Synthroid 0.3 mg p.o. daily is ordered. You have Synthroid in 150 mcg tablets. Give tablets.
The Correct Answer and Explanation is:
To determine how many Synthroid tablets to administer, follow these steps:
- Convert the ordered dose to micrograms (mcg):
- The ordered dose is 0.3 mg.
- Since 1 mg = 1000 mcg, 0.3 mg is equivalent to: 0.3 mg×1000 mcg/mg=300 mcg0.3 \text{ mg} \times 1000 \text{ mcg/mg} = 300 \text{ mcg}0.3 mg×1000 mcg/mg=300 mcg
- Determine the number of tablets required:
- You have Synthroid in 150 mcg tablets.
- To find out how many 150 mcg tablets are needed to get 300 mcg, use the following formula: Number of tablets=Ordered doseDose per tablet=300 mcg150 mcg/tablet=2 tablets\text{Number of tablets} = \frac{\text{Ordered dose}}{\text{Dose per tablet}} = \frac{300 \text{ mcg}}{150 \text{ mcg/tablet}} = 2 \text{ tablets}Number of tablets=Dose per tabletOrdered dose=150 mcg/tablet300 mcg=2 tablets
Explanation:
Synthroid (levothyroxine) is a medication used to replace thyroid hormone in patients with hypothyroidism. The dosage of Synthroid is commonly expressed in micrograms (mcg), so it is essential to convert the ordered dose from milligrams (mg) to micrograms (mcg) to match the unit in which the medication is supplied.
In this case, the physician has ordered 0.3 mg of Synthroid daily. Converting this to micrograms helps in aligning it with the strength of the tablets available. Knowing that 1 mg equals 1000 mcg allows us to convert 0.3 mg to 300 mcg.
The Synthroid tablets you have are 150 mcg each. To administer the required 300 mcg dose, you need to determine how many 150 mcg tablets will provide the 300 mcg dose. This calculation is straightforward: divide the total dose required (300 mcg) by the dose per tablet (150 mcg).
The result, 2 tablets, indicates that you need to give 2 tablets to meet the ordered dose of 0.3 mg (300 mcg). This ensures the patient receives the correct amount of medication, aligning with the physician’s order and maintaining therapeutic effectiveness.