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Protokylol is a β-adrenergic receptor agonist used as a bronchodilator.


Pyridoxine is one of the compounds that can be called vitamin B6,along with pyridoxal and pyridoxamine . Pyridoxine assists in the balancing of sodium and potassium as well as promoting red blood cell production. Pyridoxine may help balance hormonal changes in women and aid the immune system. Lack of pyridoxine may cause anemia, nerve damage, seizures, skin problems, and sores in the mouth.

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Quetiapine is an atypical antipsychotic approved for the treatment of schizophrenia, bipolar disorder and as an add-on to treat depression.Quetiapine is a selective monoaminergic antagonist with high affinity for the serotonin Type 2 (5HT2), and dopamine type 2 (D2) receptors. Quetiapine is an antagonist at serotonin 5-HT1A and 5HT2, dopamine D1 and D2, histamine H1, and adrenergic alpha 1 and alpha 2 receptors. Quetiapine has no significant affinity for cholinergic muscarinic or benzodiazepine receptors. Drowsiness and orthostatic hypotension associated with use of quetiapine may be explained by its antagonism of histamine H1 and adrenergic alpha 1 receptors, respectively. Quetiapine's antagonism of adrenergic a1 receptors may explain the orthostatic hypotension observed with this drug.

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Quinacrine is a drug with a number of different medical applications. It is related to mefloquine. Its main effects are as an antiprotozoal, antirheumatic and an intrapleural sclerosing agent. It is also used "off-label" for the treatment of systemic lupus erythematosus, indicated in the treatment of discoid and subcutaneous lupus erythematosus, particularly in patients unable to take chloroquine derivatives. As an intrapleural sclerosing agent, it is used as pneumothorax prophylaxis in patients at high risk of recurrence.


Quinaldine is used in anti-malaria drugs, in manufacturing dyes, food colorants (e.g. Quinoline Yellow WS), pharmaceuticals, pH indicators. Quinaldine sulfate is an anaesthetic used in fish transportation.

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Qunoxidine is used for treatment of serious purulent inflammatory illnesses such as: pyelitis, pyelocystitis, cholecystitis , cholangitis, pleural empyema, lung abscess, enteric dysbacteriosis, different septic illnesses. Also it gives relief in infections caused by blue pus bacillus, proteus vulgaris, Klebsiella pneumonia, Escherichia, salmonella, staphylococcus, and streptococcus. Qunoxidine affects cultures which are stable to antibiotics and other chemotherapeutical preparations.

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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 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.


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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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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