Around the course of the past few decades, essential oils have been an increasingly prominent subject of research all over the world. These naturally occurring chemicals may find applications in a wide variety of medical and biotechnological fields. In light of the urgent need to find new anti-ulcer agents and the significant amount of effort that has been put into developing medications for the treatment of ulcers, the purpose of this review is to investigate the anti-ulcer activities of fifteen different bioactive compounds that can be found in essential oils.

One of the most common causes of permanent vision loss is glaucoma. Damage to the optic nerve and retinal ganglion cells, the root cause of visual field impairment, is typically the result of elevated intraocular pressure. Some patients' illness worsens even when treated with eye medications that reduce intraocular pressure. The pathophysiology of glaucoma is not only thought to involve mechanical and vascular dysfunctions of the eye, but also oxidative stress, neuroinflammation, and excitotoxicity. Therefore, natural compounds with antioxidant and anti-inflammatory qualities may offer a different strategy for treating glaucoma. This review summarizes the most up-to-date preclinical and clinical research on natural compounds that have been proven to contain neuroprotective characteristics for retinal ganglion cells and, consequently, may be useful in the treatment of glaucoma. Baicalein, forskolin, marijuana, ginsenoside, resveratrol, and hesperidin are all effective at lowering intraocular pressure. On the other hand, antioxidant, anti-inflammatory, and anti-apoptosis mechanisms are among those through which Ginkgo biloba, More research is needed to determine whether natural items can be used as a safe and effective treatment for glaucoma.

The creation of a transdermal drug delivery system (TDDS) has been one of the most sophisticated and innovative approaches to drug delivery. The transdermal drug delivery system has attracted considerable attention because of its many potential advantages, including better patient compliance, avoidance of gastrointestinal disturbances, hepatic first-pass metabolism, and sustained delivery of drugs to provide steady plasma profiles, particularly for drugs with short half-lives, reduction in systemic side effects and enhanced therapeutic efficacy. This review article covers a brief outline of the transdermal drug delivery system; Highlight the restrictions, drawbacks, shortcomings, and Versatile benefits of delivery systems.

The objective of this review article is to summarize literature data pertinent to potential excipient effects on intestinal drug permeability and transit. Despite the use of excipients in drug products for decades, considerable research efforts have been directed towards evaluating their potential effects on drug bioavailability. Potential excipient concerns stem from drug formulation changes (e.g., scale-up and post-approval changes, development of a new generic product). Regulatory agencies have established in vivo bioequivalence standards and, as a result, may waive the in vivo requirement, known as a biowaiver, for some oral products. Biowaiver acceptance criteria are based on the in vitro characterization of the drug substance and drug product using the Biopharmaceutics Classification System (BCS). Various regulatory guidance documents have been issued regarding BCS-based biowaivers, such that the current FDA guidance is more restrictive than prior guidance, specifically about excipient risk. In particular, sugar alcohols have been identified as potential absorption-modifying excipients. These biowaivers and excipient risks are discussed here.