A Review on Development of Colon Targeted Drug Delivery System

Both local and systemic medication administration can occur in the colon. Inflammatory bowel disease can be treated topically thanks to local delivery. However, if the medications are able to target the colon directly, the systemic adverse effects can be minimized and the treatment can be made more successful. The primary methods for CDDS (Colon Specific Drug Delivery), such as prodrugs, pH and time dependent systems, and microbially triggered systems, are primarily compared in this review. These methods had limited success and limitations when compared to more recent CDDS, such as pressure controlled colonic delivery capsules, CODESTM, and osmotic controlled drug delivery, which are unique in terms of achieving in vivo site specificity and manufacturing process feasibility. In order to improve treatment efficacy and reduce side effects, chronotherapeutics, an emerging discipline in pharmaceutical sciences, focuses on coordinating medication administration with biological rhythms. Time-dependent medication delivery systems are especially helpful since nocturnal depression and related sleep disorders frequently show circadian fluctuations. A common treatment for depression, anxiety, and sleeplessness is doxepin hydrochloride, a tricyclic antidepressant with sedative qualities. Reduced patient compliance and treatment efficacy may result from conventional dose forms' inability to deliver the best medication release at the necessary time. Chronomodulated pulsatile colon-targeted drug delivery systems are made to release the medication after a predefined lag time, guaranteeing that the medication is available when symptoms are at their worst. The creation and assessment of Doxepin HCl chronomodulated pulsatile colon-targeted tablets for nocturnal depression treatment are the main topics of this review. A thorough discussion is given of the various colon targeting strategies, pulsatile release mechanisms, polymers used, formulation methods, and evaluation criteria. The review also emphasizes the potential benefits of pulsatile colon-targeted systems in enhancing patient outcomes and the significance of circadian rhythm in managing depression.