Aira Jhamaica DImacale
Sublingual or buccal tablets To dissolve under the tongue or in the mouth
Pharmaceutical Dosage Chapter 7: Capsules Capsules and Tablets
Alternative Products if Patients cannot Swallow an Intact Solid Dosage Form
Preferred when administered orally by adults: conveniently carried, readily identified, easily taken Variety of dosage strengths, providing: Flexibility to the prescriber Accurate individualized dosage for the patient Packaged and shipped by manufacturers at lower cost and with less breakage than comparable liquid forms More stable and have a longer shelf life
Pharmaceutical Standpoints
Solid dosage forms: Manufactured efficiently and productively Packaged and shipped at lower cost and with less breakage More stable Have longer shelf life than liquids
Characteristics
Disadvantages of Tablets and Capsules
Swallowing Formulation difficulties difficulties Some have poor bioavailability or poor water solubility Some have irritant effect on the GIT when taken orally
Key Features of a Good Tablet or Capsule
Stability of the active drug Accurate dose Uniformity (weight, amount of active ingredient, coating thickness, etc) Consistent performance (manufacturing parameters, pharmacokinetics) Appropriate disintegration and dissolution Can withstand packaging, shipping, handling without breakage Masking of taste and odor Pharmaceutically elegant Production economically sound
Overview of Capsules Capsules
Medicinal agents and/or inert substances enclosed in a small shell of gelatin Swallowed wholly Open capsule or crushed tablets Mixed with food or drink (children or patients who are unable to swallow solid dosage forms)
May be swallowed whole by patient May be inserted into the rectum for drug release and absorption from site The content may be removed from the gelatin shell and employed as pre measured medicinal powder, the capsule shell being use to contain a dose of the medicinal substance. Ex: Theo-dur Sprinkle Elegance Ease of use Portability Tasteless shell to mask the unpleasant taste/ odor Permits physician to prescribe the exact medication needed buy the patient Conveniently carried Readily identified Easily taken Tasteless when swallowed Commonly embossed or imprinted on their surface the manufacturer’s name and product code readily identified Available in variety of dosage strength Provide flexibility to the prescriber and accurate individualized dosage for the patient Packaged and shipped by manufacturers at lower cost, less breakage than liquid forms More stable and longer shelf life
Hard Gelatin Capsules
Chewable tablet Instant dissolving tablet Oral liquid Oral or nasal inhalation solution Suppository Injection
Also referred to as “DFC” Dry Filled Capsule, manufactured into two sections, the capsule body and a shorter cap Manufacture most of the commercially available medicated capsules Employed in clinical drug trials For extemporaneous compounding of prescriptions Contains 13% to 16% moisture Manufactured form: Gelatin Titanium dioxide (opacifying agent) 0.15% SO2 (prevents decomposition of gelatin) Colorants
Solid Dosage Forms that must be Left Intact Empty Capsule Shells
Enteric coated tablets To pass through the stomach for drug release and absorption in the intestine Extended-release dosage forms Provide prolonged release of the medication
Made of gelatin, sugar and water Hard or soft Softened (made elastic or plasticized) by adding glycerin or polyhydric alcohol like sorbitol) 1
Can be: clear, colorless, tasteless Colored with various FD&C and D&C dyes Made opaque by adding agents like titanium oxide
Gelatin
Obtained by partial hydrolysis of collagen from the skin, white connective tissue and bones of animals Properties: Stable in air (dry) Subject to microbial decompositions when moistened Insoluble in cold water, softens through absorption of up to 10 times its weight of water Soluble in hot water and in warm gastric fluid A protein, digested by proteolytic enzymes and absorbed High humidity: additional moisture is absorbed Becomes distorted and lose their rigid shape Remedy: use desiccant material (silica gel, slay, or activated charcoal) Extreme dryness: moisture is lost Becomes brittle and crumble when handled
Mixtures of agents that have a propensity to liquefy when admixed
Methods to Track the Passage of Capsules and Tablets through the GIT to Map their Transit Time and Drug Release Patterns
Dissolves and exposes its contents Unsuitable for aqueous liquids (softens gelatin and distorted, resulting in leakage of contents)
Desiccant To protect against the absorption of atmospheric moisture Dried silica gel Clay Activated charcoal Diluents or filter To produce the proper capsules fill volume Provide cohesion to the powders For the transfer of the powder blend into the capsule shells Lactose Microcrystalline cellulose Starch
Do not interfere with stability of the gelatin shells
Eutectic Mixture of Drugs
Additives
Lubricant or glidant Enhances flow properties Silicon dioxide Magnesium stearate Stearic acid or talc (about 0.25-1%) Surface active agent (surfactant) To facilitate wetting by GI fluids Sodium lauryl sulfate
Fixed or Volatile Oils
Gelatin Capsule
Pregelatinized Pregelatinized starch Croscarmellose Sodium starch glycolate
Gamma scintigraphy Gamma ray emitting radiotracer incorporated into the formulation with gamma camera coupled to a data recording system Pharmacoscintographic evaluation IVIVC for bioavailability of immediate release products Combination of scintigraphy and pharmacokinetic studies Assesses integrity and transit of time of enteric coated tablets through the stomach to the intestines Drug and dosage form evaluation in new product development Heidelberg capsule (No. 0 gelatin capsule) pH sensitive (non indigestible radio telemetric device) A non-radioactive means to measure solid dosage forms (fasting and non fasting human subjects) Gastric pH, gastric emptying time, gastric residence time
Manufacture of Hard Gelatin Capsule Shells
Manufactured in 2 sections: Capsule body Shorter cap
Drug Absorption Depends on a Number of Factors Excipients Added for Capsule Fill
Wetting agents (Li 2CO3) Added to capsule formulation to enhance drug dissolution Absorbent Separates interacting agents Absorbs any liquefied material that may form Magnesium carbonate Kaolin or light MgO Disintegrants To assist the break up and disintegration of the capsule’s contents in the stomach
Solubility of the drug Type of product formulation (immediate release, modified enteric) Gastrointestinal contents Physiologic character and response
Innovations to Provide Distinctions (Distinctive Looking Capsules)
Pulvules
End of the body-producing peg is tapered while leaving the cap-making peg rounded Spansule capsules 2
Capsules with the ends of both the bodies and caps highly tapered
Dry Formulations
Innovations in Capsule Shell Designs
Snap-fit
Blended thoroughly (active and inactive components) to ensure uniformity of powder mix for the fill
Care in Blending Two halves of capsule shells positively joined through locking grooves in the shell walls Ensure reliable closing of the filled capsule
Coni-snap Rim of the capsule body is tapered slightly, not straight Reduces the risk of the capsule rims touching or joining Eliminates splitting (telescoping) and/or denting of capsule shell Coni-snap supro Rim is tapered, upper capsule part extends (rounded edge of lower surface is visible) Opening is difficult, lower surface less gripping to pull 2 halves apart Increases security of contents and integrity of the capsule Eliminates splitting (telescoping) and/or denting of capsule shell
Lack of homogeneity for low dose drugs Results in significant therapeutic consequences
Preformulation Preformulation Studies
Determine whether all of the formulation’s bulk powders Effectively blended together Require reduction of particle size Other processes to achieve homogeneity
Methods in Reducing Particle Size
Milling Particles ranging from 50-1000 micrometer Micronization Drugs of lower dose or when smaller particles are required Particles ranging from 1-20 micrometer
Filling Hard Capsule Shells ***Check the book: coni-snap capsule parts, coni-snap and coni-snap supro capsule sizes (as in actual size of capsule in relation to a quart)
Capsule Sizes 000 00 0 1 2 3 4 5
15 grains 10 grains 7.5 grains 5 grains 4 grains 3 grains 2 grains 1 grain
972mg (largest) 648mg 486mg 324mg 259mg 194mg 130mg 64.8mg (smallest) (smallest )
Process of Capsule Filling
Preparation of Filled Hard Gelatin Capsules
Formulation development and preparation and selection of capsule size Filling the capsule shells Capsule sealing (optional) Cleaning and polishing of filled capsules
Use punch method Steps: Count the capsules Powder encapsulated placed on a sheet of clean paper or a glass or porcelain plate Powder mixed formed into a cake depth of approximately ¼ to 1/3 the length of the capsule body Empty capsule punched vertically into the powder cake until filled
Milling or sieving of all ingredients Blending Powder blender or empty capsules Capsule filler Capsule deduster or cleaner Capsule injection screen Capsule check-weighing system or reject Finished capsules Packaging
Examples of Fill in Hard Gelatin Capsules ***Check book: profill system
Powder or granulate Pellet mixture Paste Capsule Tablet
Developing the Formulation and Selection of Capsule Size
Goals in preparing a capsule: Accurate dosage Good availability Ease of filling and production Stability Elegance
Capsule Sealing
For the manufacturers: manufacturers: Sealing the joint between the 2 capsule parts using: Colored band of gelatin (KAPSEALS, Parker Davis) Heat welding process o Fuses the capsule cap to the body through the double wall thickness at their juncture (distinctive “ring” around the capsule) 3
Liquid wetting agent (liquid sealingwater and ethanol sprayed around the seam area), followed by thermal bonding Extemporaneously o Warm gelatin solution, lightly coating the inner surface of the cap prior to placement on the filled capsule body
Cleaning and Polishing Capsules
Small scale By rubbing with a clean gauze or cloth Large scale Cleaning vacuum affixed to the capsule-filling machines (removes any extraneous material) using Accela-Cota apparatus
Some Medications Commercially Prepared into Soft Gelatin Capsules
Acetazolamide: Diamox: Carbonic anhydrase inhibitor Cyclosporine: Sandimmune: Immunosuppressive Cyclosporine: Neoral: Immunosuppressive Digoxin: Lanoxicaps: Cardiac glycoside Ethosuximide: Zarontin: Anticonvulsant Ranitidine HCl: Zantac Geldose: Histamine H 2 receptor inhibitor
Water-immiscible volatile and nonvolatile liquids Vegetable and aromatic oils, aromatic and aliphatic hydrocarbons, chlorinated hydrocarbons, ethers, esters, alcohols and organic acids Water-miscible nonvolatile liquids Polyethylene glycols and nonionic surface active agents as polysorbate 80 Water-miscible and relatively nonvolatile compounds Propylene glycol and isopropyl alcohol (depending on factors as concentration used and packaging conditions)
Soft Medications Commercially Prepared into Soft Gelatin Capsules
Acetazolamide: Diamox sequels: Carbonic anhydrase inhibitor Cyclosporine: Sandimmune, Neoral: Immunosuppressive Ethosuximide: Zarontin: Anticonvulsant Ranitidine HCl: Zantac Geldose: Histamine H 2 receptor inhibitor
Liquids that cannot be Encapsulated into a Soft Gelatin Capsule
Easily migrate through capsule shell like materials with water above 5% Low molecular weight Water soluble and water volatile organic compounds (alcohols, ketones, acids, amine, and esters)
Preparation of Soft Gelatin Capsules Solids that may be Encapsulated into a Soft Gelatin Capsule
Plate process Uses set of molds to form capsules Rotary die process Most commonly used Rotary die machine Liquid gelatin flowing from an overhead tank into two continuous ribbons brought together between rotating die More efficient and productive Results in bicolored capsules Very accurate filling (+/-1-3%) Reciprocating die process Norton capsule machine Similar to rotary die (gelatin ribbons are formed) Differs in encapsulating process Produced, filled and sealed in a continuous operation Accogel capsule machine Stern Machine Unlike the other fill dry powders into soft elastic capsules Also use liquids or liquids and powders as fill Used to cover tablets with a gelatin film (geltabs) Variety of shapes, sizes, color possible
Solutions in a suitable liquid solvent, suspensions, dry powders, granules, pellets or small tablets
Compendial Requirements for Capsules
Added substances may only be used: Harmless in the quantities used Do not exceed the minimum amount required to provide their intended effect Do not impair the product’s bioavailability therapeutic efficacy or safety Do not interfere with requisite compendial assays and tests
Utilization of Soft Gelatin Capsules
To contain a variety of liquid, pastry and dry fills
Uses of Soft Gelatin Capsules 4
Containers for dispensing capsules Tight Well-closed Light-resistant In glass or plastic containers Some with packets of desiccant (prevents absorption of excessive moisture) Unit dose and strip packaging of solid dosage forms provides: Sanitary handling of the o medications Ease of identification o Security in accountability for o medications Disintegration test fop capsules Uses basket rack assembly, immersed 30 times per minute into a thermostatically controlled fluid (37 oC) and observed over the time described in the individual monograph To satisfy the test, the capsules disintegrate completely into a soft mass having no palpably firm core and only some fragments of the gelatin shell Dissolution test for capsules USP Apparatus I (stainless steel basket on a stirrer shaft) and USP apparatus II ( using paddle as the stirrer): same apparatus for immediate release tablet If the capsule shells interfere with the chemical analysis before proceeding with the sampling and chemical analysis: Contents of a specified number of capsules can be removed Empty capsule shells dissolved in the dissolution medium Weight variation Hard Capsules Individual weight of 10 capsules – weight – weight of empty shells = net weight of performed assay for content of active ingredient according to monograph Soft capsules Same as above, cut open the capsule and the content is removed by dissolving with suitable solvent Content uniformity Amount of active ingredient (determined by assay) must be: Within 85% to 115%of the label claim for 910 dosage units No unit outside the range of 70% to 125% of label claim Additional test are needed when 2-3 dosage units are outside of the desired range but within the stated extremes. Weight variation and content uniformity: uniformity of dosage units can be determined Content labeling requirement Express the quantity of each active ingredient in per dosage unit Stability testing Factors like temperature, humidity, light, formulative components and other container closure system using long term and accelerated stability tests Moisture permeation test For single unit and unit-dose containers to assure suitability for packaging
Comparison Between Hard and Soft Capsules Property Shell
Manufacturi ng processes
Hard Capsule
Content
Formulation technology
Made of gelatin, sugar and powder
Shells produced separately from the fill Continuous dipping, drying, removing and joining of capsules as peg containing plates rotate in and out of gelatin bath Dry powders or granules, pellet mixture, paste, small capsule and tablets
13%-16% moisture content Moisture proof packaging needed Encapsulation using succinylated gelatin
Soft Capsule
Gelatin, plasticizer (glycerin) or polyhydric alcohol (sorbitol) water and etc., colorants Shells and fill made and combined on one and the same process line By: plate process, rotary die process and reciprocating die process
Liquids and semi-liquids, suspensions, pasty materials, dry powders and preformed tablets More moisture Water content of fill not more than 5% Addition of titanium dioxides or iron oxides for light sensitive shells Packed in aluminum blisters Encapsulation uses succinylated, glycerol-free shell formulation, addition of PVP to the fill
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Uses color revealing desiccant pellet for color change and weight changes
Examples of some official capsules: Table 7.2: memorize Inspection
Visual or electric inspection To detect any flaws in the integrity and appearance of the capsules Defective caps should be rejected. CGMP regulations if number of production flaws is excessive The cause must be investigated, documented and steps undertaken to correct the problem.
Counting
Community pharmacy Counting small numbers of solid dosage units: specifically designed trays are used Spatula used to count and sweep the dosage units into the trough until the desired number is reached Tray must be wiped clean after every use to prevent batch-to-batch contamination Industrial scale Use of automated pieces of equipment dosage units into bulk containers
Packaging
Caps are packaged in: Glass or in plastic containers Some containing packets of desiccant ( prevent absorption of excessive moisture) Unit dose and strip packaging of solid dosage forms Provides sanitary handling of the medications medications Ease of identification Security in accountability for medication
Storage
Caps should be stored in tightly capped containers in a cool, dry place.
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