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Health

How can the amount needed for 1 dose of promethazine 25 mg via NG tube h.s. be calculated using both the ratio-proportion and dimensional analysis methods?

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To calculate the amount needed for 1 dose of promethazine 25 mg via NG tube h.s., we can use the ratio-proportion and dimensional analysis methods.

First, we set the unknown value as X. Since the units of the order and supply doses are the same, there is no need for unit conversion. However, the ordered dose is greater than the supplied dose, so the desired amount will be greater than 5 mL.

Using the formula “Dosage on hand / Amount on hand = Dosage desired / X Amount desired,” we substitute 6.25 mg for the dosage on hand, 5 mL for the amount on hand, 25 mg for the dosage desired, and X mL for the amount desired.

Performing cross multiplication, we get (6.25)(X) = (25)(5). Dividing both sides of the equation by 6.25, we solve for X and find that X = 20 mL.

Therefore, the required amount for 1 dose of promethazine 25 mg via NG tube h.s. is 20 mL.