DRUG CALCULATION WITH FORMULAS

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 Drug calculation

 Drug calculation is the process of determining the correct dose of medication for a patient based on factors such as their weight, age, medical history, and other relevant factors. This is an important process to ensure that patients receive the appropriate amount of medication for their needs and to minimize the risk of adverse reactions or medication errors.

Drug calculations may involve various types of measurements, including volume (such as milliliters), weight (such as milligrams or grams), and concentration (such as a percentage or ratio of active ingredient to total volume). The calculation process typically involves converting between these different units of measurement, as well as accounting for any adjustments needed based on the patient's individual characteristics or medical condition.

There are various methods and tools that can be used to perform drug calculations, including calculators, conversion tables, and formulas. It is important for healthcare professionals to have a strong understanding of drug calculations and to be able to perform them accurately in order to ensure the safety and well-being of their patients.

  1. Calculators: These are electronic devices or computer programs that can perform drug calculations quickly and accurately. Some examples include the Omni Calculator, the Global RPH website, and the Epocrates app.

  2. Conversion tables: These are tables that provide information on how to convert between different units of measurement, such as milligrams and grams or milliliters and liters.

  3. Formulas: There are various formulas that can be used to calculate drug doses based on factors such as the patient's weight or age. One commonly used formula is the Clark's rule, which calculates the pediatric dose based on the child's weight.

  4. Electronic health records (EHRs): Many healthcare facilities use EHRs that include drug calculation tools built into the software. These tools can help healthcare professionals to calculate drug doses quickly and accurately while reducing the risk of errors.

It is important for healthcare professionals to select the appropriate tool based on their individual needs and the specific requirements of their patients. Additionally, it is important to double-check all drug calculations to ensure accuracy and patient safety.


There are several drug calculation formulas that can be used in different clinical settings. Here are some common ones:

  1. Dosage calculation based on patient weight: Dosage = weight (kg) x dose (mg/kg)

  2. Dosage calculation based on body surface area: Dosage = BSA (m2) x dose (mg/m2)

  3. Infusion rate calculation: Infusion rate = total volume (mL) / time (hours)

  4. Flow rate calculation for IV fluids: Flow rate = volume (mL) / time (minutes) x drop factor / 60

  5. Pediatric dose calculation based on child's age: Dosage = (age in years + 1) x adult dose / (age in years x 4)

Example of a drug calculation:

A patient weighing 70 kg requires a medication dose of 10 mg/kg of body weight. How much medication should be given?

Using the dosage calculation formula:

Dosage = weight (kg) x dose (mg/kg)

Dosage = 70 kg x 10 mg/kg

Dosage = 700 mg

An example of a baby drug calculation:

A 6-month-old infant weighing 8 kg requires a medication dose of 12 mg/kg of body weight. The medication concentration is 60 mg/mL. How much medication should be given?

Using the dosage calculation formula:

Dosage = weight (kg) x dose (mg/kg)

Dosage = 8 kg x 12 mg/kg

Dosage = 96 mg.



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