SELF MICRO EMULSIFIED DRUG DELIVERY SYSTEM
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on Oct 05, 2012 Says :
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Presented by T.SHIVAKUMAR IV YEAR I SEM KOTTAM INSTITUTE OF PHARMACY Self micro emulsified drug delivery system
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WHAT IS SMEDDS SMEEDS is mixture of oils, surfactants, and cosurfactants, which are emulsified in aqueous media under conditions of gentle agitation of digestive motility that would be encountered in the gastro intestinal (GI) tract.
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AIM Most of the new drug candidates in development today are sparingly soluble and associated with poor bioavailability The main purpose is to prepare SMEDDS for oral bioavailability enhancement of a poorly water soluble drug
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Bio pharmaceutical classification system
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according to bio pharmaceutical classification system(BCS) the classII drugs have poor solubility and high permeability , thus the rate limiting process of absorption is the drug dissolution step. Formulation plays the major role in improving the rate and extent of absorption of such drugs from GI tract.
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Present study In the present study, an attempt was made to enhance the solubility and in vitro dissolution of candesartan cilexetil byformulating it as SMEDDS for filling into hard gelatin capsules.
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Drug profile Candesartan Cilexetil a prodrug is hydrolyzed to candesartan during absorption from the gastrointestinal tract., practically insoluble in water. Category: Antihypertensive Agents Subcategory: Angiotensin II Receptor Antagonist
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Materials Drug- Candesartan cilexetile- Oil -Miglyol 812 Surfactants- Cremophor EL &Tween 80 Cosurfactant -Labrasol
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The quantity of each content will be taken according to the pseudo ternary phase diagram This diagram is very essential in manipulation of ingredients in the formulation of SMEDDS
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CONSTRUCTION OF PSUEDO TERNARY PHASE DIAGRAMS: The pseudoternary phase diagrams of oil, surfactant– cosurfactant, and water were developed to optimize the formulation using a water titration method. The mixtures of oil and surfactant–cosurfactant ratios were diluted with water in a dropwise addition. Phase diagrams were constructed in the presence of drug to obtain the optimum concentrations of oil, surfactant, and cosurfactant. SMEDDS form fine oil– water emulsions upon addition to an aqueous media under gentle agitation.
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Pseudo ternary phase diagram The gray area indicates the microemulsion region
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formulation Four self-microemulsifying formulations were prepared using mixtures of oils, surfactants, and cosurfactants in various proportions. The self-microemulsification properties, droplet size, and zeta potential of these formulations were studied upon dilution with water. The optimized liquid SMEDDS formulation was converted into free flowing powder by adsorbing onto a solid carrier for encapsulation.
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images of pure drug substance (left), solid SMEDDS (right; magnification
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Dissolution studies The dissolution characteristics of solid intermediates of SMEDDS filled into hard gelatin capsules was investigated and compared with liquid formulation and commercial formulation to ascertain the impact on self-emulsifying properties following conversion.
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Results The results indicated that solid intermediates showed comparable rate and extent of drug dissolution in a discriminating dissolution medium as liquid SMEDDS indicating that the self-emulsifying properties of SMEDDS were unaffected following conversion. Also, the rate and extent of drug dissolution for solid intermediates was significantly higher than commercial tablet formulation. The results from this study demonstrate the potential use of SMEDDS as a means of improving solubility, dissolution, and concomitantly the bioavailability.
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Comparision of dissolution studies
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CONCLUSION A SMEDDS formulation of a poorly water-soluble drug, candesartan cilexetil was formulated for direct filling into hardgelatin capsules for oral administrationshowed faster rate of drug release than the marketed product in a discriminating dissolution media. The results from this study demonstrate the utility of SMEDDS to enhance solubility and dissolution of sparingly soluble compounds like candesartan which may result in improved therapeutic performance
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Advantages Protection of sensitive drug substances. The emulsion droplets will deliver the drug to GI mucosa in dissolved state readily accessible for absorption When a polymer is incorporated in terms of SMEDDS it gives prolonged release of medicament They are comprised of aqueous and oily components and therfore can accommodate both hydrophilic aswell as lipophylic drugs
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Disadvantages Chemical instabilities Irritates GIT Precipitation of the lipophilic drugs Physical and chemical changes in crystalline solid in Cryogenic grinding
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REFERENCES 1. Robinson JR. Introduction: semi-solid formulations for oral drug delivery. Bull Tech Gattefosse. 1996;89:11–3 2. Aungst BJ. Novel formulation strategies for improving oral bioavailability of drugs with poor membrane permeation or presystemic metabolism. J Pharm Sci. 1993;82:979–87. 3. Constantinides PP. Lipid microemulsions for improving drug dissolution and oral absorption: physical and biopharmaceutical aspects. Pharm Res. 1995;12:1561–72. 4. Pouton CW. Formulation of self-emulsifying drug delivery systems.
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