Drug Calculations Oral Dose Calculation Learning objectives Apply

Drug Calculations

Oral Dose Calculation Learning objectives : Apply the formula method to calculate drug doses. Solve dosage calculation for medication in the same system using ratio and proportion. Convert the amount used in metric system.

Oral Dose Calculation

Using proportion or ratio

Oral Dose Calculation

Using proportion or ratio in liquids

Types of needles

Needle Gauge and Length for Different Types of Injection TYPES OF NEEDLES SIZE IN GAGES Intradermal 25 Intramuscular 18 - 23 Intravenous 14 - 25 Sub coutaunouse 23 - 28 LENGTH IN INCH 1 - 3

General formula

Calculations with different measurement systems

commonly Prescribed Intravenous Fluids Commonly Prescribed Intravenous Fluid Abbreviation 0. 9% Sodium chloride solution NS 0. 45% Sodium chloride solution 1/2 NS 0. 25% Sodium chloride solution 1/4 NS 5% Dextrose in water 5% D/W OR D 5 W 10% Dextrose in water 10% D/W OR D 10 W 5% Dextrose in 0. 45% sodium chloride solution D 5 1/2 NS Dextrose with Ringer’s lactate solution D/RL Lactated Ringer’s solution RL Plasma volume expanders Dextran Albumin Hyper alimentation Total parenteral nutrition Partial parenteral nutrition TPN PPN

Calculate infusion in hour and minutes

Calculate drip rate or drop per mint To calculate drops per minute (gtt per min), you need three pieces of information: The total volume to be infused in milliliters • The drop factor of the tubing you will use • The total time for the infusion in minutes or hours The ﬂ ow rate of t he IV solution as it passes through the drip chamber is determined by the drop Common Drop Factors for IV Tubing Sets. Macro drop m. L Micro drop 10 gtt per m. L , 15 gtt per m. L 60 gtt per m. L 20 gtt per

Calculate drip rate or drop per mint

Intravenous Push (IVP) Medications Intravenous push medications should normally be given over 1 min to 5 min. Institution guidelines and reference materials provide acceptable rates of delivery and dilution requirements. Because the medication will have rapid effects, the total volume should be divided by the total minutes and then further divided into 15 -sec increments. Use a watch to verify the time of infusion.

Intravenous Push (IVP) Medications

PRACTICE PROBLEMS 1 - The physician prescribed 1, 000 m. L of RL to infuse over 12 hr. You should give? ? m. L per hr. Administer 800 m. L of NS over 10 hr. The drop factor is 20 drops per m. L. You should give ____ drops per min. Administer 500 m. L of solution over 24 hr. The drop factor is 60 drops per m. L. You should give ____ drops per min. The physician prescribed an IV of 100 m. L of D 5 W to run at 100 m. L per hr. The drop factor is 10. You should set the flow rate at ____ drops per min. The physician prescribed an IV of 1, 500 m. L of Ringer’s lactate solution to infuse over 20 hr. The drop factor is 15 gtt per m. L. You should give ____ drops per min.