Stories
Slash Boxes
Comments

SoylentNews is people

posted by martyb on Friday April 07 2017, @05:09AM   Printer-friendly
from the receives-glowing-reviews dept.

The first deuterated drug has finally been approved by the FDA. It's Austedo (deutetrabenazine), from Teva, and it targets Huntington's chorea. This is an interesting development on several levels. The idea of adding deuteriums (instead of plain hydrogens) to drug structures had been kicking around for many years, but only in the last 8 or 10 years has serious development been underway on them.

[...] Deuterium is the (fairly well known) "heavy hydrogen" isotope of regular hydrogen, which is heavy because it has another neutron in it. That basically doubles its weight (the single electron in the atom is a roundoff error in that regard), so these two are an isotope pair with a large percentage difference in weight indeed.
[...] The reason this weight difference makes a difference is when a bond breaks between the hydrogen (or deuterium) and another atom. The bond is actually harder to break with the heavier isotope, an effect that can be modeled surprisingly well with springs and fishing weights. This is the "primary kinetic isotope effect", and if that bond-breaking is an important step in some process, you can slow the whole works down by just putting in a D where an H used to be. For drugs, the key is that many of them are metabolized and destroyed when they hit they liver, and this is often done through breaking a C-H bond. So a well placed deuterium (or two, or three) can actually have a significant effect on how long a drug will circulate in the bloodstream, by slowing down the liver's clearance mechanism.

http://blogs.sciencemag.org/pipeline/archives/2017/04/04/the-first-deuterated-drug-arrives
https://en.wikipedia.org/wiki/Deuterium
https://en.wikipedia.org/wiki/Tetrabenazine


Original Submission

 
This discussion has been archived. No new comments can be posted.
Display Options Threshold/Breakthrough Mark All as Read Mark All as Unread
The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.
  • (Score: 2) by bob_super on Saturday April 08 2017, @12:48AM

    by bob_super (1357) on Saturday April 08 2017, @12:48AM (#490631)

    One more vote for the "you must be fun at parties" mod...

    Starting Score:    1  point
    Karma-Bonus Modifier   +1  

    Total Score:   2