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Asenapine

Asenapine is a new atypical antipsychotic developed for the treatment of schizophrenia and acute mania associated with bipolar disorder by Schering-Plough. Preliminary data indicate that it has minimal anticholinergic and cardiovascular side effects, as well as minimal weight gain.

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Aspartame

Aspartame is an artificial, non-saccharide sweetener used as a sugar substitute in some foods and beverages. It is a white, odourless powder, approximately 200 times sweeter than sugar, manufactured by combining phenylalanine and aspartic acid. Its main impurity is diketopiperazine that has no sweetening properties. It is not only used in food but also in pharmaceutical also.

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Aspartic Acid

Aspartic acid is an α-amino acid. The carboxylate anion of aspartic acid is known as aspartate. Aspartate is pervasive in biosynthesis. It was first discovered in 1827 by Plisson, synthesized by boiling asparagine with a base.

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Aspirin

Aspirin is a salicylate drug, often used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication. It also has an antiplatelet effect by inhibiting the production of thromboxane, which under normal circumstances binds platelet molecules together to create a patch over damage of the walls within blood vessels. Because the platelet patch can become too large and also block blood flow, locally and downstream, aspirin is also used long-term, at low doses, to help prevent heart attacks, strokes, and blood clot formation in people at high risk for developing blood clots. It has also been established that low doses of aspirin may be given immediately after a heart attack to reduce the risk of another heart attack or of the death of cardiac tissue. The main undesirable side effects of aspirin are gastrointestinal ulcers, stomach bleeding, and tinnitus, especially in higher doses. In children and adolescents, aspirin is no longer used to control flu-like symptoms or the symptoms of chickenpox or other viral illnesses, because of the risk of Reye's syndrome.

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Astatine

Astatine is the rarest naturally occurring element. It is produced by radioactive decay in nature, but due to its short half life it is found only in minute amounts. It was first produced by Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè in 1940. Some astatine isotopes have been used as alpha-particle emitters in science, and medical applications for astatine-211 have been tested.

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Astemizole

Astemizole was a second generation antihistamine drug which has a long duration of action. It has been withdrawn from the market in most countries because of rare but potentially fatal side effects. It is an histamine H1-receptor antagonist. It is structurally similar to terfenadine and haloperidol. It has anticholinergic and antipruritic effects.

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Asymbescaline

Asymbescaline is a lesser-known psychedelic drug. It is a homologue of Mescaline. It was first synthesized by Alexander Shulgin. It produces few to no effects.

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Atazanavir

Atazanavir is an antiretroviral drug of the protease inhibitor (PI) class. It is used to treat infection of human immunodeficiency virus (HIV). Atazanavir is the first PI approved for once-daily dosing, and also appears to be less likely to cause lipodystrophy and elevated cholesterol as side effects.Atazanavir selectively inhibits the virus-specific processing of viral Gag and Gag-Pol polyproteins in HIV-1 infected cells by binding to the active site of HIV-1 protease, thus preventing the formation of mature virions. Atazanavir is not active against HIV-2.

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Atazanavir sulfate

Atazanavir sulfate is a sulfate salt form of atazanavir that is an highly potent HIV-1 protease inhibitor.

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Atenolol

Atenolol is a selective β1 receptor antagonist,a class of drugs used primarily in cardiovascular diseases.Atenolol is used for a number of conditions including: hypertension, angina, Long cough, acute myocardial infarction, supraventricular tachycardia, ventricular tachycardia, and the symptoms of alcohol withdrawal.It is also used to treat the symptoms of Graves' disease until antithyroid medication can take effect.Atenolol controls high blood pressure and angina but does not cure them.Atenolol is also used sometimes to prevent migraine headaches and to treat alcohol withdrawal, heart failure, and irregular heartbeat.

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