Tablets are solid preparations each containing a single dose of one or more active substances.

1. Physical chemical and pharmaceutical-technological properties of powder and granules and their impact on the technology ofsolid dosage forms. Tablets.

2. Tablets are solid preparations each containing a single dose of one or more active substances. They are obtained by compressing uniform volumes of particles or by another suitable manufacturing technique, such as extrusion, moulding or freeze-drying (lyophilisation).

3. Advantages of tablets: • Easy to handle • Variety of manufacturing methods • Can be mass produced at low cost • Consistent quality and dosing precision • Can be self - administered • Enhanced mechanical, chemical, and microbiological stability compared to liquid dosage forms • Tamperproof • Lend themselves to adaptation for other profiles, e.g., coating for sustained release

4. Disadvantages of tablets: • Inability to use unconscious and during vomiting; • Possibility of tablets cementing in long-term storage; • Slowly action of medicines substances from tablets; • Some medicines form concentrated solutions that irritate the stomach; • Tablets include many auxiliary substances that are ballast for the human organism.

5. Classification of the tablets By the way of obtaining: • 1. Pressed tablets. • 2. Formations or triturations tablets. By composition: • simple • complex (multicomponent). By the structure of construction: • Carcass tablets • singlelayer tablets • multilayer tablets • coated tablets • uncoated tablets

6. Classification by method of adminietration • Oriblettae - tablets, for oral adminietration • Resoriblettae - tablets, sublingual use • Implantabulettae - made aseptic, are used as implants • Injectabulettae - made aseptic, are used to obtain of injection solutions • Solublettae - used for preparing solutions with different pharmaceutical purposes • Dulciblettae - sweet tablets for chew • Uretratoria - urethral tablets • vagitoria, bacilli, boli, - pressed vaginal and rectal dosage forms

7. Several categories of tablets for oral use : • uncoated tablets; • coated tablets; • effervescent tablets; • soluble tablets; • dispersible tablets; • orodispersible tablets; • gastro-resistant tablets; • modified-release tablets; • tablets for use in the mouth; • oral lyophilisates.

8. Tablet characterization 1. Appearances: • Tablet thickness • Tablet shape and size 2. Friability of uncoated tablets 3. Resistance to crushing of tablets: • Hardness or breaking strength 4. Uniformity of dosage units Uniformity of mass (weight variation) 5. Uniformity of content 6. Dissolution 7. Disintegration 8. Microbiological quality 9. Quantity of active substances 10. Identification of active substances

9. Tablets need to be hard enough that they don't break up in the bottle, yet friable enough that they disintegrate in the gastric tract. • Tablets need to be strong enough to resist the stresses of packaging, shipping and handling by the pharmacist and patient.

10. Most drug and inactive excipients used in tablet formulation are in the solid stateas amorphous powder or crystals of various morphological structures. There maybe substantial differences in particle size, surface area, crystal morphology, wetting,and flowability as well as many physical properties of drug, excipients, and theirblends.

11. In tablet design many factors haveto be taken into account, such as thephysicolchemical properties of active compoundand excipients. An important role also has to be attributed to tabletingmachines.

12. Properties of initial substances which are research to the design and optimization of solid dosage formulations: • physical- true density; shape, size and surface characteristics of particles, specific surface, adhesive forces (sticking onto a surface) an' cohesion (slicking of particles inside a body), interfacial activity, melting point, etc.;

13. Properties of initial substances which are research to the design and optimization of solid dosage formulations: • chemical- solubility, reactivity;

14. Properties of initial substances which are research to the design and optimization of solid dosage formulations: • technological- loose density, tapped density, compaction degree, flowabitity moisture content, particle size distribution, dispersity, porosity» compressibility

15. Properties of initial substances which are research to the design and optimization of solid dosage formulations: • structural - mechanical- plasticity, hardness), elasticity, viscosity of acrystal lattice, etc.

16. The general design criteria for tablets aregiven as follows: • Optimal drug dissolution and, hence, availabilityfrom the dosage form for absorptionconsistent with intended use; • Accuracy and uniformity of drug content. • Stability, including the stability of the drugsubstance, the overall tablet formulation, disintegration,and the rate and extent of drugdissolution from the tablet for an extendedperiod. • Patient acceptability. As much as possible, thefinished product should have an attractiveappearance, including color, size, taste, etc., asapplicable, in order to maximize patentacceptability and encourage compliance withthe prescribed dosing regimen. • Manufacturability. The formulation design shouldallow for the efficient, cost-effective, practical productionof the required batches.

18. All tablets are made by a process of compression.Compressing powder or granule into a tablet is one of the simplest and oldestways of forming a product known to humans. The basic unit of any tablet press is tooling consisting of two punches and a die,called a station. The upper and lower punches come together in the die that containsthe tablet formulation.Solid, in the form of relatively small particles, is containedin a die and a compressing force of severaltonnes is applied to it by means of punches.

19. Filling:The volume of the powder is measuredA: The lower punch is allowed to descend to its lowest point.B: The bore of the die is fi lled completely with powder.C: The lower punch is raised to a predetermined point so that excess.D: The powder is leveled by passing under a blade.E: This ensures that the bore of the die is filled with as exact volume of thematerial to be used, and the next stage can begin.

20. Compression: Pressure is applied to form the granule into a solidF: The upper punch is lowered into the bore of the die.G: Precompression gives the powder an initial “ punch ” to remove excessair.H: The powder is fully compressed.I: The correct pressure is reached.J: The upper punch is lifted out of the way ready for tablet ejection.

21. EjectionThe tablet is ejected and the next tablet will be formedK: The lower punch begins to rise in the bore of the die lifting the tablet untilstep L is reached.L: Its base is level with the tap of the die.M: The tablet is pushed aside into the take - off chute by passing under a staticblade.N: The lower punch moves to its lowest position ready for filling similarto A and the entire cycle is repeated.

22. Properties for successfully transformatio of the powder into tablets: • Good particle flow. • The ability of the particles to cohere under theinfluence of a compressing force. This coherencemust be retained after the compressing force hasbeen removed. • The ability of the tablet to be ejected from the dieafter the compressing force has been removed.

23. Excipient materialsare normally required alongwith the active ingredient in order to give the tablet the desired properties. • Fillers • Binder • Disintegrating Agent • Glidant, Antiadherent, and Lubricant • Flavor, Sweetener, and Colorant

24. Types of disintegrants(acting with different mechanisms): • promotion of the uptake of aqueous liquids by capillary forces, • swelling in contact with water, • release of gases when in contact with water, • destruction of the binder by enzymatic action.

26. Formation used for: • triturations tablets • tablets for obtaining solutions, drops • substances exploding under action pressure (nitroglycerin) • when not need great strength of tablets • when not appropriate introduce great number of auxiliary substances in the tablet

27. STAGES OF FORMATION Mixing of the components (medicines and auxiliary substance) Wetting of powders mixture with alcohol or water Chafing of the mass in the special plates Outthrust formed tablets from the plates Drying of the tablets

28. Steps of the compression process • The filling exact volume of the material from funnel in the channel of the die; • Pressure is applied to form the powder into a solid; • Outthrust tablets from the matrix by raising the lower punch.

29. Steps of the process of pressing

30. Methods of tablets production with compression: • Direct compressing. • Pressing the previous granulation. • Granulation Types: • wet granulation; • dry granulation (briquette); • structural granulation; • granulation by melting.

31. Rotary tabulating machines (RTM)

32. Indicators quality of tablets • Appearance • Disintegration tablets • Solubility • Average mass of tablets and deviation in weight of separate tablets • Uniformity of content current of substance • Uniformity of mass • Abrasion • Stability to crush • Determination of talc (SiO2) • Quantitative determination of medicinal substances • Identification • Microbiological cleanliness

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