Reduction and Enlargement of the Official – PST04209 Compounding of Pharmaceutical Preparations
NTA Level 4 • Semester 2 • PST04209 Reduction and Enlargement of the Official Compounding of Pharmaceutical Preparations • Source Session/Topic 8 Full source-text version: all educational wording from the extracted learning source is retained; only presenter/tutor metadata and web-layout noise are removed, while formatting is improved for readability. Session 8: Reduction and Enlargement of the Official Formula to Obtain Required Formula for Compounding Total Session Time: 120 minutes + 1 hours of Assignment Prerequisites • None Learning Tasks By the end of this session students are expected to be able to: • Explain Reduction and Enlarging of Appropriate Formula for Compounding • Practice Reduction and Enlarging of Official Formula to Determine Amount of Each Ingredient Required for Compounding Resources Needed: • Flip charts, marker pens, and masking tape • Black/white board, chalk and whiteboard markers ,LCD projector and computer • Worksheet 8.1 take home assignment SESSION OVERVIEW Activity/ Step Time Content Method 1 05 minutes Presentation Introduction, Learning Tasks 30 minutes Reduction and Enlarging of Appropriate 2 Presentation Formula for Compounding 60 minutes Presentation Reduction and Enlarging of Official Formula to 3 Small group Determine Amount of Each Ingredient Required discussion for Compounding 4 10 minutes Presentation Key Points 5 05 minutes Presentation Evaluation 6 10 minutes Presentation Assignment CMT 04101 Dispensing NTA L 4 Semester 1 Facilitator Guide Session X: ———— -(Title)———————- 40 SESSION CONTENTS STEP 1: Presentation of Session Title and Learning Tasks (5 minutes) READ or ASK students to read the learning objectives and clarify ASK students if they have any questions before continuing. STEP 2: Reduction and Enlarging of Official Formula (30 minutes) • Reducing and enlarging formula are calculations performed when the required amounts of medicines (Prescribed/ordered) deviate from the official formula in a reference book. o Obtaining the amount of each ingredient required for compounding, the figures of the official formula are multiplied by a factor which is determined by the following proportion:- Total amount of the official = quantity of each ingredient in the official formula Total amount required x (x = quantity of each ingredient in the required amount i.e. x = total amount required × Quantity of each ingredient in the official formula . Total amount of official formula Thus the factor is determined by the ratio: Total amount required . Total amount of official formula Summary on obtaining the amount for each ingredient in the required amount (x): x = FACTOR × quantity of each ingredient in the official formula CMT 04101 Dispensing NTA L 4 Semester 1 Facilitator Guide Session X: ———— -(Title)———————- 41 STEP 3: Reduction and Enlarging of Official Formula (60 minutes) To Determine Amount of Each Ingredient Required for Compounding Activity: Small Group Discussion ( 60 minutes) DIVIDE students in small manageable groups ASK students to discuss in groups on the following questions • What is the amount of each ingredient required to make 40mls of Compound Sodium Chloride Mouth Wash BPC. 1973? • What is the amount of each ingredient required to make 20mls Aromatic Magnesium Carbonate mixture PCx. (Syn. Mistura Carminativa)? REFER Students to Tanzania Pharmaceutical Handbook (2011): Chapter 2, Formulary and list of alternatives for Pharmaceutical ingredients including water, for reference ALLOW students to discuss for 20 minutes ALLOW each groups to present for 5 minutes CLARIFY and SUMMARIZE by using the contents below • Official formula given for Compound Sodium Chloride Mouth Wash BPC. 1973 o Sodium chloride …………………………………….. 1.5g o Sodium bicarbonate …………………………………. 1.0g o Peppermint emulsion, concentrated …………………. 2.5 mL o Chloroform water double strength …………………… 50.0 mL o Water for preparation ………………………………. to 100.0mL Thus: Total amount of official formula = 100mL Total amount required = 40 mL Amount of each ingredient (x) =? FACTOR = Total amount required . Total amount of official formula FACTOR = 40 mL / 100mL FACTOR = 0.4 CMT 04101 Dispensing NTA L 4 Semester 1 Facilitator Guide Session X: ———— -(Title)———————- 42 Then, amount of each ingredient can be obtained as summarized in table below, Total amount of the official FACTOR total amount required Sodium chloride…………………….. 1.5g 0.6 g Sodium bicarbonate ………………… 1.0g 0.4 g Peppermint emulsion, concentrated…. 2.5 mL 0.4 1.0 mL Chloroform water double strength … 50.0 mL 20.0 mL Water for preparation ………….. to 100.0mL 40.0 mL Therefore amount required for each ingredient to make 40 mL of Compound Sodium Chloride Mouth Wash BPC. 1973 are: o Sodium chloride ……………………………………… 0.6 g o Sodium bicarbonate …………………………………. 0.4 g o Peppermint emulsion, concentrated …………………. 1.0 mL o Chloroform water double strength ………………….. 20.0 mL o Water for preparation …………………………….. to 40.0mL • Official formula given for Aromatic Magnesium Carbonate mixture PCx. (Syn. Mistura Carminativa) o Light magnesium carbonate ………………………..….. 3.0 g o Aromatic cardamom tincture ……………………..……. 3.0 mL o Sodium bicarbonate ……………..………………..……. 5.0 g o Chloroform water double strength …..………………… 50.0 mL o Water for preparation ………………….…………… to 100.0mL Thus: Total amount of official formula = 100mL Total amount required = 20 mL Amount of each ingredient (x) =? FACTOR = total amount required . Total amount of official formula FACTOR = 20 mL / 100mL FACTOR = 0.2 Then, amount of each ingredient can be obtained as summarized in table below, Total amount of the official FACTOR total amount required Light magnesium carbonate ……….. 3.0 g 0.6 g Aromatic cardamom tincture ………. 3.0 mL 0.6 g Sodium bicarbonate .………………. 5.0 g 0.2 1.0 mL Chloroform water double strength … 50.0 mL 10.0 mL Water for preparation …………. to 100.0mL 20.0 mL CMT 04101 Dispensing NTA L 4 Semester 1 Facilitator Guide Session X: ———— -(Title)———————- 43 Therefore amount required for each ingredient to make 20 mL of Aromatic Magnesium Carbonate mixture PCx, o Light magnesium carbonate …………………………….. 0.6 g o Aromatic cardamom tincture ………………………..…. 0.6 mL o Sodium bicarbonate ……………..…………………..…. 1.0 g o Chloroform water double strength …..………………… 10.0 mL o Water for preparation ………………….……………. to 20.0mL STEP 4: Key Points (10 minutes) • Reducing and enlarging formula are calculations performed when the required amounts of medicines