Podcast
Questions and Answers
If a prescription includes Metformin 1 g to be taken BD, and you have 500 mg tablets, how many tablets will the patient take each day?
If a prescription includes Metformin 1 g to be taken BD, and you have 500 mg tablets, how many tablets will the patient take each day?
4 tablets
Given that Ranitidine syrup is prescribed at 150 mg BD, and the stock is 15 mg/mL, how many mL will the patient need per day?
Given that Ranitidine syrup is prescribed at 150 mg BD, and the stock is 15 mg/mL, how many mL will the patient need per day?
20 mL
A child weighs 30 kg and is prescribed Paracetamol at 15 mg/kg QDS. How much Paracetamol will the child receive each day?
A child weighs 30 kg and is prescribed Paracetamol at 15 mg/kg QDS. How much Paracetamol will the child receive each day?
1800 mg
Using dimensional analysis, convert 5 inches to centimeters.
Using dimensional analysis, convert 5 inches to centimeters.
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How much time in hours is equivalent to 1 week?
How much time in hours is equivalent to 1 week?
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If a prescription for a child requires 15 mg of medication per kg, how is the total dosage calculated for a child weighing 30 kg?
If a prescription for a child requires 15 mg of medication per kg, how is the total dosage calculated for a child weighing 30 kg?
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How would you determine the dosage frequency for liquid medications based on the prescription given?
How would you determine the dosage frequency for liquid medications based on the prescription given?
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For corticosteroid dispensing, why is it important not to perform calculations for the patient?
For corticosteroid dispensing, why is it important not to perform calculations for the patient?
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In weight-based dosing, what unit of measurement is primarily used to calculate the dose for a child?
In weight-based dosing, what unit of measurement is primarily used to calculate the dose for a child?
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What is the significance of dimensional analysis in dispensing medication?
What is the significance of dimensional analysis in dispensing medication?
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How many mL of D5W is needed to provide 150 mg of dextrose to a hypoglycaemic patient?
How many mL of D5W is needed to provide 150 mg of dextrose to a hypoglycaemic patient?
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To prepare 250 mL of a 15% solution from an 80% stock solution, how many mL of stock solution are needed?
To prepare 250 mL of a 15% solution from an 80% stock solution, how many mL of stock solution are needed?
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If the formula for B.M.X. includes 110 mL of Maalox, how much of it is needed to make 500 mL of B.M.X.?
If the formula for B.M.X. includes 110 mL of Maalox, how much of it is needed to make 500 mL of B.M.X.?
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How much yellow soft paraffin must be added to produce a 0.5% w/w sulphur ointment from 50g of 2% ointment?
How much yellow soft paraffin must be added to produce a 0.5% w/w sulphur ointment from 50g of 2% ointment?
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What is the total volume of 5% dextrose required to administer 150 mg of dextrose?
What is the total volume of 5% dextrose required to administer 150 mg of dextrose?
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When diluting a solution, if you have 250 mL of a 15% solution, what is the volume required if starting from an 80% solution?
When diluting a solution, if you have 250 mL of a 15% solution, what is the volume required if starting from an 80% solution?
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How much Maalox should be used to prepare 500 mL of B.M.X. if the ratio requires 110 mL of Maalox for 240 mL of the total?
How much Maalox should be used to prepare 500 mL of B.M.X. if the ratio requires 110 mL of Maalox for 240 mL of the total?
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In making 0.5% w/w sulphur ointment, how many grams of yellow soft paraffin should be added to 50g of 2% sulphur ointment?
In making 0.5% w/w sulphur ointment, how many grams of yellow soft paraffin should be added to 50g of 2% sulphur ointment?
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If a patient requires a 5% dextrose solution to receive 150 mg of dextrose, what volume should be administered?
If a patient requires a 5% dextrose solution to receive 150 mg of dextrose, what volume should be administered?
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For a preparation of a 15% solution from an 80% stock solution, how do you calculate the required stock volume?
For a preparation of a 15% solution from an 80% stock solution, how do you calculate the required stock volume?
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What is the total volume of Paracetamol suspension (in mL) to be administered in each dose for a child weighing 30 kg?
What is the total volume of Paracetamol suspension (in mL) to be administered in each dose for a child weighing 30 kg?
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If the patient takes lactulose (dosage of 3 x 5 mL spoonfuls three times a day), how many days will a 400 mL bottle last?
If the patient takes lactulose (dosage of 3 x 5 mL spoonfuls three times a day), how many days will a 400 mL bottle last?
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For a child weighing 15 kg, how much codeine (in mL) do you need if the dose is 200 mcg/kg and the concentration is 5 mg/mL?
For a child weighing 15 kg, how much codeine (in mL) do you need if the dose is 200 mcg/kg and the concentration is 5 mg/mL?
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How many Prednisolone 5 mg tablets are needed for a regimen of 40 mg x 5/7, reducing by 5 mg every 5 days until 0?
How many Prednisolone 5 mg tablets are needed for a regimen of 40 mg x 5/7, reducing by 5 mg every 5 days until 0?
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What is the total daily dosage of Prednisolone for a prescription of 30 mg x 6/7 over 6 days with a reduction of 5 mg every 6 days?
What is the total daily dosage of Prednisolone for a prescription of 30 mg x 6/7 over 6 days with a reduction of 5 mg every 6 days?
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Calculate the total administration in mL of a Paracetamol suspension taken daily for a week based on the earlier calculated dose.
Calculate the total administration in mL of a Paracetamol suspension taken daily for a week based on the earlier calculated dose.
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How many mL of a 5 mg/mL codeine solution are needed for a 15 kg child based on the clinical dose of 200 mcg/kg?
How many mL of a 5 mg/mL codeine solution are needed for a 15 kg child based on the clinical dose of 200 mcg/kg?
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What cumulative total of Prednisolone does a patient take if they reduce the dosage by 5 mg every 5 days until they reach zero?
What cumulative total of Prednisolone does a patient take if they reduce the dosage by 5 mg every 5 days until they reach zero?
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How many milligrams of Drug X are required to make 5 mL of an 8% w/v solution?
How many milligrams of Drug X are required to make 5 mL of an 8% w/v solution?
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How much volume in mL would a prescription call for if advised to take 3 x 5 mL spoonfuls of lactulose three times a day?
How much volume in mL would a prescription call for if advised to take 3 x 5 mL spoonfuls of lactulose three times a day?
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If 5 g of solid ingredient is added to 45 g of a base, what is the % w/w strength?
If 5 g of solid ingredient is added to 45 g of a base, what is the % w/w strength?
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For a regimen of 40 mg/day Prednisolone decreased over days, what is the total needed to last for a full week?
For a regimen of 40 mg/day Prednisolone decreased over days, what is the total needed to last for a full week?
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A concentrated antiseptic solution contains Chlorhexidine Gluconate and Cetrimide in the ratio 20:1. If a 25 mL sachet contains 0.015% w/v Chlorhexidine, what quantity of Cetrimide will it contain?
A concentrated antiseptic solution contains Chlorhexidine Gluconate and Cetrimide in the ratio 20:1. If a 25 mL sachet contains 0.015% w/v Chlorhexidine, what quantity of Cetrimide will it contain?
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How many millilitres of a 1-in-400 stock solution should be used to make 4L of a 1-in-2,000 solution?
How many millilitres of a 1-in-400 stock solution should be used to make 4L of a 1-in-2,000 solution?
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How much salicylic acid (in grams) should be added to 680g of 10% salicylic acid ointment to prepare 15% salicylic acid ointment?
How much salicylic acid (in grams) should be added to 680g of 10% salicylic acid ointment to prepare 15% salicylic acid ointment?
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What is the concentration of salicylic acid in grams when mixing 100g of a 10% ointment with X grams to form a 15% ointment?
What is the concentration of salicylic acid in grams when mixing 100g of a 10% ointment with X grams to form a 15% ointment?
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To obtain a solution of 25% w/v from an initial solution of 10% w/v, how many grams of the active ingredient are required for a final volume of 500 mL?
To obtain a solution of 25% w/v from an initial solution of 10% w/v, how many grams of the active ingredient are required for a final volume of 500 mL?
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If a 100g ointment contains 15g of salicylic acid, what is the remaining weight of excipients in the ointment?
If a 100g ointment contains 15g of salicylic acid, what is the remaining weight of excipients in the ointment?
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Determine the total weight of a 1-in-200 stock solution needed to prepare 2L of a 1-in-800 solution.
Determine the total weight of a 1-in-200 stock solution needed to prepare 2L of a 1-in-800 solution.
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In a pharmacy, if you want to maintain a concentration of 5% w/v but have a 10% w/v solution, what volume must be diluted with 100 mL of base to achieve this?
In a pharmacy, if you want to maintain a concentration of 5% w/v but have a 10% w/v solution, what volume must be diluted with 100 mL of base to achieve this?
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Study Notes
Medicine Dispensing
- Dosage instructions must be interpreted correctly by the pharmacist, never the patient
- Dosage instructions should be simple for the patient to understand
- Measurements should be as simple as possible for the patient
- Special considerations should be made for children and how dosage forms are made
Dispensing Calculations - Session 2
- Dispensing solid dosage forms involves calculating the number of tablets a patient should take per day
- Dispensing liquid dosage forms involves calculating the total volume of liquid a patient should take per day
- Weight-based dosing calculates how much medication a patient should take based on body weight
- Corticosteroid dispensing involves calculating the total number of tablets a patient should take for a specific period
Dimensional Analysis
- Dimensional analysis is a method used to express the same quantity in different units
- Example: 5 in = 12.7 cm
- Example: 1 week = 168 hours
Dispensing Solid Dosage Forms
- Example: If a prescription instructs Metformin 1 g tab BD, and the stock contains 500 mg tablets, the patient should take 4 tablets per day
Dispensing Liquid Dosage Forms
- Example: If a prescription instructs Ranitidine syrup 150 mg BD, and the stock contains 15 mg/mL, the patient should take 20 mL per day
Weight-Based Dosing
- Example: If a prescription instructs Paracetamol susp 15 mg/kg QDS x 5/7, and the stock contains 200 mg/mL, and the patient weighs 30 kg, the patient should take 45 mL for the entire prescription
Corticosteroid Dispensing
- Example: For Prednisolone 30 mg x 6/7. Reduce by 5mg every 6 days until 0, there are multiple ways to calculate the total number of tablets needed:
- Add each individual day's dosage
- Add the sum of the dosages by row
- Add the sum of the dosages by column
- Calculate using the sum of consecutive integers
- Use the formula n(n+1)/2 * # of days where n = maximum number of tablets
Compounding Calculations
- Compounding is becoming less common
- Compounding from prefabricated forms is becoming more common
Session 3 Calculations
- How many mL of D5W (5% dextrose) should be administered to a hypoglycemic patient to provide 150 mg of dextrose?
- Answer: 3 mL
- Dilution of stock solution (liquids)
- Example: A GP orders 250 mL of 15% (v/v) solution to be prepared from a stock supply of 80% (v/v) solution. How many mL of stock solution are needed?
- Answer: 46.875 mL
- Following a Formula
- Example: The formula for BMX is Benylin 110 mL, Maalox 110 mL, Lidocaine 2% 20 mL. How much Maalox liquid would be required to make 500 mL of BMX?
- Answer: 229 mL
- Dilution of Solids
- Example: You are supplied with 50g of 2% sulfur ointment. How many grams of yellow soft paraffin must be added to produce 0.5% w/w sulfur ointment?
- Answer: 150 grams
- Increasing Concentration
- Example: How much salicylic acid (in grams) should be added to 500g of 10% salicylic acid ointment to prepare 25% salicylic ointment?
- Answer: 100 grams
Session 3 Calculations - Vevox
- There are 5 Vevox questions for Session 3
- Vevox questions cover how to calculate different quantities with ratios and proportions, dilutions, mixtures, and compounding
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Description
This quiz covers essential principles of medicine dispensing, focusing on dosage instructions and calculations for both solid and liquid forms. Special considerations for pediatric patients and dimensional analysis are also explored, providing a comprehensive understanding of medication management. Test your knowledge on critical calculations for effective patient care.
