All,
After six weeks of TSM, I have decided to combine baclofen with naltrexone. During the past six weeks my average daily intake has increased substantially. I have experienced very strong feelings of depression which I have never felt previously. I have also had persistent muscle tension that I have only recently connected with TSM. I believe these are symptoms of a protracted alcohol withdrawal. Both should be improved with baclofen, which is a muscle relaxant as well as an antidepressant. My goals over the next several months are to decrease weekly units to 14 or less. I do not desire total abstinence in the near term. I firmly believe that extinction is a cure for alcohol addiction, and I am committed to this outcome. I simply want to use baclofen to bring my drinking to safer and more manageable levels. I'll report weekly progress in this thread. I visited my GP yesterday, well armed with half a dozen journal articles and Ameisen's book. My GP is a jewel, and wrote me a script for baclofen that will allow me to follow the high dosage approach if and when I decide to do that. My first day was nothing short of astounding. I took three 5mg dosages; no side effects or sleepiness, but a very tranquil feeling. More interestingly, I only had three units last night, and did not finish the third. This could be a placebo effect, but it was very encouraging. I did not sleep well, but was so tranquil that I did not care. I'll titrate as follows: 3 days at 15mg, then three days at 30mg. If this is enough to reduce my intake to a safe level, then I'll stop there for a few months. I will of course continue to take naltrexone one hour before drinking. NEUROLIGICAL MODEL It helps me to have a model in mind for how baclofen and naltrexone might interact together. What follows is a concise summary of what I have tried to piece together from a variety of sources. Neuroscience is very complicated, and this is undoubtedly over simplified. Corrections and suggestions are welcome. I apologize for the many acronyms, but they are unavoidable. Alcohol affects the brain in many ways. Three important effects involve release of endorphins, gamma amino butyric acid neurotransmitters (GABA NT), and the glutamate neurotransmitter. As described in Eskapa's book, endorphins affect the brain's pleasure centers, causing a conditioned response to drink again. The GABA NT has a sedating effect on the brain. For example, Valium mimics the GABA NT much like morphine mimics endorphins. Glutamate NT's are released to counter the sedating effects of GABA. Naltrexone blocks the opioid effect of alcohol, but does nothing to affect the GABA or glutamate response. That's where baclofen comes in.
The GABA NT has two kinds of receptor sites: GABA(A) and GABA(B). When a GABA NT attaches to a GABA(A) receptor, sedation occurs. Alcohol facilitates this process (i.e. is a GABA(A) agonist), producing the sedation of the alcohol high. Too much GABA decreases muscle coordination, and to correct for this the brain releases the stimulant glutamate. The GABA(B) receptor is a glutamate throttle; engineers refer to this as negative feedback. Baclofen is a GABA_B agonist, that is, it facilitates attachment of GABA NT's to GABA_B receptors. This reduces further production of glutamate, which decreases anxiety and other effects associate with alcohol withdrawal, and in fact withdrawal from many addictive substances.
Alcoholics that respond more to alcohol's endorphin response do well with TSM. I suspect that these folks include bingers that chase the buzz. Alcoholics that are more attached to the sedating GABA effects of alcohol (e.g. Ameisen) are less responsive to naltrexone; these folks respond better to baclofen. Combining naltrexone and baclofen blocks both responses. Ameisen has an interesting idea that a newly discovered NT called GHB might play a role in alcohol addiction. It is similar to baclofen in that it is a GABA_B agonist. People who have a GHB deficiency might be especially susceptible to alcoholism and also to baclofen as a treatment.
The stimulant glutamate is responsible for most aspects of craving and withdrawal. Alcohol blocks the glutamate receptor (NMDA receptor) and over time this results in more receptors (upregulation). When the alcoholic stops drinking, glutamate production continues, producing the jitters, craving and anxiety of alcohol withdrawal. Campral works by reducing the production of glutamate. Valium mimics the GABA NT, and thus also counters the effects of glutamate. Baclofen reduces glutamate which reduces anxiety and other symptoms of withdrawal. Upregulation of glutamate receptors is also largely responsible for development of alcohol tolerance. The effects of alcohol on the brain is complex. For example, endorphins release dopamine NT's, which are also responsible for the cocaine high. Alcohol also stimulates release of the serotonin NT, responsible for the high of Ecstasy. Drugs such as morphine, cocaine and Ecstasy that involve a single NT are sometimes called chemical scalpels. Alcohol involves a host of NTs and in this analogy is more like a chemical bomb. The seasoned alcoholic gets positive reinforcement from the pleasurable effects of alcohol, and negative reinforcement from withdrawal symptoms that are relieved by drinking again. Both create the conditioned learning that leads to alcohol addiction. Extinction is the only permanent cure that is currently known.
EXTINCTION
TSM reverses the conditioned response to endorphins. I am hopeful that the same is true for baclofen. In other words, would drinking while taking baclofen produce extinction of the conditioned response to the sedating effects of GABA and to the negative effects of withdrawal? The trouble is, baclofen works too well, so most folks that take it often just stop drinking. Part of this may be due to adopting Ameisen's high dosage approach, which apparently completely eradicates the desire to drink. My fear is that without extinction, one would quickly relapse after stopping baclofen treatment, especially if the alcoholic is a GABA drinker that is particularly conditioned to desire the sedating effects of alcohol. As I proceed, I will titrate up to a baclofen dosage high enough to reduce intake, but then titrate back down to a level where I can drink very moderately with AF days interspersed. That's my plan anyway. I'll post my progress.
-wort
_________________ TSM started 1/22/2010; Wks 1-6: 78u/wk Baclofen + TSM started 3/5/10; Wks 7-25: 52u/wk Alcohol free (more or less) and indifferent since 7/15/2010
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