Answer :
Final answer:
The correct formula for calculating drug dosage is option B, which takes into account the desired dose and body weight of the patient and the concentration of the drug. This method is often used in pediatric dosing and involves several steps including weight conversion and drug form adjustment.
Explanation:
The correct option for calculating oral and parenteral drug dosage using the basic formula is option B: Dosage = (Desired dose imes Body weight) / Concentration. This method of calculation is particularly useful for drugs that are dosed based on body weight, such as many medications for children. In order to calculate the dosage, it is a standard practice to first convert the body weight from pounds to kilograms if necessary, then use the weight to calculate the total milligram (mg) dose.
To calculate the actual volume or number of tablets that should be administered, the total mg dose then needs to be matched with the drug's available form, such as a liquid concentration (e.g., 250mg in 50ml) or tablet strength, and divided appropriately to achieve the correct dosage.
