ANSWER.
10) Calculation of volume(ml) of drug required.
Formula
Volume(ml) = Desired dose (D) / Dose in hand(H) * Quantity(Q)
Here
Desired dose (D) = grain 3/4
Convert grain to mg for calculation
1 grain = 64.79
So
Desired dose (D) = 3/4 * 64.79
= 48.59 mg.
Dose in hand (H) = 20 mg.
Quantity(Q) = 1 ml
As per above formula
Volume(ml) of drug required = D/H * Q
= 48.59 / 20 * 1
= 2.43 * 1
= 2.43
= 2.4 ml.
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