Numeracy Seminar Student Slides PDF

WEEK 13 & 14 Numeracy Seminar Slide 1 of 21 PHA113 MPharm WEEK 13 & 14 Learning Objectives • Consolidate learning from week 11 lecture by completion of worksheets • Understand the concepts of: • Quantity to supply • Using an extemporaneous formulary • Dose calculations 2 PHA113 MPharm ...

WEEK 13 & 14 Numeracy Seminar Slide 1 of 21 PHA113 MPharm WEEK 13 & 14 Learning Objectives • Consolidate learning from week 11 lecture by completion of worksheets • Understand the concepts of: • Quantity to supply • Using an extemporaneous formulary • Dose calculations 2 PHA113 MPharm WEEK 13 & 14 Quantity to supply • Prescribers do not always tell you how much of a medication to supply • You need to be able to calculate quantities to supply e.g. • How many tablets are needed to complete a course? • How many bottles of antibiotic liquid should be supplied? • How many capsules are needed for a titrating dose? 3 PHA113 MPharm WEEK 13 & 14 Quantity to supply Sample Question A patient is taking Amoxicillin 500mg capsules, 1 three times a day for 7 days. How many capsules should you supply? 1 capsule three times a day = 3 capsules daily For 7 days: 3 x 7 = 21 Ans: 21 capsules 4 PHA113 MPharm WEEK 13 & 14 Quantity to supply Sample Question A patient is given the following prescription. How many days will this inhaler last if used as prescribed? Clenil 100mcg CFCF inahaler (200 doses) Inhale TWO puffs twice a day 2 puffs twice a day = 4 puffs daily 200 ÷ 4 = 50 Ans: 50 days 5 PHA113 MPharm WEEK 13 & 14 Using an Extemporaneous Formulary • Extemp. formularies are “recipes” that can be used to make specific products Sample Question You are asked to manufacture 120g of Zinc and Castor Oil ointment using the following formula: Zinc Oxide 7.5g Arachis Oil 30.5g Cetostearyl Alcohol 2g White Beeswax 10g Castor Oil to 100g How much zinc oxide will you need? 6 PHA113 MPharm WEEK 13 & 14 Using an Extemporaneous Formulary Sample Question Zinc Oxide Arachis Oil Cetostearyl Alcohol White Beeswax Castor Oil 7.5g 30.5g 2g 10g to 100g 7.5g in 100g 1.5g in 20g 9g in 120g ÷5 x6 Ans: 9g 7 PHA113 MPharm WEEK 13 & 14 Dosage Calculations • For some drugs doses need to be calculated based on patient parameters e.g. • Weight • BMI • BSA 8 PHA113 MPharm WEEK 13 & 14 Dosage Calculations Sample Question A 2-month old child requires paracetamol at a dose of 60mg/kg. The child weighs 5.5kg. How many mg of paracetamol should be given per dose? 60mg x 5.5kg = 330mg Ans: 330mg 9 PHA113 MPharm