Dosage Calculation (Quantity on Hand)

This formula computes the quantity which contains the amount of drug on hand and reports the result as number of tablets or other applicable units.  dosage amount when you know the amount of the amount of drug on hand,  the amount of drug to be administered to a patient, and the quantity of drug corresponding to the amount (h).  It reports the desired dose in milligrams (mg).

Input Variables:

• `X` = Amount to be administered 
• `D` = Desired dose
• `H` = Amount of drug on hand

Returned Value:

• `Q` = Quantity of drug on hand

Equation:

      D = X * H / Q