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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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Ranitidine is a histamine H2-receptor antagonist that inhibits stomach acid production. It is commonly used in treatment of peptic ulcer disease (PUD) and gastroesophageal reflux disease (GERD). Ranitidine is also used alongside fexofenadine and other antihistamines for the treatment of skin conditions such as hives. Ranitidine is also known to give false positives for methamphetamine on drug tests.

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Ranolazine is an antianginal medication. On January 31, 2006, ranolazine was approved for use in the United States by the FDA for the treatment of chronic angina pectoris. It may be used with beta-blockers, nitrates, calcium channel blockers, anti-platelet, therapy, lipid-lowering therapy, ACE inhibitors, and angiotensin receptor blockers. It has been shown to decrease angina episodes in individuals with coronary artery disease on maximal doses of amlodipine. In addition, it has been shown to both decrease angina episodes and increase exercise tolerance in individuals taking concomitant atenolol, amlodipine, or diltiazem.

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Rebastinib is a unique switch-pocket, non-ATP competitive (allosteric) inhibitor with IC50 at low nanomolar concentration against a number of tyrosine kinases. It has shown promising activity in a phase I/II clinical trial in chronic myeloid leukemia (CML), where plasma concentrations of 350 nM of DCC-2036 have been safely achieved.

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Reboxetine is an antidepressant drug used in the treatment of clinical depression, panic disorder and ADD/ADHD. Its mesylate (i.e. methanesulfonate) salt is sold under tradenames including Edronax, Norebox, Prolift, Solvex, Davedax or Vestra.Reboxetine is a selective inhibitor of noradrenaline reuptake. It inhibits noradrenaline reuptake in vitro to a similar extent to the tricyclic antidepressant desmethylimipramine. Reboxetine does not affect dopamine or serotonin reuptake and it has low in vivo and in vitro affinity for adrenergic, cholinergic, histaminergic, dopaminergic and serotonergic receptors.Symptoms of overdose include seizures (rare).


Reclazepam is a drug which is a benzodiazepine derivative. It has sedative and anxiolytic effects similar to those produced by other benzodiazepine derivatives, and has a short duration of action.


Rentiapril is an ACE inhibitor. Angiotensin-converting enzyme(ACE) inhibitors are a group of drugs used primarily for the treatment of hypertension and congestive heart failure.

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