• N&PD Moderators: Skorpio | someguyontheinternet

Opioids and GABA-B agonists

^^I've noticed similar effects on my libido from baclofen when I initiated therapy, taking prescribed doses of 60mg/day for roughly two days (before the negative effects realized themselves roughly 24-36 hours later- causing hourly vomiting; severe agaxia; etc.. all of which resulted me in completely STOPPING baclofen & then reintroducing it about 3 days later at very low doses). Conversely, Im weaning down and having opposite effects at doses 20mg or less per day. It sedates the shit out of me: almost like an opiate nod but w/o the euphoria... and the baclofen sedative effects will result in actual sleep, rather than a nod, for roughly 1-3 hours. Again, i'm talking about effects from my experience & the dose I am currently at.
 
I'm not even going to bother responding to 18 and 19. Half of what was written is worthless, the questions from the 1st paragraph of 18 have self evident answers. I don't think it's an issue of unfamiliarity with Gabapentins pharmacokinetics but pharmacokinetics in general. Learn how AUC is measured- perhaps just what it means- and you'll understand why none of this quote is relevant-

Since I don't have the PI sheet, could you explain how they deduced gabapentin "decreased" the effects of opioids via affecting BA? From In Vivo or In Vitro research? Or just a clinical observation from double-blind studies? If the latter is true, how does this mean it is a function of bioavailability? ..And not a function of pharmacological interaction? Call me naive, but I don't know much on the pharmacokinetics of gabapentin.

Also, take two seconds and drive to your nearest Walgreens, they're everywhere, and ask for a copy. They will have no problem giving you a copy of the PI sheet. Or learn how to use google and download a copy. It shouldn't be too hard to find.

Additionally, PI sheets are FDA approved, and the manufacturer was sued because their sales staff promoted it for conditions it wasn't approved for. That's entirely irrelevant to what their researchers produced. I don't see where it was claimed to have a direct effect on GABA, it's certainly not a claim they made in the research.

So... yeah, this was a big waste of time and this is exactly the garbage that pollutes this subforum. That's why all of the really good activity that used to be centered here has left.

Oh! The hilarity of asking for sources and then basically saying that you prefer your own subjective experience.
correct me (with sources) if i'm most obviously wrong.
You are, and I already did.

The fact that gabapentin allows you to reduce an opioid dosage can be, and almost certainly is, unrelated to it's effect on the BA of opioids. That's fairly obvious. If I were in withdrawal right now, I'd be gobbling down Gabapentin, that's for sure. It definitely does seem to reduce the desire to consume opioids as well. Just a personal experience, but actual science shows us that if you do co-administrate your opioids (as far as I'm aware, only the standard phenanthrene opioids like hydrocodone and morphine) their bioavailability will be reduced.
 
Where have you been? The discussion has gone on quite adequately.. except when I keep asking questions from you & you keep (and continue to) dodge them. There is a difference between constructive criticism--if you can call it that--between personal attacks, ya know. My deepest apologies to damage your ego, sheesh.

Anyway- a google search? did it, & at least w/ my search engine skills, I found no PI sheet. & this is ADD forums.. where you give sources to back up claims. You made a claim in their PI search, so I was merely asking for a link to their PI sheet. My personal experience was represented just as that, a personal experience; not a pharmacokinetical, pharmacodynamical, or pharmacological claim.

And never said that gabapentin was claimed to be a direct gabaergic in Pfizer's PI sheet. But it's chemical similarity to GABA definitely was the reason it was first synthesized as a medication. Keep it up, me having to respond to all your questions pretty irrelevant to this thread and the ONE question I keep asking of you... & i'm sure this thread will get closed. Back in the old days, 2004, 2005ish & it would've promptly been closed w/ your last post. But, I suppose things change. People aren't as hostile as they used to be here; although, you'd fit in well back then :p if you would have been a member.

I don't want to take away from the GABA-b agonist discussion & the OPer's question, so how about we drop this?
 
Well, I've been here four years now, and managed to contribute more than twice as much in virtually one subforum... here.
Keep it up, me having to respond to all your questions pretty irrelevant to this thread and the ONE question I keep asking of you
And what question did I ask you? I didn't ask you any questions, I'm not interested in anything you have to say. The one question you asked me was answered before you even asked it. The form of the information I provided in the quote from the PI sheet answered everything you asked for.

You couldn't find the PI sheet? That's either a bold faced lie, or I'm drowing in retardary. I found two editions of it, one generic for gabapentin from Neurontin, and a more recent version for Gralise, I'm pretty sure I could find it for Horizant too, but I'm gonna leave it at two. I've already put more effort into finding it than you have (what, did you not get off of Google's first results page? not even that far maybe??). All you had to do was search "prescribing information + neurontin (or gralise or horizant)." AND BLAMMOO! It's in the top three results for all of them! But again, I'll spoon-feed you the information, because for whatever reason, that's what you're looking for.

Even more ridiculously, is that I've already quoted from this earlier..

http://labeling.pfizer.com/ShowLabeling.aspx?id=630

Hydrocodone: Coadministration of Neurontin (125 to 500 mg; N=48) decreases hydrocodone
(10 mg; N=50) Cmax and AUC values in a dose-dependent manner relative to administration of
hydrocodone alone; Cmax and AUC values are 3% to 4% lower, respectively, after administration
of 125 mg Neurontin and 21% to 22% lower, respectively, after administration of 500 mg
Neurontin. The mechanism for this interaction is unknown. Hydrocodone increases gabapentin
AUC values by 14%. The magnitude of interaction at other doses is not known


http://www.gralise.com/lib/PDFS/GRALISE_PI.pdf


7.6 Hydrocodone
Coadministration of gabapentin immediate release (125 mg and 500 mg) and hydrocodone
(10 mg) reduced hydrocodone Cmax by 3% and 21%, respectively, and AUC by 4% and 22%,
respectively. The mechanism of this interaction is unknown. Gabapentin AUC values were
increased by 14%; the magnitude of the interaction at other doses is not known.


I'm confused. In one post you say
It was also originally claimed that gabapentin modulated GABA receptors
To which I said: " it's certainly not a claim they made in the research."
In another you say
And never said that gabapentin was claimed to be a direct gabaergic in Pfizer's PI sheet. But it's chemical similarity to GABA definitely was the reason it was first synthesized as a medication.
While you're right you didn't say that it was in the PI sheet, you were claiming that they misrepresented what it did, and what you did say was entirely irrelevant and as far as i can tell, untrue. The last bit is vague and relatively meaningless. It was synthesized as part of a large group of compounds exploring the effects of gaba analogues.

Where have you been?
I tried biting my tongue. I failed, okay.
The discussion has gone on quite adequately
Really? Three posts had occurred, two were you, and another, from amanitadine (for whom i do have respect for), who summarized all of that up quite well as
worthless subjective descriptions

"almost like an opiate nod but w/o the euphoria", "actual sleep, rather than a nod" - so sleep, no euphoria, like a nod, but not like a nod?

I can see why you're not following between posts... sentences are tough.

I don't want to take away from the GABA-b agonist discussion & the OPer's question


Whhaaaatttt? Really? You haven't touched on the OP's question. You've just rambled about your experiences with baclofen. I didn't realize this subforum was about half answering questions with anecdotal evidence that vaguely relates to the question? Maybe this should be the "share short blurbs about the times you've taken baclofen thread" - I haven't heard anything about GABA-B agonists combined with opioids.

Unfortunately most of these comments just need a pubchem or med search and that's about all you can get without venturing into all of this subjective crap. At least you could confine it to actual combinations of gaba-b agonists and opioids. one or the other doesn't really provide any information.
 
Short blurb...

60mg Baclofen allowed me to go from 2-3x \ day heroin use to once per week. When I would use the stimulating \ reinforcing part of opiates initial effects was substantially blunted. I stopped dabbling with alcohol & cocaine completely, & found the thought of those drugs repulsive.
 
can someone answer the question??

will gaba-b agonists decrease or increase the euphoric/sedative properties of opiates?
 
You think phenibut does? Hmm... the euphoric or just the sedative aspects?

I wonder if those two show positive results because they're so messy?
 
Baclofen has been awesome for me. I could have cocaine in my hand and not immediately think about how I could get money and score. I found almost $2000 in cash while on it (my roommate's, she was out of town), and was able to laugh about my thoughts of spending it on cocaine and hookers. I ran out early though, and the doctor was gone, with the nurse making it too difficult to explain my situation and get more. The same day that I ran out, I got OVERWHELMING cravings for coke, and took all that damn money. Unbelievable, I'm convinced baclofen is an essential part of my addiction management program along with Vivitrol.

I wanted to post that, and also respond to the article about modafinil and its interaction with GABA-b ant/agonists. It's a bit out of my realm of understanding, but I find it VERY intriguing that baclofen actually INCREASED dopamine release caused by modafinil. That makes me even more excited to try it out!!! If I do manage to get on that combo, I'll be sure to post something about it and my subjective results.

Cheers.
 
After being on a regime of 3-4 codeine 30mg(to start- later escalating to 30s), ULD NLTX, and high daily doses of gabapentin/lyrica actually held back tolerance buildup.

How? Apparently gabapentin/lyrica are histone deacetylase inhibitors- stopping epigenetic transcription of tolerance from the beginning- gabapentin/lyrica along with ethanol, baclofen, etc all do this http://en.wikipedia.org/wiki/Histone_deacetylase_inhibitor

Along with this they share extremely dirty pharmacological profiles inhibiting many GABA-ergic mechanisms and causing increased density of GABA and DA through indirect mechanisms

Lyrica (pregabalin) binds with high affinity to the alpha2-delta site (an auxiliary subunit of voltage-gated calcium channels) in central nervous system tissues. Although the mechanism of action of pregabalin is unknown, results with genetically modified mice and with compounds structurally related to pregabalin (such as gabapentin) suggest that binding to the alpha2-delta subunit may be involved in pregabalin's antinociceptive and antiseizure effects in animal models. In vitro, pregabalin reduces the calcium-dependent release of several neurotransmitters, possibly by modulation of calcium channel function.

While pregabalin is a structural derivative of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA), it does not bind directly to GABAA, GABAB, or benzodiazepine receptors, does not augment GABAA responses in cultured neurons, does not alter rat brain GABA concentration or have acute effects on GABA uptake or degradation. However, in cultured neurons prolonged application of pregabalin increases the density of GABA transporter protein and increases the rate of functional GABA transport. Pregabalin does not block sodium channels, is not active at opiate receptors, and does not alter cyclooxygenase enzyme activity. It is inactive at serotonin and dopamine receptors and does not inhibit dopamine, serotonin, or noradrenaline reuptake.

Gabapentin is structurally related to the neurotransmitter GABA (gamma-aminobutyric acid) but it does not modify GABAA or GABAB radioligand binding, it is not converted metabolically into GABA or a GABA agonist, and it is not an inhibitor of GABA uptake or degradation. Gabapentin was tested in radioligand binding assays at concentrations up to 100 µM and did not exhibit affinity for a number of other common receptor sites, including benzodiazepine, glutamate, N-methyl-D-aspartate (NMDA), quisqualate, kainate, strychnine-insensitive or strychnine-sensitive glycine, alpha 1, alpha 2, or beta adrenergic, adenosine A1 or A2, cholinergic muscarinic or nicotinic, dopamine D1 or D2, histamine H1, serotonin S1 or S2, opiate mu, delta or kappa, cannabinoid 1, voltage-sensitive calcium channel sites labeled with nitrendipine or diltiazem, or at voltage-sensitive sodium channel sites labeled with batrachotoxinin A 20-alpha-benzoate. Furthermore, gabapentin did not alter the cellular uptake of dopamine, noradrenaline, or serotonin.

In vitro studies with radiolabeled gabapentin have revealed a gabapentin binding site in areas of rat brain including neocortex and hippocampus. A high-affinity binding protein in animal brain tissue has been identified as an auxiliary subunit of voltage-activated calcium channels. However, functional correlates of gabapentin binding, if any, remain to be elucidated.


Completely different mechanisms of actions- but if you read between the lines the clear culprit here is modulation of histones via deacetylase inhbiition- which explains why they are perfect anti-seizures - which explains why everyone becomes zombies- which opens a new portal of research into these histone deacetylase inhibitors that are not dirty that could dramatically affect tolerance... ex: curcumin


bottom line, gabapentin, xanax, ethanol, etc ALL potentiate opiates AND inhibit tolerance- which is why they are a major implicating factor in most opiate overdose cases- when stopping lyrica and all benzos.. the high i got from hydrocodone/oxycodone, vanished and near double the dose was needed, and it needed to constantly be escalated...very different

however now I am very close to an anti-tolerance opiate stack..
 
bottom line, gabapentin, xanax, ethanol, etc ALL potentiate opiates AND inhibit tolerance- which is why they are a major implicating factor in most opiate overdose cases- when stopping lyrica and all benzos.. the high i got from hydrocodone/oxycodone, vanished and near double the dose was needed, and it needed to constantly be escalated...very different

however now I am very close to an anti-tolerance opiate stack..

You know opiates effect GABA similarly to benzos, right? My impression is that you had some GABA synergism going on and without one of the components your high fell flat.
 
You know opiates effect GABA similarly to benzos, right? My impression is that you had some GABA synergism going on and without one of the components your high fell flat.

You know that's complete nonsense right? By inhibiting cAMP formation, opioids inhibit GABA activity, not enhance it.
 
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