Aim: EPAS (evaporative precipitation into aqueous solution) was used in the current studies to prepare azithromycin nanosuspensions and investigate the physicochemical characteristics for the nanosuspension batches with the aim of enhancing the dissolution rate of the nanopreparation to improve bioavailability. Methods: EPAS method used in this study for preparing azithromycin nanosuspension was achieved through developing an in-house instrumentation method. Particle size distribution was measured using Zetasizer Nano S without sample dilution. Dissolved azithromycin nanosuspensions were also compared with raw azithromycin powder and commercially available products. Total drug content of nanosuspension batches were measured using an Ultra-Performance Liquid Chromatography (UPLC) system with Photodiode Array (PDA) detector while residual solvent was measured using gas chromatography (GC). Results: The average particle size of azithromycin nanosuspension was 447.2 nm and total drug content was measured to be 97.81% upon recovery. Dissolution study data showed significant increase in dissolution rate for nanosuspension batch when compared to raw azithromycin and commercial version (microsuspension). The residual solvent found for azithromycin nanosuspension is 0.000098023 mg/ mL or 98.023 ppb. Conclusion: EPAS was successfully used to prepare azithromycin nanoparticles that exhibited significantly enhanced dissolution rate. Further studies are required to scale up the process and determine long term stability of the nanoparticles.
: COVID-19, a viral disease caused by SARS-CoV-2 is the reason of a global pandemic since the starting of the year 2020. The characteristic of the disease varies from mild common cold like symptoms to acute respiratory distress syndrome and multi-organ failure leading to death. World has already observed 213,453 deaths from this disease while 3,095,839 have been infected in 210 countries in total till 28 April, 2020. This disease has a devastating impact over the health care system because of its high infectivity, easy mode of transmission, lack of proper medicine and vaccine and deficiency of enough supportive healthcare arrangement. On verge of this situation scientists are searching the treatment options. However, nature has provided us with enormous herbs which have disease preventive as well as have medicinal properties. In this article we have reviewed several of these plants (ginger, clove, tea, black seed, tulsi, neem) and some vitamins (vitamin C and vitamin D) and zinc which have antiviral, anti-inflammatory, antioxidant, anti-asthmatic properties with scientific evidence. The intake of these products regularly to keep the immune system active, to experience its positive aspects might be supportive to prevent infection with the new coronavirus or to treat COVID-19.
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