A physician orders 5 mL of phenobarbital elixir for a patient with seizures caused by meningitis....

A physician orders 5 mL of phenobarbital elixir for a patient with seizures caused by meningitis. It is available as 0.03 gram per 7.5 mL. How many mg does the patient receive?

Expert Solution

Answer

Ordered dose = 5 ml

Available dose = 0.03 gram / 7.5 ml i.e. 30 mg / 7.5 ml

We can calculate the dose as follows

30 mg = 7.5 ml

X mg = 5 ml

By cross multiplication, 30 mg x 5 ml = X mg x 7.5 ml

i.e. X = 30 x 5 / 7.5 = 20

5 ml contains 20 mg.

It can also be calculated as

30 mg = 7.5 ml

1ml = 30 / 7.5 = 4mg

Hence 5 ml contains 20 mg (4 x 5 = 20).

The patient receives 20 mg of medicine.

Nightingale answered 2 years ago

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A physician orders 5 mL of phenobarbital elixir for a patient with seizures caused by meningitis....

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Expert Solution

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