Summary of drug calculations PDF

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Summary of drug calculations Answers to morphine calculation questions For your interest at home, work out the maximum dose a 27kg child would receive via each route. 27 X 0.1= 2.7mgs (maximum dose I/V 4 hourly) 27 X 0.2= 5.4mgs (maximum dose S/c or I/M 4 hourly) 27 x 0.04 = 1.08mgs (maximum dose hourly) 10mgs added to 50mLs saline gives us 0.2mg / 1mL of saline = 1.08 x 50 10 = 5.4MLs per hour (maximum rate per hour of this dilution) Drug calculations. Try to work out manually before you use a calculator 1. Your patient is ordered 450mg of Paracetamol six hourly. The stock strength on the bottle is 250mg in 5mLs. How many mLs of paracetamol is required? a) 0.9mLs b) .09mLs c) 5mLs d) 9mLs 2. All Salbutamol nebulisations are made up to 4mLs with normal saline. If your patient is ordered 0.5mLs Salbutamol (5mg/mL), how much normal saline would you add? a) 4mLs b) 3mLs c) 2.5mLs d) 3.5mLs 3. Your patient is ordered 2.5 mgs of Salbutamol 4-6 hourly. The stock strength on the bottle is 5mg/mL. How many mLs of Salbutamol do you require? a) 0.5mLs b) 2.5mLs c) 5mLs d) 0.25mLs

4. Your post-op patient is ordered IV fluids – 500 mLs of 2 ½ % Dextrose, 0.45% N/Saline with 10mmol potassium chloride (KCl). You need to add the KCl to the bag of IV fluid. The ampoules of KCl are 20mmol KCl in 10mLs. How many mLs of KCl will you insert to the bag of fluid? a) 5mLs b) 2.5mLs c) 7mLs d) 4.5mLs 5. Your five year old patient is written up for Cephalexin 140 mg, four times per day (QID), orally. The suspension strength is 250 mg/5mLs. How many mLs are to be given? a) 2.2mLs b) 5mLs c) 2.8mLs d) 2mLs 6. Your patient is ordered IV Ceftriaxone 800 mg daily. When reconstituted, the strength available is 100 mg/mL. How many mLs are given? a) 0.8mL b) 8mLs c) 4mLs d) 0.08mLs 7. Dexamphetamine comes in tablets of 5mg. Your patient is ordered 10mg At night. How many tablets are required? a) ½ tablet b) 1 ½ tablets c) 2 tablets d) 2 ½ tablets 8. Pethidine 45mgs is ordered. Ampoules on hand contain 50mgs/mL. What volume is required for injection? a) 0.0 mLs b) 1mL c) 0.9mLs d) 0.5mLs 9. Your patient is ordered 400mgs Paracetamol 6 hourly. The stock strength on the bottle is 240mgs in 5mLs. How many mLs of Paracetamol is required? a) 5.5mLs b) 10mLs c) 10.3mLs d) 8.3mLs

10. A child weighing 45kgs is ordered 45mgs Prednisolone daily. The tablets available are Prednisolone 25mgs and Prednisolone 5mgs. How many of each tablet would you give? a) 1½ x 25mgs + 1 x 5mgs tabs b) 1 x 25mgs + 4 x 5mgs tabs c) ½ x 25 mgs + 8 x 5mgs tabs d) 1 x 25mgs + 2 x 5mgs tabs Jasmine is a 18 month old who weighs 13kg. She has epilepsy and despite treatment in the emergency room with IV Midazolam she continues to have tonicclonic seizures. She requires a loading dose of Phenytoin - 18mg/kg - you are required to infuse the Phenytoin in a 50ml bag of n/saline over 30mins. Stock strength of Phenytoin is 250mg/5ml. 1. Calculate the dose required of Phenytoin 2. Calculate the volume of Phenytoin required 3. State the rate of the IV pump to deliver the 50mls of n/saline and Phenytoin over 30mins Henry is a four year old boy who has just been diagnosed with tonsillitis, he weighs 16kg. He is complaining of a sore throat and also has a fever. He is miserable, irritable and clinging to his mother. To relieve his pain and discomfort, Paracetamol and Nurofen are charted. He was given Paracetamol four hours ago by his mother. The dose of Paracetamol 4hrly is 15mg/kg and stock strength is 250mg/5ml. The dose of nurofen is 5-10mg/kg. Henry has been charted for 160mg Nurofen po. 1. 2. 3. 4.

Calculate the dose of Paracetamol How many mLs of Panadol does Henry require? Is the dose of Nurofen within prescribing limits? What is the range in mgs of Nurofen that Henry can have?

Jack is 8yrs old and has been involved in a motor vehicle accident. He is currently on spinal precautions and is unable to be weighed. He has a compound tibia and fibula fracture and requires iv pain relief and iv antibiotics. The doctor has charted 0.05 - 0.1mg/kg of iv morphine and 400mg of flucloxacillin. To reconstitute flucloxacillin add 9.3mls of water for injection to a 1 gram vial. This will give a strength of 100mg/ml. 1. Using the formula weight (kg) = 2 (age + 4) calculate Jacks weight 2. As Jacks pain is currently 5/10 - the Dr decides to give the minimum dose of morphine. What is the minimum dose of morphine you can give?

3. What is the maximum dose of iv morph for Jack? 4. Calculate the dose in mg/kg for flucloxacillin if Jack weighs 8kg and has been ordered 400mg of iv antibiotic 5. How many mls of flucloxacillin are required?...