HOMOGENEOUS OINTMENTS

1. HOMOGENEOUS OINTMENTS Author: as. Yu.Yu. Plaskonis

2. Ointments are the soft medical form, appointed for causing on a skin, wounds and consist of basis and medicinal substances, evenly divided.

3. For physical and chemical classification: ointments are the free comprehensively dispersible shapeless structured systems from plastic-resiliently viscid dispersible environment.At the room temperature ,ointment ,as a result of high viscidity, keep a form and lose it at the increase of temperature, growing into thick liquids. From typical liquids they differ absence of noticeable fluidity.

4. Negative qualities: some ointments have the limited spectrum of pharmacological action; some connections of ointments on hydrophobic bases can make the expressed «greenhouse» effect which limits their application in medical practice; some ointments operate on a skin irritating. Positive qualities: possibility of introduction in the complement of ointments different medicinal substances (liquid, soft, hard); possibility of prescribtion of ointments with the local action or resorbtion action; achievement of high concentration of medicinal substances in a skin, biological liquids of organism; simple and safe application of ointments is in comparing to other medical forms .

5. Requirements to ointments • Ointments must own certain consistency properties which are characterized by some indexes: by plasticity, viscidity, period, relaxations on which in a great extent depends the degree of pharmaceuticaldynamics of ointments. • Ointments must have optimum dispersion of medicinal substances and their distributing ,which guarantees a maximal therapeutic effect and invariability of connection at storage. At the same time they must be stable, without admixtures and with the exact concentration of medicinal substances.

6. CLASSIFICATION OF OINTMENTS According to a place of application distinguish such ointments: • dermatological (actually ointments) which are used on a skin • eye which are used on the conjunctiva of eye • for a nose • vaginal • urethral • rectal

7. By the type of the dispersible systems (in dependence on the degree of dispersion of medicinal substances and character of its distributing in basis) distinguish: • homogeneous • heterogeneous ointments.

8. Depending on consistency distinguish: • liquid ointments (whether liniments) • creams • gels • actually ointments • dense ointments - pastes

9. By the type of the dispersible systems ointment divided to: * homogeneous ointment • ointments- solutions • ointments- alloys • extraction ointment * heterogeneous • ointments- suspensions • ointments - emulsion • combined

10. Heterogeneous • Suspension ointments contain solid powder, crushed medicinal substances which are insoluble in the basis and distributed it by type of suspension • Emulsion ointment characterized by the presence of the liquid component that is insoluble in basis and distributed it to the type of emulsion. • Combined ointment - a combination of different disperse systems

11. On the type (by character) of ointment bases distinguish ointments, prepared on: • hydrophobic • hydrophilic • diphilic (hydrophilic-hydrophobic) bases.

13. The main task of technology in the manufacture of ointments is that the drugs have been possible dispersed and evenly distributed throughout the mass basis; • consistency would provide easy dab and uniform distribution of the skin or mucous membrane, the stability of the ointment would ensure consistency in the application of their composition and storage

14. Prescription OF OINTMENTS 1. With denotation of basis and amount of medicinal substances in units of mass: Rp.: Mеntholi 0,1 Vaselini 10,0 Miscе, fiat unguеntum Da. Signa: Ointment is for a nose. 2. Without denotation of basis: а) with pointing of concentration of medicinal substance Rp.: Unguenti Zinci oxydi 3 % 10,0 Da. Signa: Ointment is for hands. б) without pointing of concentration of medicinal substance Rp.: Unguenti Xеroformii 100,0 Da. Signa: Zmazuvati the staggered areas of skin.

15. GENERAL RULES OF PREPARING OINTMENTS Calculations of amounts of medicinal substances and basis • If the concentration of medicinal substance was`t noted in a recipe, it is followed to prepare 10 % ointment. • Ointments the samples of which are standardized. prepare according to concentration of medicinal substances, marked in NTD. • Introductions of medicinal substances in ointment conduct taking into account their physical and chemical properties and written amounts. • Medicinal substances, soluble in fats (camphor, Mentholum, Thymolum, , a crystalline fenolum, Anaesthesinum less than 2 %, salol but other) enter in monophase ointments-solutions, dissolving them in fat basis or its component part.

16. If total amount of these matters less than 5 %, they are ground with a liquid, what similar after properties to basis: Vaseline -Vaseline oil, fatty basis -drupaceous butter. Liquids take so much, how many matters. • If total amount of these matters more than 5 %, they are ground with an even amount to mass of dry substances of molten basis. • In hydrophilic bases these substances enter like suspensions.

17. Making of homogeneous ointments • Ointments-alloys are connection of a few mutually fusible and mutually solublecomponents. Fats can enter in the complement of such ointments, beeswax, hydrocarbons, resins, plasters, butters, and othersubstances. Ingredients can be both hard and soft or liquid. • The alloy of components is conducted on an aquatic bath in a porcelain or enameled cup.

18. General technology of ointments-alloys consists in the following: • in the first turns meltthe most refractory substance • to the got fusion add other ingredients in order of decline of temperature of melting; • liquid components add in the last turn • this liquid fusion if necessary strainthrough a gauze in a warmed-up mortar (50-55 °С) • mix to cooling • essential oils add in the last turn at a temperature not higher 40 С.

19. Comparative fusibility of substances which enter in the complement of ointments-alloys is resulted below in such order: • 1. Tserezin • 2. Ozocerite • 3. A beeswax is yellow • 4. A beeswax is white • 5. Petrolatum • 6. A paraffin is hard • 7. Spermaceti • 8. Beef fat • 9. Lanolin is waterless • 10. Vaseline • 11. Hydrogenated fats • 12. Naphthalanum • 13. Butters vegetable and artificial • 14. Essential oils

20. Rp.: Naphthalaniliquidiraffinati 70,0 Paraffini 18,0 Petrolati 12,0 Misce, fiat unguentum Da. Signa. For bandages.

21. Medicinal preparation – ointment alloy with mutually fusiblecomponents which have a different temperature of drowning. • Melt petrolatum (t - 60-62 °С), to the got fusion at stirring add a paraffin (t - 50-54 °С) and in the last turn - oil naphthalini. An alloy is mixed in a warm mortar to the complete cooling-down.

22. WPC (f.s.) Date № recipe Petrolati 12,0 Paraffini 18,0 Naphthalani of liquidi raffinati 70,0 m = 100,0 Prepared: (signature) Checked: (signature)

23. Medicinal substances, soluble in fats (camphor, Mentholum, Thymolum, a crystalline phenolum, Anaesthesinum to 2 %, salol but other) enter in mono phase ointments-solutions, dissolving them in fat basis or its component part.

24. Ointment- solution • If total amount of these substances is less than 5 %, they are ground with a liquid, what similar by the properties to basis: Vaseline is Vaseline butter, fatty basis is drupaceous butter. Liquids take so much, how many matters • If total amount of these substances is more than 5 %, they are ground with an even amount to mass of dry substances of molten basis.

25. At making of ointments-solutions it is needed to take into account the following rulls: • if a medicinal substance has a volatile characteristics (camphor, Mentholum but other), then it is dissolved in the cold fusion (45-50 °С); • it is not followed to prepare satiate solutions, because permeates can crystallize at cooling; • many medicinal preparations, soluble in hydrophobic bases, reduce the temperature of melting of the last as a result of education eutectic, that is why for a receipt enough dense ointments-solutions in the contain of ointment bases enter making more compact components (10% beeswax or paraffin) on a concordance with a doctor.