There is on-going development of generic EU CTD Dossier of Quetiapine, tablets, 25/100/150/200/300 mg.
Development of this pharmaceutical is carried out according to EU-requirements in country without patent protection or with Bolar-provisions. There will be no sales in those countries where this offer would constitute an infringement of third parties intellectual proprietary rights.
Quetiapine is an antagonist at multiple neurotransmitter receptors in the brain: serotonin 5HT1A and 5HT2 (IC50s=717 & 148nM respectively), dopamine D1 and D2 (IC50s=1268 & 329nM respectively), histamine H1 (IC50=30nM), and adrenergic a1 and a2 receptors (IC50s=94 & 271nM, respectively). Quetiapine has no appreciable affinity at cholinergic muscarinic and benzodiazepine receptors (IC50s>5000 nM).
The mechanism of action of Quetiapine, as with other drugs having efficacy in the treatment of schizophrenia and acute manic episodes associated with bipolar disorder, is unknown. However, it has been proposed that this drug’s efficacy in schizophrenia is mediated through a combination of dopamine type 2 (D2) and serotonin type 2 (5HT2) antagonism. Antagonism at receptors other than dopamine and 5HT2 with similar receptor affinities may explain some of the other effects of Quetiapine.
Quetiapine antagonism of histamine H1 receptors may explain the somnolence observed with this drug.
Quetiapine antagonism of adrenergic a1 receptors may explain the orthostatic hypotension observed with this drug.
More details at http://www.rxlist.com/cgi/generic2/quetiap.htm
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