Quote:
Originally Posted by littlecindy 
can reduce the rate of uptake of cocaine and slow the high
by blocking the synapses or filling them so the drugs can't get "in." like methadone, it basically blocks the receptors that make one high, and gives you a lesser buzz than heroin would. probably not that unlike how an antidepressant changes how the uptake of seratonin in your brain, but in the reverse?
how they could do this with a one-time shot, i have no idea. a pill, a recurring shot (like methadone) maybe.
i still don't like it...
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It's not a vaccine against neurotransmitter receptors/reuptake receptors/neurotransmitters. It's a vaccine against cocaine itself (or nicotine or meth or heroin). Basically, the vaccine is an inactivated cholera toxin adjuvant (immune stimulator) hooked up to a derivative of the cocaine molecule. The immune system gets aggravated by the cholera toxin and makes antibodies against both the cholera toxin and the cocaine molecule. It's not a drug against sensations or normal functioning of the brain (the Time article seems to be worried that the nicotine vaccine could have cross-reactivity with the natural acetylcholine neurotransmitter, but they are pretty different molecules).
There are three reasons why this vaccine is not so effective (many boosters, etc. are required). One, because this vaccine is being tested in a country where almost nobody has cholera or has been vaccinated against cholera, two vaccine doses are needed in order to get the immune system good and pissed off about the cholera toxin and make antibodies against it and cocaine. Two, the cocaine molecule itself is pretty small and doesn't really bother the immune system a whole lot. Most good antibodies are against big things that you would find on pathogens - proteins or complex sugars. So to keep the levels of antibodies up, patients have to keep being boosted. Three, your immune system is good, but it's not
that good. For this vaccine to be effective, it has to stop the cocaine from getting to the brain. For moderate/high addiction, the immune system has to clear out a typical dose of 50-100 mg of cocaine in a matter of minutes, if not seconds (that is a
lot for it to handle). If you don't want to quit, you're just going to up your cocaine dose to where your immune system can't clear it out it in time.
As someone who has tried to quit smoking a few times, using the patch, etc., I have to say that making the drug not affect you (which happens when you use the patch) goes a long way in terms of prolonging the quitting behavior. If you slip and have a cigarette but it doesn't do anything, you feel terrible about slipping plus you don't even get the rush. This cocaine vaccine does not sound like a cure-all and will have to be paired with counseling for effective treatment. But it did make counseling twice as effective, and let's face it here, these types of vaccines are out there to try to stop some pretty profoundly unhealthy behavior.