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If the dose requires that a total of 40 mg be given, then you take the ratio of the stock bottle (mg/mL) and solve for the total amount of mL that are needed by multiplying the amount of mL required (x):
Multiply by 5 on both sides to give:
Then solve for x:
Another, possibly quicker, way to solve would be to set up a proportion - one side the stock bottle ratio, and the other side the dosage requirements:
Cross multiply and you get:
And you would solve this the same way as above.
So the patient should receive 9.091 mL of secobarbitol.
Multiply by 5 on both sides to give:
Then solve for x:
Another, possibly quicker, way to solve would be to set up a proportion - one side the stock bottle ratio, and the other side the dosage requirements:
Cross multiply and you get:
And you would solve this the same way as above.
So the patient should receive 9.091 mL of secobarbitol.