right amount of liquid if required.
• Check if the medication needs to be taken with or without food.

In this exercise, Azidothymidine is to be given orally. The patient's individual needs and any specific instructions should be considered to optimize absorption and effectiveness.

Mathematical conversions in healthcare

Mathematical conversions in healthcare are critical for translating medication orders into the proper dosage forms for administration. These conversions often involve changing measurements, such as from milligrams to milliliters, depending on the medication format and concentration. Key points include:

• Familiarity with common measurement systems like metric and imperial.
• Using conversion factors accurately to change from one unit to another.
• Careful calculations to prevent conversion errors that could lead to dosing mistakes.

In the presented exercise, a conversion from milligrams to milliliters was necessary to decide how much liquid form of Azidothymidine to administer. Solid understanding of these conversions ensures that healthcare professionals can confidently and correctly provide medications, contributing to overall patient safety and effective treatment.