Nanosuspension as a Novel Nanovehicle for Drug Delivery: A Recent Update on Patents and Therapeutic Applications

Solubility is a critical factor for the therapeutic action of drugs and does not depend on the administration of routes. Various conventional methods are used to enhance the solubility of the drug, which show limited applicability. Nanotechnology is used to improve the solubility and bioavailability of drugs that belong to BCS classes II and IV. Nanosuspension is the dispersion of pure drug nanoparticles in aqueous with a minimum amount of surfactant, stabilizing the formulation. Various techniques, such as the bottom-up approach, dissocubes, nanopure, nanoedge, nanojet process, supercritical fluid, dry co-grinding, milling media, and nanoprecipitation, have been used to formulate nanosuspension. Nanosuspension can be administered orally, inhalation, transdermal, ocular, injectable, topical, and pulmonary. To resolve the problem of solubility and stability, nanosuspension has received much attention because of its technical simplicity, costeffectiveness, and ease of significant scale-up. Nanosuspension can control particle size surface charge properties and release the drug at specific sites at an optimal rate. Recently, more than 100 patents have been published on nanosuspension. This review article covers the different preparation methods, formulation composition, marketed products, characterization, and recent patents on nanosuspension. The various benefits and evaluation of the parameters of nanosuspension are discussed briefly. This patent-based review will enhance the knowledge of control drug delivery and related patents on nanosuspension.