A child is brought to the emergency room complaining of severe leg cramps. Her mother explains that the leg cramps have been occurring more and more frequently and the child is in constant pain. After performing blood tests, the physician tells the child's mother that the child has a magnesium deficiency. The physician orders magnesium sulfate 350 IM now. On hand, the emergency room has magnesium sulfate 20% solution.  Calculate the amount to administer: ________.

Fill in the blank(s) with the appropriate word(s).


1.8 mL

The dosage strength of a 20% solution is 20 g per 100 mL.
H = 20 g; Q = 100 mL; O = 350 mg
Convert the units:

D × 1,000 = 350 mg × 1
= 0.35 g
Calculate the amount to administer:

A × 20 = 100 mL × 0.35

A = 1.75 mL, rounded to 1.8 mL

Nursing

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