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Oseltamivir, sold under the brand name Tamiflu among others, is an antiviral medication used to treat and prevent influenza A and influenza B, viruses that cause the flu. [5] Many medical organizations recommend it in people who have complications or are at high risk of complications within 48 hours of first symptoms of infection. [ 6 ]
The degree of these effects in horses after intramuscular injection has relatively little support in the current literature. [35] However, there is much anecdotal evidence of their benefits for synovitis and osteoarthritis, and PSGAGs are very commonly used by veterinarians in the United States involved in racehorse and show horse practice. [ 36 ]
Shikimic acid can also be extracted from the seeds of the sweetgum (Liquidambar styraciflua) fruit, [2] which is abundant in North America, in yields of around 1.5%. For example, 4 kg (8.8 lb) of sweetgum seeds is needed for fourteen packages of Tamiflu. By comparison, star anise has been reported to yield 3% to 7% shikimic acid.
An equianalgesic chart is a conversion chart that lists equivalent doses of analgesics (drugs used to relieve pain). Equianalgesic charts are used for calculation of an equivalent dose (a dose which would offer an equal amount of analgesia) between different analgesics. [1]
The current production method is based on the first scalable synthesis developed by Gilead Sciences [4] starting from naturally occurring quinic acid or shikimic acid.Due to lower yields and the extra steps required (because of the additional dehydration), the quinic acid route was dropped in favour of the one based on shikimic acid, which received further improvements by Hoffmann-La Roche.
Oseltamivir (also Tamiflu) is an oral antiviral drug against influenza (flu). It was the second inhibitor of the viral neuraminidase to be developed, after zanamivir, and the first to be taken as an oral tablet. It was originally synthesised from shikimic acid extracted from the star anise plant.
[10] [11] [12] An industrial method for the production of shikimic acid using fermentation of E. coli bacteria was discovered in 2005, [13] [14] and applied in the 2009 swine flu pandemic to address Tamiflu shortages, eventually reversing price increases for star anise as a raw material of shikimic acid. [15]
Aminoshikimic acid is an unnatural carbohydrate, although aminoshikimic acid is the namesake of the aminoshikimate pathway, which generates the 3-amino-5-hydroxybenzoic acid (AHBA) starter unit required for the biosynthesis of the ansamycins and mitomycins. [1]
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