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Rabeprazole

Rabeprazole is an antiulcer drug in the class of proton pump inhibitors. It belongs to a class of antisecretory compounds.It is a prodrug in the acid environment of the parietal cells it turns into active sulphenamide form.It is used for the treatment of acid-reflux disorders (GERD), peptic ulcer disease, H. pylori eradication, and prevention of gastroinetestinal bleeds with NSAID use.Rabeprazole inhibits the H+, K+ATPase of the coating gastric cells and dose-dependent oppresses basal and stimulated gastric acid secretion.

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Raclopride

Raclopride is a synthetic compound that acts as an antagonist on D2 dopamine receptors. It can be radiolabelled with the carbon-11 radioisotope and used in positron emission tomography scanning to assess the degree of dopamine binding to the D2 dopamine receptor.

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Radafaxine

Radafaxine is drug investigated for treatment of restless leg syndrome and as an NDRI antidepressant. Presently in various clinical trials, radafaxine is being studied as a treatment for clinical depression, obesity, and neuropathic pain.

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Raloxifene

Raloxifene is an oral selective estrogen receptor modulator that has estrogenic actions on bone and anti-estrogenic actions on the uterus and breast. It is used in the prevention of osteoporosis in postmenopausal women. In 2006, the National Cancer Institute announced that raloxifene was as effective as tamoxifen in reducing the incidence of breast cancer in postmenopausal women at increased risk.

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Raloxifene Hydrochloride

Raloxifene hydrochloride is an estrogen agonist/antagonist, commonly referred to as a selective estrogen receptor modulator (SERM) that belongs to the benzothiophene class of compounds.

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Raltegravir

Raltegravir is prescribed in combination with other medications to treat human immunodeficiency virus (HIV) in patients with acquired immune deficiency syndrome. It belongs to a class of medications called integrase inhibitors which work by blocking the action of integrase, an enzyme responsible for spreading the HIV virus in the body.

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Raltitrexed

Raltitrexed is an antimetabolite drug used in cancer chemotherapy. It is an inhibitor of thymidylate synthase. Raltitrexed belongs to a group of medicines known as antimetabolites. It is used to treat cancer of the colon and rectum. It may also be used to treat other kinds of cancer, as determined by your doctor. Raltitrexed blocks an enzyme needed by the cell to live. Raltitrexed is an antineoplastic Agents and folic acid antagonists. Raltitrexed inhibits thymidylate synthase (TS) leading to DNA fragmentation and cell death. It is transported into cells via a reduced folate carrier.

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Ramelteon

Ramelteon is the first in a new class of sleep agents that selectively binds to the MT1 and MT2 receptors in the suprachiasmatic nucleus (SCN), instead of binding to GABA A receptors, such as with drugs like zolpidem, eszopiclone, and zaleplon. Ramelteon is approved by the U.S. Food and Drug Administration (FDA) for long-term use.

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Ramipril

Ramipril is a prodrug belonging to the angiotensin-converting enzyme (ACE) inhibitor class of medications. It is metabolized to ramiprilat in the liver and, to a lesser extent, kidneys. Ramiprilat is a potent, competitive inhibitor of ACE, the enzyme responsible for the conversion of angiotensin I (ATI) to angiotensin II (ATII). Ramipril may be used in the treatment of hypertension, congestive heart failure, nephropathy, and to reduce the rate of death, myocardial infarction and stroke in individuals at high risk of cardiovascular events.

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Ramosetron

Ramosetron is used for the treatment of nausea and vomiting. Ramosetron is also indicated for a treatment of “diarrhea-predominant irritable bowel syndrome in males”.In India it is marketed under the brand name of "IBset".

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