Η ΣΕΛΙΔΑ ΓΙΑ ΤΑ 90 ΤΟΥ ΓΕΝΕΘΛΙΑ
ο σερ Αρθουρ Κλαρκ κλεινει τα εννενητα!!!
πειτε του χρονια πολλα, μεσω της ΤΜΤ στη μακρινη Κινα
ΒΙΟΓΡΑΦΙΑ ΚΑΙ ΑΛΛΕΣ ΧΡΗΣΙΜΕΣ ΠΛΗΡΟΦΟΡΙΕΣ
It's metabolised quickly to carbon dioxide and water. GHB's steep dose-response curve means naïve users run the severe risk of falling asleep. When used lightly in recreational rather than stuporific or anaesthetic doses, GHB is a touchy-feely compound which typically induces deep muscular relaxation, a sense of serenity, and feelings of emotional warmth. Often it enhances emotional openness and the desire to socialise. Tactile sensitivity and the appreciation of music are enriched. Most remarkably, the moderate user may awake refreshed after a deep restful sleep: GHB appears temporarily to inhibit dopamine-release while increasing storage, leading to the brightened mood and sharpened mental focus of a subsequent "dopamine-rebound". GHB acts both as a disinhibitor and an aphrodisiac. The intensity of orgasm is heightened. Hence GHB is potentially useful in relieving the psychopathologies of prudery and sexual repression. Unfortunately, its therapeutic value has been eclipsed by its demonization in the mass-media. Stories of chaste virgins turning into sex-crazed nymphomaniacs make great copy and poor scientific medicine. Moreover GHB is sometimes confused with the amnestic "date-rape" benzodiazepine, flunitrazepam - better-known as the potent and fast-acting sedative-hypnotic "forget pill", Rohypnol. Bought on the street, GHB may be confused with all sorts of other substances too.Yet even pure GHB is no magic elixir. Not everyone likes it. GHB's psychological effects are unpredictable and poorly understood. Nausea, dizziness, inco-ordination are common; reaction-time is slowed. GHB does not usually promote great depth of thought. Its very status as "an almost ideal sleep inducing-substance" makes it of limited use to those who aspire instead to be more intensely awake. The lack of any discernible body-count to fuel the periodic moral panics its use induces may allow a partial rehabilitation. Yet GHB evokes - at best - only a faint, fleeting parody of the life-long chemical nirvana on offer to our transhuman successors.
Ethyl alcohol - the traditional date-rape drug of choice - and, most insidiously of all, cigarettes are the really sinister mass-killers. Their total human death-toll to date is around 100 million and climbing. With that poker-faced Alice-In-Wonderland logic popular amongst the world's sleazier governments, not merely do the authorities preserve the legal status of cigarette sales here in the UK on grounds of upholding personal liberty. The slickly expensive marketing and glamorisation of tobacco products to potential victims is sanctioned on similar grounds too. We ought to be as shocked at tobacco promotion as we'd certainly feel if instead the billboards urged kids to try heroin because it's cool. Yet familiarity breeds moral apathy. Youngsters are typically hooked before they are in any position to make an informed choice of their preferred poison - or even to abstain altogether. Meanwhile a state-supported export drive targets the poor in vulnerable Third World countries. With a cynicism that almost beggars belief, one celebrated British ex-Prime Minister accepted a million-dollar bribe from a leading member of the drug-cartels for her services. Her party's Home Secretary then delivered himself of blood-curdling calls for a crack-down on evil drug-pushers(!). He went on to increase the draconian penalties already available for personal users of cannabis.So long as our governments collude with the organised drug cartels to share out the billions of dollars of tax revenues mulcted from nicotine-addicts - thereby keeping direct taxes visibly down and themselves visibly in office - there seems little hope of a more intelligent approach to psychoactive drugs as a whole.
stone-age" diet rich in organic nuts, seeds, fruit and vegetables, and drastically reducing one's consumption of saturated fat (red meat, fried foods), sugar (sweets etc) and hydrogenated oils (found in margarine and refined vegetable oils), then one's baseline of well-being - or at least relative ill-being - can be sustainably lifted. There is mounting evidence too that an omega-3 fatty acid-rich diet is protective against depression and other psychiatric disorders. Visitors to HedWeb probably don't expect to be assailed by sermons on the benefits of exercise any more than food-faddism. Yet regular and moderately vigorous physical exertion releases endogenous opioids, enhances serotonin function, stimulates nerve growth factors, and leads to a livelier, better-oxygenated brain.Alas, clean living and wholesome thoughts typically aren't enough. We need stronger medicine to flourish. At first glance, however, the standard, State-rationed chemicals aren't a brilliant bunch.The so-called minor tranquillisers, benzodiazepines such as diazepam (Valium), chlordiazepoxide (Librium), alprazolam (Xanax), lorazepam (Ativan), clonazepam (Klonopin) and the shorter-acting sedative-hypnotic temazepam (Restoril), are useful but still dreadfully crude anti-anxiety agents. They act primarily on the GABA (gamma aminobutyric acid) receptor complex. GABA functions as the main inhibitory neurotransmitter in the central nervous system. The progress of molecular biology and neurogenetics in unravelling the fiendish complexity of GABA's receptor sub-types should eventually allow more targeted compounds to be developed. Ideally, these more selective and site-specific drugs will lack the sedative, amnestic and hypnotic properties of today's brands. Activation of GABA(A) receptors containing the alpha 1 subunit is responsible for benzodiazepine-induced sedation and memory deficits. It is hoped that newly-synthesised agonists selective for the alpha 2 GABA(A) receptor subtype may finally deliver a non-sedating antianxiety drug. Merck's investigational L838,417 is one such candidate. Human trials are eagerly awaited.
In the meantime, currently licensed benzodiazepines tend to induce dependence, impair memory and psychomotor peformance, dull consciousness and cloud the intellect. So there's not much chance of radical life-enrichment here, for now at least.Buspirone (Buspar) might seem more promising. It acts to desensitise the inhibitory autoreceptor 5-HT1A subtype of serotonin receptor. It thereby promotes serotonin release. This means that buspirone has mood-brightening properties too. Thus it is useful in anxious depressive states. Buspirone lacks the intellect-clouding effects of other clinical and alcoholic anti-anxiety agents. Yet its weak and equivocal effects on sub-types of dopamine function, while useful for the purposes of commercially touting its lack of "abuse-potential", mean it isn't very exciting or popular. Unlike the benzodiazepines, it's not fast-acting. Researchers hope that newer 5-HT1A agonists in the pipeline such as gepirone (Ariza) will be more effective. Alas any therapeutic gain is likely to be modest.The ill-assorted drugs we today call antidepressants fall into several categories. Their delayed-onset mood-brightening effect is correlated with alterations in the concentration of catecholamines and/or serotonin in the central nervous system, long-term receptor re-regulation, activation of specific transcription factors regulating gene expression, and new nerve-cell growth in the hippocampus.The tricyclics, prototypically imipramine (Tofranil), and their allies are relatives of the neuroleptic drug chlorpromazine. Chlorpromazine is also known as Largactil, the notorious "chemical cosh".
Tricyclics block to varying degrees the reuptake of serotonin and noradrenaline into the nerve cell terminals from where they are released. The consequent changes in pre- and post-synaptic receptor sensitivity lighten the spirits of 60-70% of the depressives who take them. Perhaps unsurprisingly given their parentage, the tricyclics are all dirty drugs, though some are dirtier than others. Their anti-cholinergic effects harm memory, concentration and intellectual performance. Their anti-histamine action induces drowsiness and sedation. Their adverse effect on cardiac function makes them dangerous in overdose. Most "euthymic" volunteers on whom they have been tested don't like their dulling effects of consciousness. Unlike chlorpromazine, the tricyclic antidepressants don't noticeably block the dopamine receptors. But with one notable exception, they do precious little to stimulate dopamine function either. Hence they're not much fun even for the severely depressed people who can benefit from taking them. For three decades they were the mainstay of the treatment of clinically-acknowledged depression. They contributed to the widely-held medical opinion that anything classed as an antidepressant won't help "normal" people; unless of course they were "really" depressed. Basically, tricyclics are cheap, nasty and best avoided.Much better, but still in some ways deeply flawed, are the selective serotonin reuptake inhibitors [SSRIs]. Serotonin, "the civilising neurotransmitter", plays a vital role in mood, memory, appetite, sleep, pain perception and sexual desire.Fluoxetine (Prozac), fluvoxamine (Luvox, Faverin), paroxetine (Paxil, Seroxat), sertraline (Zoloft, Lustral), and citalopram (Cipramil, Celexa) are currently licensed and marketed. More of their tweaked and enhanced relatives are on the way from pharmaceutical companies eager for a lucrative piece of the action. In a triumph of marketing hype and creative use of patent law if not clinical need, citalopram's S-enantiomer was FDA-licensed in 2002 as "Lexapro". The SSRIs all differ in their half-lives, chemical structure and precise specificities. Their functional effects are broadly similar, though Prozac is the most activating, longest-lasting, least selective and most likely to provoke dose-related akathisia; paroxetine has anticholinergic and sedating antihistaminergic effects; fluvoxamine most commonly induces nausea and has the shortest half-life; and citalopram is the most serotonin selective. The mood-brightening, resilience-enhancing and anti-anxiety properties of the SSRIs really can make a (very) modest percentage of the population feel "better than well". As a class, SSRIs (mostly) don't have the physically unpleasant and cognitively debilitating anticholinergic effects of the tricyclics. SSRIs don't demand the dietary restrictions of the MAOIs. Their dependence potential and withdrawal reaction is usually milder than the opioids. A much larger section of the community - folk who daily knock back huge quantities of ethyl alcohol in the socially accepted fashion - could surely gain from the durably enhanced serotonin function that SSRIs can yield. Such a switch would necessitate a big change in marketing strategy.
The (sometimes) beneficent properties of the SSRIs are celebrated in Peter Kramer's contemporary classic Listening to Prozac. Kramer has written a remarkably honest book. It's a discursive memoir by a therapist who is forced to admit that many of his clients seemed rapidly to fare far better on a pill than on his industrial-strength regimen of caring talk-therapy. Kramer's discussion of "cosmetic psychopharmacology" and "designer personalities", however, enraged traditionalists. For chemical Calvinist orthodoxy finds the notion that people should have a right to choose pharmacologically who and what they want to be profoundly offensive.
Two common problems limit the usefulness of SSRIs, at least when taken on their own. The problems stem from the indirect inhibitory effect of Prozac-style drugs on dopamine function, a consequence of deliberate selective targeting of the serotonin system.First, SSRIs can compromise libido and sexual performance. This isn't always a disadvantage in over-excitable young males. It can still be a very distressing phenomenon for older people too embarrassed to talk about it. Technical performance difficulties can sometimes be counteracted by taking the blood vessel dilators apomorphine or phentolamine; the alpha2-adrenergic antagonist yohimbine; a phosphodiesterase type-5 inhibitor like sildenafil (better known as the sexual rocket-fuel Viagra), long-acting tadalafil (Cialis) or newly licensed vardenafil (Levitra); or a dopamine agonist, licit or otherwise, before bedtime action. Investigational drugs that heighten female sexual arousal (e.g. melanocortin agonists like PT-141) are another option. Yet this is scarcely an ideal solution. One of the major signs of depression is loss of interest in sex and reduced libido. So it's questionable whether the FDA and the pharmaceutical industry should continue to promote serotonergic "antidepressants" that are anti-sexual; and collude to suppress antidepressants that are pro-sexual.
Second, though some subjects may feel mildly euphoric, in other users the SSRIs serve more as mood-stabilisers and -flatteners in their lives. By increasing the user's emotional self-sufficiency, too, SSRIs may subtly change the "balance of power" in personal relationships - for good or ill. In some cases, SSRIs may even act as thymoanaesthetisers which diminish the intensity of felt emotion; by contrast, a mood-brightening serotonin reuptake-enhancer like tianeptine may intensify emotion instead. Affective flattening may be welcome to someone in the pit of unmitigated clinical depression. It is scarcely a life-enriching property for "normal" people who lack any convenient diagnostic category which acknowledges their malaise.
THE DOPAMINE CONNECTIONWhat's missing, crucially, is vigorous and prolonged stimulation of meso(cortico-)limbic dopamine function.This is really much more fun than it sounds. The currently available experimental evidence has persuaded many - but not all - investigators that the mesolimbic dopamine system serves as the final common pathway for pleasure in the brain. Enhanced responsiveness of post-synaptic dopamine D2/D3 receptors is crucial to long-term emotional well-being. Insofar as they work, all "serotonergic" and "noradrenergic" mood-brighteners eventually act on the mesolimbic dopamine pathway, albeit in differing degrees and with varying delay. New anti-Parkinsonian agents, notably pramipexole (Mirapex), ropinirole (Requip), and cabergoline (Dostinex) owe their potential role as fast-acting pro-sexual antidepressants to their dopaminergic action. Likewise, the possible mood-brightening effect of low doses of the dopamine receptor antagonist amisulpride (Solian), more commonly considered an antipsychotic agent, is explicable because amisulpride preferentially blocks the presynaptic dopamine D2/D3 autoreceptors; dopaminergic transmission is thereby enhanced.
The full story is inevitably complex. Dopamine agonists and reuptake inhibitors are often inadequate long-term mood-brighteners by themselves. The mesolimbic dopamine system mediates reward-signalling, incentive salience and a sense of urgency and significance, not the essence of pure bliss. Dopamine isn't itself the magic pleasure-chemical, though its functional role in conjunction with glutamate and mu opioid agonists in regulating medium spiny neurons of the rostral shell of the nucleus accumbens is crucial. Researchers into affective disorders readily get over-attached to one particular neurotransmitter system, its receptor sub-types and their signal-transduction cascades. Traditionally, serotonin and noradrenaline have attracted the fiercest rival partisans. "Dopaminergic" (and opioid) agents, by contrast, are suspect. They are politically incorrect since they are potentially "abusable". Moreover it can be argued that the research and development of safe and sustainable E-like empathogens and socialbilizers is as morally urgent as the license of safe and sustainable euphoriants. At any rate, enhanced mesolimbic dopamine release, exclusively or otherwise, enriches the intensity of experience; increases pleasure and libido, and potentially boosts cognitive performance. Even better, whereas some dopaminergics are potentially toxic, some dopamine-enhancing agents may have neuroprotective properties as well.So what are the other contemporary options for chemical life-enhancement?
METHYLPHENIDATE; MINAPRINE; NOMIFENSINE A SSRI can be combined ("augmented" sounds more soothing to the official medical ear) with a dopaminergic such as methylphenidate. As Ritalin, methylphenidate is prolifically dispensed to American schoolchildren for different purposes altogether. In spite of its structural relationship to amphetamine, methylphenidate resembles in many ways a benign version of cocaine, yet with a much longer half-life. It blocks the reuptake, but doesn't significantly release, the catecholamines noradrenaline and dopamine. If it is taken in sustained-release form or combined with an SSRI, all of which have anti-obsessive-compulsive properties too, then the likelihood of dose-escalation is minimised.Chewing coca leaves with a dash of powdered lime is a nutritious and energising way to sustain healthy mood. Unfortunately, it is not very good for one's teeth.A more cautious but still interesting option might be minaprine (Cantor). Minaprine blocks the reuptake of both dopamine and serotonin. It is also in some degree cholinomimetic. Thus it may exhibit both mood-brightening and nootropic properties. Much more research is needed.Merital (nomifensine) showed great promise as a pleasantly stimulating dopaminergic that also potently inhibits the reuptake of noradrenaline and - to a much lesser extent - serotonin. It was marketed by its manufacturers Hoechst with the slogan "vive la difference!" Merital was withdrawn from licensed use after the discovery of its rare side-effect of precipitating a serious blood-disorder. For retarded melancholics, however, it was typically a very effective and well-tolerated mood-brightener with minimal side-effects. The risk/reward ratio of its carefully-monitored use may have been misjudged.
BUPROPION; AMINEPTINEBupropion (Wellbutrin) is possibly less effective than nomifensine. Yet it's useful because it lacks the adverse effects on sexual function characteristic of the SSRIs. In some subjects - particularly women - libido, arousal, and the intensity and duration of orgasm may actually increase. Bupropion mildly blocks the reuptake, but diminishes the release, of dopamine. This may account for reports of its diminished propensity to induce mania in the genetically susceptible. Its active metabolites block the reuptake of noradrenaline. Marketed as Zyban, bupropion is good for giving up smoking. Scandalously, bupropion isn't licensed and marketed as an antidepressant in Europe - though doctors may prescribe Zyban to non-smoking depressives "off-label".Amineptine (Survector) is a clean-ish, (relatively) selective dopamine reuptake blocker. Higher doses promote dopamine release too. Amineptine is pro-sexual and liable occasionally to cause spontaneous orgasms. It is a mild but pleasant psychostimulant and a fast-acting mood-brightener. Unlike other tricyclics, it doesn't impair libido or cognitive function. Unlike typical stimulants and other activating agents, it may actually improve sleep architecture. Scandalously, amineptine isn't licensed and marketed in Britain and America. For it is feared it might have "abuse-potential". FDA pressure recently led to its withdrawal in Europe too. This drove it onto the pharmaceutical grey market, discomfiting doctors and patients alike.
REBOXETINE; ADRAFINIL; MODAFINIL Reboxetine (Edronax) is a well-tolerated, highly selective "noradrenergic" agent. Crudely, whereas serotonin plays a vital role in mood, noradrenaline is essential to maintaining drive, vigilance and the capacity for reward. There's a fair bit of evidence that chronically depressive people have dysfunctional and atypical noradrenergic systems - particularly their alpha2- and beta-adrenoceptors. Reboxetine itself typically doesn't have the disruptive effects on cognitive function or psychomotor performance common to older clinical mood-brighteners - though alas antimuscarinic effects are still not completely absent. The new NorAdrenaline Reuptake Inhibitors (NARIs) - and dopaminergics like amineptine (Survector) - may be especially useful in drive-deficient "anergic" states where the capacity for sustained motivation is lacking; and for melancholic depressives with a poor ability to cope with stress. Reboxetine may be safely combined with an SSRI, though there is evidence that NARIs themselves indirectly enhance central serotonin function by a mechanism that doesn't depend on reuptake inhibition. More surprisingly perhaps, preliminary studies suggest reboxetine can actually reverse tranylcypromine-induced hypertensive crises. The "cheese effect" is triggered by ingesting tyramine-rich foods. Thus NARIs plus MAOIs may prove a potent form of combination-therapy if first options fail.Depressive hypersomniacs who fare poorly on SSRIs, or can't get hold of amineptine or EC-licensed reboxetine, might consider trying a so-called eugeroic ("good arousal") agent instead. Alpha1-adrenergic agonists like adrafinil (Olmifon) and modafinil (Provigil) are centrally-acting psychostimulants that can brighten mood and sharpen mental focus. They stimulate the noradrenergic post-synaptic receptors, increase glutamatergic transmission, and activate the wakefulness-promoting orexinergic neurons, thereby boosting alertness, memory and energy. At sensible dosages, they are remarkably free of side-effects. However, the approval process in the USA is so slow, costly and bureaucratic, and the marketing hurdles typically so formidable, that foreign companies are often deterred from seeking FDA acceptance. [modafinil was licensed by the FDA as Provigil for the treatment of narcolepsy in Dec 1998; and in September 2003, an advisory panel to the FDA endorsed its use for treating shift work sleep disorder and sleep apnea] So elderly people continue to suffer the prescription of mildly dementing anticholinergics like the dumb-drug tricylcic imipramine. Adrafinil, by contrast, is at least as successful as hepatotoxic Anglo-Saxon products at treating the cognitive and memory impairments of incipient senility. Fortunately, a "French" drug like adrafinil can now be ordered over the Net; but it ought to be available at the local corner-store. It has the commercial disadvantage of being cheap.
MIRTAZAPINE; NEFAZODONE; VENLAFAXINE; DULOXETINE; ROLIPRAM NARIs are normally activating. Anxious and depressive insomniacs, on the other hand, may benefit more from "dual-action" mirtazapine or nefazodone.Mirtazapine (Remeron) is a structural analogue of the off-patent mianserin (Bolvidon). It is a comparatively new drug - a so-called NaSSA. By blocking the inhibitory presynaptic alpha2 adrenergic autoreceptors and stimulating only the 5-HT1A receptors, mirtazapine enhances noradrenaline and serotonin release while also blocking two specific (5-HT2 and 5-HT3) serotonin receptors implicated in dark moods and anxiety. By contrast, stimulation of the 5-HT2A receptors accounts for the initial anxiety, insomnia and sexual dysfunction sometimes reported with the SSRIs; stimulation of the 5-HT3 receptors causes nausea. Unfortunately, mirtazapine is a potent blocker of the histamine H1 receptors too. So it tends to have a somewhat sedative effect. This profile may be good for agitated depressives and insomniacs. Again, it is scarcely a recipe for life-affirmation.Nefazodone (Serzone) is another newish, "dual action", mainly serotonergic agent. It inhibits the reuptake of serotonin while displaying post-synaptic 5-HT2A-receptor antagonism. This may be useful for anxious depressives; but again, it may cause feelings of weakness, drowsiness and lack of energy. Nefazodone is less likely to cause priapism than its older cousin trazodone (Desyrel). It is less likely to cause sexual dysfunction than the SSRIs. But nefazodone can also be toxic to the liver, albeit rarely. It may soon be withdrawn.Venlafaxine (Effexor) is a phenethylamine. Thus it's a benign if distant chemical cousin of MDMA. Its manufacturers launched it as "Prozac with a punch". Venlafaxine inhibits the neuronal reuptake of serotonin, noradrenaline and dopamine in descending order of potency. If dopaminergically augmented, it offers another opening for creative psychopharmacology. Such augmenation-therapy remains (almost) clinically unexplored. Taken on its own at low dosage, venlafaxine acts primarily as a serotonin re-uptake inhibitor. At the high-level dosages most suitable for melancholic and hypersomnic temperaments, its noradrenergic (and weakly dopaminergic) action becomes more pronounced. Venlafaxine lacks anticholinergic activity; but some users are troubled by its antihistamine side-effects. Like the SSRIs, it is useful for a broad spectrum of disorders beyond clinical depression.It is possible that duloxetine (Cymbalta), due to be FDA-licensed in 2004, and milnacipran (Ixel), available in Europe, may be more effective than venlafaxine for a segment of the population that can benefit from dual serotonin-noradrenaline reuptake inhibition. Pain-ridden and melancholic depressives in particular may respond well to this class of drug. Once again, dopaminergic augmentation may be beneficial for the naturally lethargic. Unlike venlafaxine, duloxetine exerts its more balanced serotonin and noradrenaline reuptake inhibition throughout the dosage range. Duloxetine also weakly inhibits the reuptake of dopamine, and shows minimal affinity for the histamine and cholinergic muscarinic receptors. But it takes time to separate genuine therapeutic advance from drug company hype, typically not until the patent expires.Phosphodiesterase-inhibitors, both selective (e.g. the PDE type 4 inhibitor rolipram) and unselective, are another under-used option. The next few decades will take us much closer to the downstream intra-cellular action. For it is here that our minds will ultimately be healed, genetically or otherwise.
HYPERICUM Hypericum is important for a different reason altogether. Many constitutionally unhappy people refuse to have anything to do with orthodox western medicine. They won't take "unnatural" pharmaceutical products at all. In consequence, they spend much of their lives trapped in a squalid psychochemical ghetto of chronic low spirits. The only sort of remedy that they'll conceivably contemplate taking must carry a "natural" label and soothingly "herbal" description.Unfortunately, most folk remedies are only marginally effective. Our drug-metabolising enzymes are the product of an evolutionary arms race to counteract plant toxins. For plants tend to manufacture psychotropics because they poison or debilitate creatures tempted to eat them - not to heal our psychic woes. The Wisdom Of Nature is a quaint piece of make-believe. Perversely, several of the natural remedies that sometimes actually work - notably Cannabis sativa, Erythroxylon coca and Papaver somniferum - are now illegal. Other "natural" options are extremely limited. But two worth exploring are SAMe and St John's wort.Hypericum, the active ingredient in St John's wort, appears to be an effective mood-brightener and anxiolytic - by today's standards at least. Its side-effect profile and efficacy in mild-to-moderate depression compares favourably with its synthetic counterparts. Hypericum's blend of serotonin-reuptake inhibiting and (mild) MAO-inhibiting properties (not a combination otherwise to be explored with potent synthetics: the risk of the potentially fatal serotonin syndrome is too great) contributes to - without wholly explaining - its generally benign effects. Once again, much more research is needed, preferably not bankrolled by the makers of lucrative competing products. Faith in the integrity of biological psychiatry would be greater if the strongest predictive factor in the outcome of any published clinical trial wasn't the identity of the funding body.INOSITOL One further remedy, albeit at "unnatural" doses, is worth noting. Inositol levels tend to be low in depressives and high in euphoric people. Taking myo-inositol as a food supplement in doses of 12g and more per day represents perhaps the first successful use of the precursor strategy for a second messenger rather than a neurotransmitter in the search for long-term mood-brightening agents. Inositol and its derivatives serve as messenger molecules within the nervous system. The molecule itself is a naturally occurring isomer of glucose. It is a key intermediate of the phosphatidyl-inositol cycle. This is a second-messenger system used by several noradrenergic, serotonergic and cholinergic receptors. Adult westerners typically consume about one gram of inositol per day in their food. The richest dietary sources are fruits, nuts, beans and grains. The mood-darkening ("stabilising") effect of lithium in manically euphoric people may be explicable in terms of its inositol-depleting effect. Potentially, if taken in high doses, inositol seems to be a good way of lightening the spirits and diminishing anxiety in "euthymic" and depressed people alike. Dosages of even 50g and more reportedly produce no toxic side-effects. This regimen shouldn't be attempted unsupervised by people with a history of bipolar disorder. As usual, much more research is in order. One "problem" is that naturally-occurring compounds - such as inositol and SAMe - can't be patented. So the scope for high profit-margins is diminished. Progress is unlikely to be brisk.
THE MAO INHIBITORS
A further option involves using both some of the oldest and the newest drugs on the block, the monoamine oxidase inhibitors (MAOIs). The older irreversible MAOIs certainly shouldn't be combined with SSRIs, and inadvisably with stimulants and many other drugs. Yet both old and new, they do have some very interesting properties. MAOIs may be particularly useful for rejection-sensitive, so-called atypical depressives who have "reversed vegetative symptoms" i.e. overeating and oversleeping.Monoamine oxidase has two main forms, type A and type B. They are coded by separate genes. MAO may be inhibited with agents that act reversibly or irreversibly; and selectively or unselectively; these categories are not absolute. MAO type-A preferentially deaminates serotonin and noradrenaline, and also non-selectively dopamine; type B primarily metabolises dopamine, phenylethylamine (the "chocolate amphetamine") and various trace amines.The substantial mood-elevating properties of the MAOIs were discovered quite by chance in a US veterans hospital early in the 1950s. Many patients given the anti-tuberculotic drug iproniazid were not merely cured of their tuberculosis. They became exceptionally happy as well. The animated enthusiasm for life of a previously crotchety bunch of old soldiers disconcerted their doctors. For it transpired that their new-found euphoria wasn't just an understandable reaction to being cured of physical disease. MAOIs typically have mood-brightening properties as well. At the time, there was no accepted and clinically effective treatment for depression. Fortunately, via the usual circuitous routes, the appropriate lessons were eventually drawn. Many millions of people were successfully treated with MAOIs in consequence.Sadly, the role of MAO in deaminating tyramine (from the Greek word tyros, meaning cheese) wasn't at first understood. Certain MAOI-treated patients suffered hypertensive crises after eating varying amounts of tyramine-rich aged cheese; and several died. It is now recognised that the use of any MAOI which is both irreversible and unselective must be accompanied by dietary restrictions. But the adverse publicity of the initial inexplicable fatalities, combined with the introduction of a succession of dirty but sometimes tolerably effective tricyclic compounds, sent the use and reputation of MAOIs into a precipitous decline from which they still haven't fully recovered.
The older non-selective and (more-or-less) irreversible inhibitors tranylcypromine (Parnate), phenelzine (Nardil) and isocarboxazid (Marplan) are nonetheless valuable drugs. Outside the USA, they tend to have been eclipsed by the selective and reversible moclobemide. Similar therapeutic agents are in the pipeline. Of greater interest still are central-nervous-system-selective compounds, notably the neuroprotective antidepressant and anti-Alzheimer's drug TV3326. MAOIs that lack the peripheral effects of currently explored drugs herald an exciting new window of therapeutic opportunity.SELEGILINE (l-deprenyl)A recent New York study showed that smokers had on average 40% less of the enzyme, monoamine oxidase type-B, in their brains than non-smokers. Levels returned to normal on their giving up smoking. Not merely is the extra dopamine in the synapses rewarding. The level of MAO-b inhibition smokers enjoy apparently contributes to their reduced incidence of Parkinson's and Alzheimer's disease. Unfortunately they are liable to die horribly and prematurely of other diseases first.One option which the dopamine-craving nicotine addict might wish to explore is switching to the (relatively) selective MAO-b inhibitor selegiline, better known as l-deprenyl. Normally the brain's irreplaceable complement of 30-40 thousand odd dopaminergic cells tends to die off at around 13% per decade in adult life. Their death diminishes the quality and intensity of experience. It also saps what in more ontologically innocent times might have been called one's life-force. Eighty percent loss of dopamine neurons results in Parkinson's disease, often prefigured by depression.
Deprenyl has an anti-oxidant , immune-system-boosting and dopamine-cell-sparing effect. Its use boosts levels of tyrosine hydroxylase, growth hormone, superoxide dismutase and the production of key interleukins. Deprenyl offers protection against DNA damage and oxidative stress by hydroxyl and peroxyl radical trapping; and against excitotoxic damage from glutamate.Whatever the full explanation, deprenyl-driven MAOI-users, unlike cigarette smokers, are likely to be around to enjoy its distinctive benefits for a long time to come, possibly longer than their drug-naïve contemporaries. For in low doses, deprenyl enhances life-expectancy, of rats at least, by 20% and more. It enhances drive, libido and motivation; sharpens cognitive performance both subjectively and on a range of objective tests; serves as a useful adjunct in the palliative treatment of Alzheimer's and Parkinson's disease; and makes you feel good too. It is used successfully to treat canine cognitive dysfunction syndrome (CDS) in dogs. At dosages of around 10 mg or below daily, deprenyl retains its selectivity for the type-B MAO iso-enzyme. At MAO-B-selective dosages, deprenyl doesn't provoke the "cheese-effect"; tyramine is also broken down by MAO type-A. Deprenyl isn't addictive, which probably reflects its different delivery-mechanism and delayed reward compared to inhaled tobacco smoke. Whether the Government would welcome the billions of pounds of lost revenue and a swollen population of energetic non-taxpayers that a switch in people's MAOI habits might entail is unclear.MOCLOBEMIDEHumans now have the capacity to choose their own individual level of activity or inhibition of the two primary monoamine oxidases. This does not quite enable the fine-tuning of personality variables with the functional equivalent of a graphic equaliser. It still represents a promising start. In MAO-inhibition, as in life, more is not always better. Excessive dosages of l-deprenyl, for instance, may actually shorten, not increase, life expectancy - at least in Parkinsonians if it's combined with l-dopa. And levels of above 80% inhibition of MAO-A may lead to a sharp and possibly unwanted fall in dopamine synthesis. Repairing Nature's niggardliness will be a priority for the decades ahead.Moclobemide (Manerix, Aurorix), the "gentle MAOI", is both a selective and reversible inhibitor of MAO-A.
It marks the first RIMA to win clinical acceptance. It lacks anti-cholinergic side-effects. No dietary restrictions are needed. It is valuable as more than a mood-enhancer and resilience-booster. For moclobemide is often useful in overcoming social phobia, panic disorder, obsessive-compulsive symptoms, irritability and aggression owing to the way it enhances serotonin function. (The casual use of gobbledygook such as "enhanced x function" will rightly alert the reader that many complications are being skirted or omitted. Those hungry for the greater technical detail of a non-popular account can rest assured the literature will leave them feeling abundantly well-nourished).TRANYLCYPROMINEGentleness doesn't suit everyone. Moclobemide isn't much good at lifting deep melancholy. Tranylcypromine (Parnate), on the other hand, is one of the older and non-selective MAOIs - and is often none the worse for it. Structurally related to amphetamine, it's generally the most stimulating, dopaminergic and relatively fast-acting of the MAOIs. Some doctors are uncomfortable with its properties. This isn't just because of the dietary restrictions it demands. In adequate doses, it tends to induce a mild euphoria even in "normal" subjects. In fact, its nicest effects, as for all of the compounds cited here, will vary in nature and extent from person to person. To some extent, optimal dosage and long-term drug-regimen of choice can be discovered only by cautious empirical investigation.
Tranylcypromine is of course vastly preferable to the amphetamines and cocaine. Yet frequently and perversely, the more hazardous the drug, then the easier it is to get hold of in our society. The carcinogenic cocktail that carries off more people than all other toxins combined can be purchased quite legally and effortlessly at any tobacconist or newsagent. Obtaining the less lethal - but scarcely desirable - street opioids and psychostimulants requires a little more exertion. Yet they can still be readily purchased in pubs and clubs in all the big towns and cities. Many of the more beneficent drugs discussed here, on the other hand, are unlicensed, "investigational", or available on a prescription-only basis. They're not illegal to possess. But they are hard to obtain short of visiting countries where they're available over-the-counter or paying high mail-order prices for an uncertain service.If the central principle at stake here were the preservation of a drug-free society, then some sort of totalitarian (or, more euphemistically, paternalistic) argument could be cobbled together for violating personal freedom so oppressively.
Yet that's rarely the issue. For in most cases, the issue effectively amounts, not to drugs or no drugs, but to allowing people the choice to opt for better ones. Perhaps 80% of the population in Western countries currently drink alcohol or smoke cigarettes. Often they do both. Whether viewed in terms of mortality, morbidity or overall quality of life, we'd be better off if we switched to enhancing receptor sub-type selective dopaminergic, opioidergic, serotonergic and cholinergic function by the relatively safe and crude agents touched on here; and perhaps to the more exciting products under development. As a basic minimum, people shouldn't be legally robbed of the right to do so.This freedom of choice isn't conventional wisdom. It will be suggested that the level of medical expertise required to make informed choices exceeds that of the average layperson; and a quasi-priestly caste wielding the power of the prescription-pad would doubtless wish to keep it that way. But the intrinsic difficulty and complexity of psychopharmacology or nutritional medicine, say, doesn't demand greater mental effort than, for instance, all those thousands of grimly unnatural hours spent by school students learning mathematics. Moreover it's far more interesting to study something palpably relevant to one's emotional well-being than something that demonstrably isn't. The notion of an education system geared to schooling people in, and for, happiness would nonetheless strike adherents of the reigning educational orthodoxy as abhorrent were it not so largely incomprehensible.
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Hot-headed. You have strong will power and a good imagination.  |
