Calculating the Correct Dosage: A Nurse’s Guide to Preparing an Oral Suspension

QUESTION

Physician orders an oral suspension 186 mg p.oq6h. Powder is to be mixed with 140 mL of water which gives 200 mL of the prescribed suspension with dosage strength of 200 mg/5 mL. To give the prescribed dosage the nurse should measure out?

ANSWER

Calculating the Correct Dosage: A Nurse’s Guide to Preparing an Oral Suspension

Introduction

As a nurse, it is crucial to be proficient in preparing and administering medications accurately to ensure patient safety and therapeutic effectiveness. In this essay, we will discuss the steps involved in calculating and preparing an oral suspension, focusing on a physician’s order for an oral suspension with specific dosage requirements. This case involves a prescription for 186 mg of medication to be taken every 6 hours, using a powder mixed with water to create a suspension with a dosage strength of 200 mg per 5 mL.

Calculating the Correct Dosage

To prepare the prescribed oral suspension with a dosage strength of 200 mg/5 mL and to administer 186 mg of the medication, follow these steps:

Calculate the volume of the 200 mg/5 mL suspension needed to achieve a 186 mg dose.

First, determine how many milligrams (mg) are in 1 mL of the suspension:

200 mg/5 mL = 40 mg/1 mL

Now, calculate the volume required for 186 mg:

Volume (mL) = Dose (mg) / Concentration (mg/mL)

Volume (mL) = 186 mg / 40 mg/mL

Use this formula to determine the volume needed for a 186 mg dose:

Volume (mL) = 4.65 mL

Measure the appropriate amount of powder to mix with 140 mL of water.

Dissolve the powder in 140 mL of water, following the manufacturer’s instructions.

Add the calculated volume of the suspension to the water-powder mixture.

Mix the suspension thoroughly to ensure uniform distribution of the medication.

Administer the prepared oral suspension to the patient using an appropriate dosing syringe or cup, making sure to account for the time interval specified in the physician’s order (every 6 hours, in this case).

Conclusion

Calculating and preparing oral suspensions according to a physician’s order is a fundamental skill for nurses to ensure patients receive the right medication in the correct dosage. In this case, the nurse needed to calculate the volume of a 200 mg/5 mL suspension required to achieve a 186 mg dose and then prepare the suspension by mixing the powder with the appropriate amount of water. By following these steps carefully and accurately, nurses can help ensure that patients receive their prescribed medications safely and effectively, contributing to improved healthcare outcomes.

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