A prescription reads: Famotidine 40 mg/5 mL 50 mL Sig: 0.4 mL PO t.i.d. What amount of medication, in mg, is given each day?

Rationale

9.6 mg of medication is given each day.

The prescription indicates a dosage of 0.4 mL taken three times a day (t.i.d.). Since the concentration of Famotidine is 40 mg per 5 mL, we can calculate the daily total by first determining the amount in each dose and then multiplying by the number of doses.

A (1.2) YOUR ANSWER

This choice represents an incorrect calculation of the total daily dose. If 0.4 mL provided only 1.2 mg, that would imply an incorrect concentration of the medication. The actual concentration must be utilized to determine the correct amount.

B (3.2) YOUR ANSWER

This answer suggests that the daily total is 3.2 mg. However, this is also incorrect as it underestimates the dosage based on the provided concentration of 40 mg per 5 mL. Each dose of 0.4 mL yields significantly more than this total.

C (6.4) YOUR ANSWER

The choice of 6.4 mg reflects the calculation of the amount for two doses instead of three. Each dose must be multiplied by three (t.i.d.) to arrive at the daily total. Thus, this option does not account for the full regimen prescribed.

D (9.6) CORRECT

Each dose of 0.4 mL provides 3.2 mg (calculated as 0.4 mL × 40 mg/5 mL), and with three doses a day, the total is 3.2 mg × 3 = 9.6 mg. This calculation confirms that the correct total amount administered daily is indeed 9.6 mg.

Conclusion

To summarize, the daily dosage of Famotidine prescribed is calculated based on the concentration provided and the frequency of administration. With the correct arithmetic, each dose contributes to a total of 9.6 mg per day, ensuring effective treatment according to the physician's instructions. Understanding these calculations is crucial for accurate medication management.

A prescription reads: Famotidine 40 mg/5 mL 50 mL Sig: 0.4 mL PO t.i.d. What amount of medication, in mg, is given each day?

9.6 mg of medication is given each day.

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