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Intra Vaginal Drug Delivery System: an Overview American Journal of Advanced Drug Delivery www.ajadd.co.uk Review Article Intra Vaginal Drug Delivery System: An Overview Chinmaya Keshari Sahoo* 1, Prakash Kumar Nayak 2, Deepak Kumar Sarangi 3, Tanmaya Keshari Sahoo 4 1Research Scholar, Osmania University College of Technology, Osmania University,Hyderabad, A.P. - 500007 2Norwich clinical Services Pvt. Ltd., Clinical Research co-ordinator cum Pharmacist, Sahakara Nagar, Banglore- 560092 3Omega College of Pharmacy, Edulabad, Ranga Reddy-501301 4Institute of Pharmacy and Technology, Salipur, Cuttack, Odisha-754202 Date of Receipt - 17/04/2013 ABSTRACT Date of Revision- 17/04/2013 Date of Acceptance- 22/04/2013 The human vagina represents a potential, accessible space that offers a valuable route for drug delivery through the use of specifically designed carrier systems for both local and systemic applications. Intra-vaginal drug delivery is particularly appropriate for drugs associated with women's health issues but may also have applications in general drug delivery within the female population. Vagina is one of the best routes for drugs administration like contraceptive steroids, metronidazole, anti-retroviral, etc. An intra-vaginal controlled-release drug delivery system is an effective means for achieving a continuous delivery of therapeutic agents, not only the systemically active drugs, such as contraceptive steroids, but also the locally active drugs, such as metronidazole and other drugs like Zidovudine, Lamivudine, etc. Address for This continuous “infusion” of drugs through the vaginal mucosa can Correspondence prevent the possibility of hepato-gastrointestinal first-pass Osmania University metabolism gastric irritation of drugs and fluctuation of dosing College of Technology, interval. The advantage of intra-vaginal controlled drug Osmania administration over conventional/traditional oral administration is the drug absorbed systemically, because due to the presence of dense University,Hyderabad, network of blood vessels in vaginal wall. A range of drug delivery A.P.-500007 platforms suitable for intra-vaginal administration are hydro-gels, vaginal tablets, pessaries/suppositories, particulate systems, and E-mail: intra-vaginal rings. sahoo.chinmaya83@g mail.com Keywords : Vagina, First pass metabolisim, Intra vaginal drug delivery, pessaries. American Journal of Advanced Drug Delivery www.ajadd.co.uk Sahoo et al______________________________________________________ ISSN-2321-547X INTRODUCTION Vagina is route for administration for Variability in drug absorption related with contraceptives, anti-fungal, and menstrual cycle, menopause and antimicrobials. It is used for the pregnancy, achievement of local or for systemic Influence with sexual intercourse 4. absorption. The vaginal wall is very well Personal hygiene. suited for the absorption of drugs for Some drugs are sensitive at vaginal pH systemic use. As it contains a vast network of blood vessels 1. VAGINAL ANATOMY AND This route offers certain advantages, PHYSIOLOGY WITH RESPECT TO such as avoidance of gut and hepatic first DRUG DELIVERY pass metabolism, reduction in The vagina is a fibro-muscular tube gastrointestinal and hepatic side effects, and approximately 10 cm in length comprised of local targeting of drugs to the reproductive three distinct layers namely; organs. Vaginally administered agents and an outer adventitial layer, formulations are mainly being developed to a middle muscularis layer and provide “dual prophylaxis” for contraception An innermost mucosal layer 5 and protection against microbial infections 2 The vaginal rugae and micro-ridges on including Acquired Immune Deficiency the epithelial cell surface permit the vagina Syndrome(AIDS) and other sexually to expand, allow the placement of vaginal transmitted diseases (STDs). Drug delivery formulations and increase the surface area of technologies that have been used for vaginal the vagina thus enhancing drug absorption 6. drug delivery include the intra-vaginal ring The vagina has remarkable features in (IVR) and Vaginal Site bio-adhesive terms of vaginal secretion, pH, enzyme technology. activity and micro-flora. These factors affect formulation spreading and retention as well Advantages of intra vaginal drug delivery as absorption and drug release in vagina. system Prolonged release, Vaginal Secretions Minimal systemic side effects, The vaginal discharge is a mixture of An increase in bioavailability, multiple secretions that collect in the vagina Use of less total drug than an oral dose, from peritoneal, follicular tubal, uterine, First-pass metabolism can be avoided, Bartholin's and Skene's glands 7. In presence Self medication is possible. of moisture, solid dosage formulations should Contact with digestive fluid is avoided ideally disperse in the vaginal canal and degradation of drug is minimized 3. immediately after insertion to avoid Nausea, vomiting, emesis induced inconvenience to the users. through oral administration is avoided. Quick onset of action. Enzyme Activity The specific enzymatic activity of Disadvantages four different amino peptidases in vaginal Gender specificity, homogenates decreases in the order: sheep > Patient incompliance, guinea pig > rabbit ≥ human ≥ rat 8 . The Only a few drugs are administered by this human genital tract has lower enzymatic route, activity leading to less degradation of protein AJADD1[1][2013]043-055 Sahoo et al______________________________________________________ ISSN-2321-547X and peptide drugs in the vagina than the following factors: gastrointestinal tract 9. Physiological Factors Vaginal pH changes in the thickness of epithelium The pH of the healthy female genital layer, tract is acidic (pH 3.5–4.5) and is maintained cyclic changes, within that range by bacterial conversion of changes in the hormones level, glycogen from exfoliated epithelial cells to volume of vaginal fluid, lactic acid 10 . alteration of vaginal pH and Sexual arousal can potentially affect drug Ideality of intra vaginal drug delivery release from any intravaginal delivery system system and also alter its rate of Component should melt at vaginal absorption. temperature i.e. at 36 °C, For e.g. Intra-vaginal drug delivery device 1. Vaginal absorption of steroids is affected should be non-toxic and non irritating, by the thickness of vaginal epithelium 11 . It should not have any meta-stable form, 2. Vaginal absorption of estrogen shows The preparation should have wetting and high in post menopausal women emulsifying properties. compare to premenopausal women 12 . It should have proper viscosity, so avoid The high volume of vaginal fluid the leakage of preparation from vagina may increase the absorption of poorly water (in case of semisolid dosage form), soluble drugs; however the same condition The preparation should have proper bio- again responsible to remove the drug from adhesive/muco-adhesive properties, so the vaginal cavity and subsequent reduction increase the contact time between the of drug absorption. membrane and Preparation. Further cervical mucus, a glycoprotein gel can possibly be exploited for bioadhesive drug delivery. However at FACTORS AFFECTING ABSORPTION the same time it may serve as a permeability OF DRUGS barrier for different drug candidates 13 . Again changes in the pH of vagina will alter degree The drug transport across vaginal of ionization of weak electrolytic drugs and membrane mainly takes place by three major affect the release profile of pH sensitive ways; drugs 14 . Transcellularly- via concentration dependent diffusion through the cells, Physicochemical Factors Paracellularly- mediated via tight Lipophilicity, junctions and Ionization, Vesicular or receptor mediated transport. Molecular weight, Drug absorption from vaginal delivery Surface charge and system is mainly takes place in two main Chemical nature can influence the vaginal steps: drug absorption. Drug dissolution in vaginal lumen and In consideration to permeability the Membrane penetration. lipophilic steroids like progesterone and The rate and extent of drug absorption estrone having better permeability than the after intra-vaginal administration may vary depending on AJADD1[1][2013]043-055 Sahoo et al______________________________________________________ ISSN-2321-547X hydrophilic one like hydrocortisone and shape of number 7 Copper is released by a testosterone. combination of ionization and chelation from a copper wire wrapped around the Vaginal & Uterine Route for vertical limb. This is effective for up to 40 Sustained/Controlled Release drug m. Delivery Application of prostaglandin containing vaginal rings for induction of labor or Sustained and controlled-release pregnancy termination. Anti-fungals have devices for drug delivery in the vaginal and been important drug candidates for the uterine areas are most often for the delivery treatment of gynecological conditions. of contraceptive steroid hormones. One such The vaginal delivery of azole anti- application is the medicated vaginal ring. gungals as clotrimazole, miconazole, Medicated vaginal rings fabricated from econazole, itraconazole and sertaconazole is silastic 382 medical grade elastomer. These effective in the topical treatment of vaginal are of ‘doughnut-shaped’. Also known as candidiasis. intra-vaginal rings or V-Rings. Vaginal rings provide a means of delivering a drug to the systemic circulation Novel concepts in vaginal drug delivery at a controlled release rate. Several vaginal ring products are currently
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