The treatment of ulcerative colitis (inflammatory bowel disease, IBD) has been achieved by using colon specific drug delivery system bearing 5-ASA and Camylofine dihydrochloride. Chitosan microspheres were prepared separately for both the drugs using emulsion method followed by enteric coating with EudragitS-100. The in vitro drug release was investigated in different simulated GIT medium. The drug release in PBS (pH7.4) and simulated gastric fluid has shown almost similar pattern and rate, whereas a significant increase in drug release (70.3 +/- 1.36 and 72.5 +/- 1.33% of 5-ASA and Camylofine, respectively) was observed in medium containing 3% rat caecal matter, after 24 h. In control study, 57.1 +/- 1.13% of 5-ASA and 59.2 +/- 1.2% of Camylofine release was observed in 24 h. For enzyme induction, rats were orally administered with 1 mL of 1% w/v dispersion of chitosan for 5 days and release rate studies were conducted in SCF with 3% w/v of caecal matter. An enhanced drug release (i.e., 92.3 +/- 3.81 and 95.5 +/- 3.52% 5-ASA and Camylofine, respectively) was observed after 24 h in dissolution medium containing 3% caecal content obtained from enzyme induced animals. In vivo data showed that microspheres delivered most of its drug load (76.55 +/- 2.13%) to the colon after 9 h, which reflects its targeting potential to the colon. It is concluded that orally administered microspheres of both drugs can be used together for the specific delivery of drug to the colon and reduce symptoms of ulcerative colitis.
Transdermal Patches have been contributing important part to the pharmaceutical industry and medical practice by providing advances in delivery of treatment with existing and novel drugs. Transdermal drug delivery system has made great contribution in the medical practices but many researches are undergoing to achieve its full potential. Transdermal drug delivery system was came into existence to overcome difficulties of drug delivery especially oral route. Transdermal drug delivery refers to means of delivering drugs through the surface of the skin for local or systemic treatment. The drug functions after absorption through skin into the systemic circulation via capillary action at certain rate. Transdermal patches are now widely used as topical and transdermal delivery systems. These patches are a significant result of advancements in skin science, technology, and knowledge, which have been created via trial and error, clinical observation, and evidence-based investigations dating back to the earliest human records. A transdermal patch is a medicated adhesive patch that is applied to the skin and used to deliver a precise amount of medicine into the bloodstream via the skin. A benefit of transdermal medication administration over other forms of delivery systems such as oral, topical, intravenous (i.v.), intramuscular (i.m.), and so on is that it is non-invasive. Transdermal patches provide medication to the patient in a regulated manner, either by a porous membrane covering a reservoir of medication or by body heat melting tiny layers of drug contained in the adhesive. This review article covers the basics of transdermal patches, such as the many types of patches, how they're made, and what factors influence them, among other things.
Keyword: Skin Delivery, Transdermal Drug Delivery System, Transdermal Excipients, Pulmonary Arterial Hypertension, Sildenafil Citrate.
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