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suggested by results from clinical trials, Companies are snapping up intellectualproperty rights on much of the modified drugs.

after 16 March, as an example, Concert pharmaceutical drugs of Lexington, ma, Reported outcomes of a phase I clinical trial for a version of the antidepressant paroxetine, Sold as Seroxat by GlaxoSmithKline cheap snapbacks and first offered for sale under that trade name in 1992. Concert's version swaps out one or two of the hydrogen atoms in the paroxetine structure (start to see 'Drug modifications') to receive deuterium, A heavier isotope of hydrogen featuring a proton and a neutron, and not just a proton. The company was testing this deuterated version for treating hot flushes without the side effect of standard paroxetine the place that the liver enzyme CYP2D6 is inactivated. since this enzyme metabolizes many other drugs, Inactivating it means it is hard to take other drugs and the paroxetine.

In Concert's lawsuit, 94 women tested paroxetine both standard and deuterated versions along with the cough medicine dextromethorphan, Which is digested by CYP2D6. Taken with routine paroxetine, Metabolic uptake of the cough medicine is inhibited, states that Roger Tung, leader at Concert. never the less, The deuterated version showed less metabolic inhibition suggesting that the drug might be better to match others.

theoretically, Deuterated drugs can work differently elsewhere in the body because deuterium can make stronger chemical bonds than hydrogen. This can affect how quick a drug is broken down.

Another company working with deuteration is Auspex prescriptions, headquartered in Vista, the state of california. Last september, Auspex publicised phase I clinical trial results with a deuterated version of venlafaxine. Venlafaxine was first caused Wyeth, here in 1993, since antidepressant Effexor. The trial suggested that the deuterated version of the drug stayed in the bloodstream longer than the nondeuterated version and may even cause fewer aspect effects, informs me Mike Grey, chief executive of Auspex.

the particular organization already has a patent on its deuterated version of venlafaxine, And has filed more than 150 other US patents on categories of deuterated drugs. Concert has filed more than 100 US patent applications and has brought two notices of allowance already, And is h