Definition of cyclosporine
: an immunosuppressive drug C62H111N11O12 that is a cyclic polypeptide obtained as a metabolite from a fungus (Beauveria nivea synonym Tolypocladium inflatum) and is used especially to prevent rejection of transplanted organs and in the treatment of rheumatoid arthritis and psoriasis
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Merriam-Webster unabridged
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Time Traveler for cyclosporine
The first known use of cyclosporine was in 1976
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