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Anagliptin is a pharmaceutical drug for the treatment of type 2 diabetes mellitus. Anagliptin belongs to the class of anti-diabetic drugs known as dipeptidyl peptidase-4 inhibitors or "gliptins".

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Anagrelide is a drug used for the treatment of essential thrombocytosis, or overproduction of blood platelets. It also has been used in the treatment of chronic myeloid leukemia.

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Aniracetam is an ampakine and nootropic of the racetam chemical class purported to be considerably more potent than piracetam. It is lipid soluble and has possible cognition enhancing effects.

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Antipyrine is an analgesic and antipyretic. It was first synthesized by Ludwig Knorr in 1883. It is formed by reducing diortho- dinitrodiphenyl with sodium amalgam and methyl alcohol, or by heating diphenylene-ortho-dihydrazine with hydrochloric acid to 150 °C.

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Apaziquone is an indolequinone that is a bioreductive prodrug and a chemical analog of the older chemotherapeutic agent mitomycin C. In hypoxic cells, such as those on the inner surface of the urinary bladder, apaziquone is converted to active metabolites by intracellular reductases. The active metabolites alkylate DNA and lead to apoptotic cell death. This activity is preferentially expressed in neoplastic cells. It has been applied in clinical studies for the treatment of superficial bladder cancer.

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Apremilast is a novel, orally available PDE4 inhibitor that inhibits spontaneous TNFα production from human rheumatoid synovial membrane cultures, ex-vivo, with similar efficacy to rolipram.

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Arfendazam is a drug which is a benzodiazepine derivative. It is a 1,5-benzodiazepine, with the nitrogen atoms located at positions 1 and 5 of the diazepine ring, and so is most closely related to other 1,5-benzodiazepines such as clobazam. It has sedative and anxiolytic effects similar to those produced by other benzodiazepine derivatives, but is a partial agonist at GABAA receptors, so the sedative effects are relatively mild and it produces muscle relaxant effects only at very high doses. It produces an active metabolite lofendazam, which is thought to be responsible for part of its effects.


Artemether is an antimalarial for the treatment of multi-drug resistant strains of falciparum malaria. It is a methyl ether derivative of artemisinin, which is a peroxide lactone isolated from the Chinese antimalarial plant, Artemisia annua. Artemether is highly effective against the blood schizonts of both malarial parasites P. falciparum and P. vivax. It is applied in combination with lumefantrine in clinical treatments of malaria. Artemether has been shown to have significant anticancer and antitumor activities. It is demonstrated that artemether caused strong inhibitory effects on brain glioma growth and angiogenesis in rats. It exhibits a dose- and time-dependent cytotoxicity, and induced apoptosis and G2 cell cycle arrest in ovarian cancer cell lines, human leukemia HL60 cells, and human pancreatic cancer BxPC-3 and AsPC-1 cells.

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Arzoxifene is a selective estrogen receptor modulator. It is a potent estrogen antagonist in mammary and uterine tissue while acting as an estrogen agonist to maintain bone density and lower serum cholesterol. It is a highly effective agent for prevention of mammary cancer induced in the rat by the carcinogen nitrosomethylurea and is significantly more potent than raloxifene in this regard. It is devoid of the uterotrophic effects of tamoxifen, suggesting that, in contrast to tamoxifen, it is unlikely that the clinical use of arzoxifene will increase the risk of developing endometrial carcinoma.

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