Semisolid Pharmaceutical Dosage Forms – PST04104 Pharmaceutical Dosage Forms
NTA Level 4 • Semester 1 • PST04104 Semisolid Pharmaceutical Dosage Forms Pharmaceutical Dosage Forms • Source Session/Topic 3 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 3: Semisolid Pharmaceutical Dosage Forms Total Session Time: 120 minutes + 1 hour Assignment Prerequisites • Session 1 : Introduction to pharmaceutical dosage forms Learning Tasks By the end of this session students are expected to be able to • Define Semisolid Dosage Form • List the Ideal Properties of Semisolid Dosage Forms • Explain the Types and Uses of Semisolid Dosage Forms Resources Needed: • Flip charts, marker pens, and masking tape • Black/white board, chalk and whiteboard markers • Overhead projector (OHP) • Computer SESSION OVERVIEW |Step |Time |Activity/ |Content | | | |Method | | |1 |05 minutes |Presentation |Introduction, Learning Tasks | |2 |10 minutes |Presentation |Definition of Semisolid Dosage Form | | | |Brainstorming | | |3 |20 minutes |Presentation |Ideal Properties of Semisolid Dosage| | | |Buzzing |Forms | |4 | |Presentation |Types and Uses of Semisolid Dosage | | |65 minutes |Small group |Forms | | | |discussion | | |5 |05 minutes |Presentation |Key Points | | 6 |05 minutes |Presentation |Evaluation | | 7 |10 minutes |Presentation |Assignment | SESSION CONTENTS STEP 1: Presentation of Session Title and Learning Tasks (5 minutes) READ or ASK students to read the learning tasks and clarify ASK students if they have any questions before continuing STEP 2: Definition of Semisolid Dosage Form (10 minutes) |Activity: Brainstorming (5 minutes) | | | |Ask students to brainstorm on the following question: | | | |What is a semisolid dosage form? | | | |ALLOW few students to respond | | | |WRITE their responses on the flip chart/ board | | | |CLARIFY and SUMMARISE by using the content below | • A semisolid dosage form is a product of semisolid consistency applied to skin or mucous membranes for therapeutic or protective action or cosmetic function • Semisolid dosage forms are intended for local drug delivery for treatment of conditions such as rashes, skin irritation, stings, infections (fungal, viral or bacterial) and infestations STEP 3: Ideal Properties of Semisolid Dosage Forms (20 minutes) |Activity: Buzzing (05 minutes) | | | |ASK students to pair up and buzz on the following question for 5 | |minutes | | | |What are the ideal properties of semisolid dosage forms? | | | |ALLOW few pairs to respond and let other pairs to add on points not | |mentioned | | | |WRITE their response on the flip chart/board | | | |CLARIFY and SUMMARIZE by using the content below | • The ideal properties of semisolid dosage forms are divided into physical and physiological o Physical properties: ▪ Smooth texture ▪ Elegant (neat) in appearance ▪ Non dehydrating ▪ Non gritty (no small pieces of sand or dust) ▪ Non greasy and non-staining ▪ Non hygroscopic o Physiological properties: ▪ Non-irritating ▪ Do not alter membrane / skin functioning ▪ Miscible with skin secretion ▪ Have low sensitization effect • Generally semisolid dosage forms are easily applicable with efficient drug release and high aqueous wash ability STEP 4: Types and Uses of Semisolid Dosage Forms (65 minutes) |Activity: Small Group Discussion ( 30 minutes) | | | |DIVIDE students into small manageable groups | | | |ASK students to discuss on the following question | |What are the types of semisolid dosage forms? | | | |ALLOW students to discuss for 15 minutes | | | |ALLOW few groups to present and the rest to add points not mentioned | | | |CLARIFY and SUMMARIZE by using the contents below | • The followings are the types of semisolid dosage forms with their corresponding uses o Ointments ▪ Are soft hydrocarbon based semisolid preparations, composed of fluid hydrocarbon meshed in a matrix of higher melting solid hydrocarbon, example petrolatum ▪ Ointments are of greasy nature thus they stain clothes, are generally poor solvent for most drugs and usually decrease the drug delivery capabilities of the system ▪ The main rule of the local therapy is that if the skin is dry, use an ointment o Creams ▪ Are viscous semisolid emulsion system with opaque appearance compared with the translucent ointments ▪ Consistency and rheological characters depend on whether the cream is water in oil (w/o) or oil in water (o/w) ▪ Properly designed water in oil creams are elegant drug delivery system, pleasing in both appearance and feel after application ▪ Oil in water creams are non-greasy and easy to rinse ▪ Creams are good for most topical purposes especially wet skin o Pastes ▪ Pastes are basically ointments into which a high percentage of insoluble solid has been added ▪ The extraordinary amount of particulate matter stiffens the system ▪ Pastes are less penetrating than ointments ▪ Pastes make particularly good protective barrier when placed on the skin. In addition to forming an unbroken film, the solid they contain can absorb and thereby neutralize certain noxious chemicals before they ever reach the skin ▪ Like ointments, pastes form an unbroken relatively water impermeable film ▪ Unlike ointments, the film is opaque and therefore, an effective sun block consequently o Gels (Jellies) ▪ Gels are semisolid coherent systems in which a liquid phase is constrained within a polymeric matrix (consisting of natural or synthetic gum) having a high degree of physical or chemical crosslinking ▪ Gels are transparent or translucent non-greasy semisolid gels ▪ Some gels are as transparent as water itself, have an aesthetically pleasing state while others are turbid because the polymer is present in colloidal aggregates that disperse light ▪ Gels are used for medication or lubrication o Poultices ▪ Are soft, viscous, pasty preparations for external use ▪ Poultice must retain heat for a considerable time because they are intended to supply warmth to inflamed parts