Showing posts with label Too. Show all posts
Showing posts with label Too. Show all posts

Saturday, 1 April 2017

Tests For New Drugs Are Too Often Rigged To Suit The Market


Today's post from pharmaciststeve.com (see link below) looks at the current drugs debate in North America from a different angle. It asks: just how trustworthy are the testing procedures on new drugs and just how safe are FDA approved (based on those testing procedures) drugs for patients? The answer is not reassuring. Now neuropathy patients know more than most how much research needs to be done on new drugs to treat nerve damage symptoms. They've also been guinea pigs in the search for new and relevant treatments and it's one of those diseases for whom, drugs work for some but not for others. We need to be able to trust the testing procedures and the drug research companies that carry them out and we also need to be able to trust the FDA's final conclusions. This article suggests that neither are rock-solid, so where does that leave us, who are desperate for new drug therapies? Well, it means that we have to be even more pro-active than before and do as much research as is humanly possible ourselves. Thank god for the internet - we can find most of what we need to know there and with advice from our doctors, we can draw our own conclusions. Unfortunately we can't separate politics from health at the moment.

Virtually every pharmaceutical company has been rigging tests for years to make the drugs we take look safer than they really are
Posted on December 27, 2015 by Pharmaciststeve
 

U.S. needs better regulation of drug development

Over the last weeks, we have learned that major companies that make products we trust, like Volkswagen’s diesel engines and Takata’s air bags, have devised ways to rig test results so they look cleaner and safer than they really are. Yet far more widespread manipulation of test results is being done by pharmaceutical companies to get drugs approved by the U.S. Food and Drug Administration that turn out not to be as safe as promised.

In the pharmaceutical industry, virtually every company has been rigging tests for years to make the drugs we take look safer than they really are. Some of the techniques for rigging clinical trials are described in a recent assessment published by BMJ (formerly known as the British Medical Journal). They include drawing random samples for clinical trials from a population that exclude older people, women, and people with multiple health problems who may be more likely to have adverse reactions. The resulting “safety” of the drugs misleads physicians and their patients.

Other techniques include using high doses in shorter trials in order to produce positive results before adverse reactions become evident. Only later do patients learn about them the hard way. FDA regulations also allow companies to run multiple trials (at great expense, used to justify high prices) and handpick the most positive ones while obscuring evidence of toxic reactions.

Worse, unlike regulators for cars, planes, electronic devices, and appliances, who work to detect and stop rigged testing, the FDA division that reviews new drugs has long known about the ways that companies bias trials. This puts patients at serious risk. Based on reviews of hospital clinical charts, independent experts estimate approximately 128,000 patients die each year from adverse responses to properly prescribed drugs. And 2.7 million are hospitalized due to drug reactions. Those estimates do not even include problems related to over-prescribing, errors, and self-prescribing.

Exactly which drugs approved by the FDA’s fast-track process have proved most dangerous to consumers? Given the central importance of drugs in modern medicine, you would think there would be a comprehensive tracking system at the FDA to provide this information by drug. But there isn’t.

In fact, perhaps the most famous such failure is Vioxx, which Merck finally withdrew – following years of obfuscation – after it was estimated to have killed about as many people as the U.S. military lost in the Vietnam War. Note, it was the manufacturer that pulled the drug, not the FDA.

But there are many examples. Worst Pills, Best Pills (www.worstpills.org) is a reputable, subscription-based project of the advocacy group Public Citizen that tracks safety information on nearly 2,000 drugs.

Why does the FDA permit biased company trials for safety and efficacy? Perhaps it has something to do with Congress’ underfunding of the FDA since the antiregulation period under President Ronald Reagan and then having companies fund the division that evaluates their drugs.

These practices subject patients to a double conflict of interest. First, companies test their own drugs for the public regulator, rather than having them tested independently. Then, companies pay the FDA a huge fee – $2.3 million in 2015 – to review each drug. Highly trained and skilled staff work hard to do thorough reviews. But the reviews are on the companies’ terms – their criteria, their trials, their data, their deadlines, their funded patient groups clamoring for approval, and their money.

Reviewers do turn back or turn down drug candidates. Yet 90 percent of the drugs the FDA approves are judged by independent reviewers to provide few or no clinical advantages for patients over existing drugs.

And because these new drugs are inadequately tested, the results are predictable. One in every five new drugs ends up causing enough serious harm to lead the FDA to add the most serious black box warning, or remove the drug from the market – after the harm has been done.

This risk increases to one in three when reviews are accelerated under a special (and legal) process, requiring even higher fees from drugmakers.

Do patients really want faster access to drugs that provide few or no new benefits and have substantial risks of serious harm? Do they want an FDA that largely serves the industry that funds it by approving many new minor variations to increase sales, without good testing for safety?

A few clinically superior drugs are developed each year. But accelerated reviews and low, loose FDA criteria encourage companies to develop more minor variations that will get through the approval process, rather than focus on major advances. To encourage more superior drugs, the FDA needs to require tests for real clinical advances compared to risks of harm.

We need a congressional investigation, with subpoena power, to investigate how the FDA allows manipulations of true randomized trials that understate risks of harm. We need to end a third conflict of interest that endangers patients: The same FDA group that approves drugs as “safe” is responsible for investigating evidence of harm. Only 10 percent of FDA staff are assigned to drug safety. We need an independent, well-funded watchdog for patient safety.

Most important, as a public agency charged with protecting people from unsafe drugs, the FDA needs to be funded entirely by taxpayers. Drugs are now the fourth leading cause of death in America, tied with stroke. The FDA needs to stop contributing to this problem and help reduce the number of patients exposed to risks of serious harm.

Donald Light is a widely published expert on drug policy and a professor of comparative health policy at Rowan University
 

 http://www.pharmaciststeve.com/?p=13009

Wednesday, 2 November 2016

HOME TEST FOR TOO MUCH CAFFEINE



The shocking news of an Ohio teen who died of a caffeine overdose in May highlighted the potential dangers of the normally well-tolerated and mass-consumed substance. To help prevent serious health problems that can arise from consuming too much caffeine, scientists are reporting progress toward a rapid, at-home test to detect even low levels of the stimulant in most beverages and even breast milk. Their report appears in ACS' Journal of Agricultural and Food Chemistry

Mani Subramanian and colleagues note that caffeine's popularity as a "pick-me-up" has led to it being added to more than 570 beverages and 150 food products, including gums and jelly beans. It also comes in a pure powder form that consumers can use themselves to spike drinks and food. In small amounts, most people can handle caffeine without a problem. But excessive doses can lead to serious health problems, including insomnia, hallucinations, vitamin deficiency, several types of cancer and in rare cases, death. Subramanian's team wanted to develop a quick and easy way for consumers to determine whether the caffeine levels in their foods and drinks fall within a safe range.

They tested an enzyme called caffeine dehydrogenase and found that it could detect caffeine in a variety of drinks -- with the exception of teas -- within one minute. Also, it was sensitive enough to pick up on caffeine's presence at concentrations as low as 1 to 5 parts per million, the maximum limit the Food and Drug Administration advises for nursing mothers. They say that their method could be integrated into a dip-stick type of test, like over-the-counter pregnancy tests, that could be used at home.



Tuesday, 4 October 2016

Peruvian Green Velvet Tarantula May Kill Pain Too


Today's post from sciencedaily.com (see link below) revisits an area of research that seems to have been relatively quiet recently and that is the potential for animal venoms to create pain killers. This time, the article talks about Tarantula spider toxins and in particular the exotic sounding, Peruvian green velvet tarantula. Apparently this creature's venom can selectively inhibit pain receptors and as such, when refined, has great potential as a future pain killer, especially for nerve pain. When you think that the spider's purpose is to paralyse its prey so that there's no struggle and easy eating, then the stretch of our imagination may not be so great. The article becomes more complex as it goes on but you will get the gist and we can once again be excited by the potential of snake, spider and fish venoms to help relieve our neuropathy symptoms. The sooner it can be put into a bottle, the sooner we won't be confronted by images of its donor!

Tarantula toxins converted to painkillers
Date:February 29, 2016Source:Biophysical Society  

 
It turns out that peptide toxins isolated from the venom of some animals -- such as the Peruvian green velvet tarantula -- can be beneficial when used to target neural receptors to reduce the sensation of pain.

When venom from animals such as spiders, snakes or cone snails is injected via a bite or harpoon, the cocktail of toxins delivered to its victim tends to cause serious reactions that, if untreated, can be lethal. But even venom has a therapeutic upside: Individual peptide toxins are being tapped to target receptors in the brain to potentially serve as painkillers.

Millions of people live with chronic and neuropathic pain, in large part because current treatments often provide limited pain relief, have a heavy profile of soporific side effects and can be extremely addictive. So researchers around the globe are chasing down potential new therapeutic agents and working to gain a better understanding of how molecules with painkiller activity function. This will lead to alternative painkillers--and possibly improve the quality of life for people who suffer from chronic pain.

At the Biophysical Society's 60th Annual Meeting, being held in Los Angeles, Calif., Feb. 27-March 2, 2016, a group of researchers from the University of Queensland in Brisbane, Australia, will describe their efforts with ProTx-II, a peptide toxin found within the venom of the Peruvian green velvet tarantula, Thrixopelma pruriens. Its high potency and selectivity to inhibit the pain sensation receptor make it an ideal candidate as a future painkiller.

"Our group is specifically interested in understanding the mode of action of this toxin to gain information that can guide us in the design and optimization of novel pain therapeutics," said Sónia Troeira Henriques, senior research officer at the University of Queensland's Institute for Molecular Bioscience.

How does ProTx-II work? "It binds to the pain receptor located within the membrane of neuronal cells, but the precise peptide-receptor binding site and the importance of the cell membrane in the inhibitory activity of ProTx-II is unknown," explained Henriques.

So the group zeroed in on its structure-activity relationship by "exploring the structure, the membrane-binding properties, and the inhibitory activity of ProTx-II and a series of analogues," she added.

Nuclear magnetic resonance (NMR) spectroscopy enables 3-D characterization of the structure of this peptide, which allows the group to explore whether it's important for its ability to inhibit the pain receptor.

They also use surface plasmon resonance and fluorescence methodologies, as well as molecular simulations, to further characterize the interactions between the peptide and the neuronal cell membrane and to identify the molecular properties of the peptide involved in the interaction and inhibition with the pain receptor.

"Our results show that the cell membrane plays an important role in the ability of ProTx-II to inhibit the pain receptor. In particular, the neuronal cell membranes attract the peptide to the neurons, increase its concentration close to the pain receptors, and lock the peptide in the right orientation to maximize its interaction with the target," said Henriques.

The group's work is the first to describe the importance of the membrane-binding properties of ProTx-II for its potency as an inhibitor of Nav 1.7, an important pain receptor. "Until now, studies characterizing the inhibitory activity of venom toxins have ignored the potential role of the cell membrane in their potency and activity," she noted.

Beyond Nav 1.7, "other voltage-gated ion channels are located at the cell membrane and involved in a range of physiological processes such as muscle and nerve relaxation, regulation of blood pressure, and sensory transduction," Henriques pointed out. "Their 'faulty' activity is, however, associated with several disorders, so other ion channels are actively being pursued as drug targets for the treatment of neuromuscular disease, neurological disorders, and inflammatory and neuropathic pain."

Based on the group's findings, they're now designing new toxins with greater affinity for the cell membrane and fewer side effects.

"Our work creates an opportunity to explore the importance of the cell membrane in the activity of peptide toxins that target other voltage-gated ion channels involved in important disorders," said Henriques.

Story Source:

The above post is reprinted from materials provided by Biophysical Society. Note: Materials may be edited for content and length.


 https://www.sciencedaily.com/releases/2016/02/160229082005.htm

Saturday, 16 July 2016

Non smokers Can Benefit From Cannabis based Neuropathy Relief Too


Non-smokers and ex-smokers have often been put off trying cannabis for the relief of neuropathic pain (the laws of the land are often a discouraging factor too!) because of the potential damage to their lungs. However, using a vaporizer may well be the answer as it apparently delivers the same amount of THC, with the same biological effects, without the inhaling of tobacco, or other toxins normally associated with smoking. As always, assuming that you are able to access regular marijuana, the decision has to be made as to whether the benefits outweigh the risks. This article comes from imarijuana.com (see link below).
















Same Level Of THC and Fewer Toxins with Marijuana Vaporizer
Posted on 22 November, 2011 by admin

According to researchers from the University of California San Francisco, a smokeless cannabis-vaporizing device delivers the same level of active therapeutic chemical and produces the same biological effect as smoking cannabis.

Results of a UCSF study that focuses on delivery of the active ingredient delta-9-tertrahydrocannibinol, or THC, are reported in the online issue of the journal “Clinical Pharmacology and Therapeutics.”

“We showed in a recent paper in the journal ‘Neurology’ that smoked cannabis can alleviate the chronic pain caused by HIV-related neuropathy, but a concern was expressed that smoking cannabis was not safe. This study demonstrates an alternative method that gives patients the same effects and allows controlled dosing but without inhalation of the toxic products in smoke,” said study lead author Donald I. Abrams, MD, UCSF professor of clinical medicine.

The team of researchers looked at the effectiveness of a device that heats cannabis to a temperature between 180 and 200 degrees C, just short of combustion, which occurs at 230 degrees C. Eighteen individuals were enrolled as inpatients for six days under supervision in the General Clinical Research Center at San Francisco General Hospital Medical Center. The participants received three different strengths of cannabis on different days by two delivery methods–smoking or vaporization–three times a day, under the study protocol.

THC plasma concentrations were measured along with the exhaled levels of carbon monoxide, or CO, which served as a marker for the many other combustion-generated toxins inhaled when smoking.

“Using CO as an indicator, there was virtually no exposure to harmful combustion products using the vaporizing device. Since it replicates smoking’s efficiency at producing the desired THC effect using smaller amounts of the active ingredient as opposed to pill forms, this device has great potential for improving the therapeutic utility of THC,” said study co-author Neal L. Benowitz, MD, UCSF professor of medicine, psychiatry and biopharmaceutical sciences.

Benowitz added that pills tend to provide patients with more THC than they need for optimal therapeutic effect and increase side effects.

“By a significant majority, patients preferred vaporization to smoking, choosing the route of delivery with the fewest side effects and greatest efficiency,” said Benowitz.

Co-authors include Cheryl A. Jay, MD, UCSF neurology; and Starley B. Shade, MPH; Hector Vizoso, RN; and Mary Ellen Kelly, MPH, UCSF Positive Health Program at San Francisco General Hospital Medical Center.

The study was funded by the University of California’s Center for Medicinal Cannabis Research.
Reference:University of California – San Francisco

http://www.imarijuana.com/tag/smoked-cannabis

Saturday, 18 June 2016

Botox Can Remove Nerve Pain Wrinkles Too


Today's post from medscape.com (see link below) revisits a topic that crops up every now and then without seeming to take hold in the neurological consciousness and that is using botox to reduce neuropathic symptoms. The article looks at a recent trial and research project that studied the effects of botulinum toxin injections for nerve pain patients. It was a serious study and led to conclusions that botox is in fact beneficial for neuropathy patients. It was also heavily supported by the major drug companies who of course can see massive commercial potential if botox is conclusively proved to be another weapon in the arsenal against nerve pain. It's a fascinating article and well worth a read, if you can get away from Botox's image of being a cosmetic improvement drug.


Botox Alleviates Neuropathic Pain
Pauline Anderson March 23, 2016
The study was published online February 29 in Lancet Neurology.

Repeated subcutaneous injections of botulinum toxin A (Botox, Allergan) provides analgesic relief to patients with neuropathic pain, a new randomized controlled trial has shown.

The study showed that two series of injections were safe and effective for treating peripheral neuropathic pain, especially in a subgroup of patients with allodynia.

This research is important because neuropathic pain is a debilitating condition and represents a "highly unmet need," in that there are very few effective treatments that don't have significant side effects, said lead author Nadine Attal, MD, PhD, associate professor of neurology, University Versailles Saint-Quentin, Paris, France, and a member of the Institut National de la Santé et de la Recherche Médicale Research Unit on pain.

"We need to increase the therapeutic options for these patients."

Botulinum toxin type A, which blocks nerve signals and causes muscle paralysis, is widely used to treat muscle hyperactivity, but evidence that it may also have analgesic activity is now emerging.

The new analysis included 66 patients at two clinics in France and one in Brazil who met the criteria for probable or definite neuropathic pain and who had daily pain for at least 6 months attributable to a peripheral nerve lesion.

The most common cause of pain in these patients was post-traumatic or postsurgical neuropathic pain. Pain predominantly affected the hand, forearm, foot, or ankle.

Researchers randomly assigned these patients to receive subcutaneous injections of botulinum toxin (n = 34) or an indistinguishable placebo (n = 32). To reduce the pain of these injections, patients first received topical lidocaine and prilocaine cream, as well as sedation with 50% nitrous oxide and oxygen.

The amount of pain from injecting an agent into an already painful area depended on the location. The injections were much more painful in the hand and less so in the abdomen, noted Dr Attal.

The protocol involved injecting 5 units of botulinum toxin, or placebo, into each site 1.5 to 2 cm apart, up to a maximum of 60 sites (300 units). The dose was determined by the size of the painful area.

Repeat Injections

The series of injections was repeated after 12 weeks in 58 patients (32 in the botulinum and 26 in the placebo groups), with the dose being adjusted according to the pain level. Of these, 52 (29 and 23, respectively) completed the study.

The mean total dose injected was similar between the two groups: 199.0 units for the first and 176.8 units for the second administration of botulinum compared with 194.1 for the first and 187.5 for the second administration of placebo.

In daily diary logs, patients recorded their pain levels over the previous 24 hours on an 11-point numeric rating scale. Mean pain intensity was 6.5 at baseline and 4.6 at 24 weeks in the botulinum toxin group (mean change, 1.9) and 6.4 at baseline and 5.8 at 24 weeks in the placebo group (mean change, 0.6).

The study showed that over 24 weeks, two successive series of injections of botulinum toxin A was superior to placebo (adjusted effect estimate vs placebo, –0.77; 95% confidence interval, –0.95 to –0.59; P < .0001).

Although the proportion of responders, defined as those with at least a 50% reduction in pain intensity, didn't differ between the groups at 24 weeks, the proportion of responders was higher in the botulinum group when a responder was considered to have experienced at least a 30% reduction in pain.

The second administration resulted in a significant therapeutic gain (least-squares mean for weeks 13 to 24, 0.91; P < .0001). After the second injection series, almost a quarter (22%) of patients went from nonresponders to responders.

"The study shows that there's an effect, and that the effect was enhanced by the second injection," commented Dr Attal.

The effects of botulinum toxin A were greater for patients with allodynia, as measured with the Neuropathic Pain Symptom Inventory (adjusted effect estimate, 0.56; P = .003).

Skin Biopsies

Fifty-five patients (29 in the botulinum toxin group and 26 in the placebo group) underwent skin punch biopsies on the painful side before randomization and 4 weeks after the first treatment.

Half the samples were analyzed for intraepidermal nerve fiber density (IENFD); for the other half, researchers quantified concentrations of the neuropeptides substance P and calcitonin gene-related peptide.

Results showed neuropeptide concentrations were similar between groups at baseline and were not modified by treatment. However, they did find that responders to botulinum toxin A had a higher baseline mean IENFD than nonresponders.

The researchers noted that limited thermal deficits at baseline were associated with better response to botulinum toxin A and that the prevalence of thermal deficits was greater in patients without allodynia.

The sensory profile characterized by preserved small-fiber function and hyperalgesia has been described as "irritable nociceptors," the authors write.

On the basis of these new results, the researchers believe that botulinum toxin may have a direct effect on nociceptive fibers and inhibits neurogenic inflammation through a blockade of neurotransmitter release.

"We suggest — and of course it's only a suggestion but it's also based on animal studies so is in line with animal data — that Botox has a central effect on pain," said Dr Attal.

Patients most likely to benefit from botulinum toxin A injections are those with peripheral pain that is localized to a specific area, those with limited thermal deficits, and those with allodynia, commented Dr Attal.

She sees botulinum toxin A as an "add on" therapy for some patients. She noted that it's not effective in all patients and, according to the study results, it's not always effective in improving mood or quality of life.

"If patients have impaired function, and are in a lot of pain, they may also need other agents" to treat conditions such as sleep problems, said Dr Attal. "Botox would not be sufficient to control everything in these patients who are very disabled."

Several Subtypes

In an accompanying comment, Ralf Baron, MD, and Andreas Binder, MD, Division of Neurological Pain Research and Therapy, Christian-Albrechts University, Kiel, Germany, noted that there are more than 40 botulinum toxin subtypes with potentially different neuronal target characteristics. These include the subtype A, which was used in the study, and subtype B, which has also been studied clinically.

Other subtypes might act more exclusively on pain fibers, sparing the effect on inhibitory interneurons, although this remains to be investigated, they said.

The editorial writers also pointed out that neuropathic pain can show different sensory profiles and that these varying profiles probably suggest different underlying pathophysiologic mechanisms of pain. These distinct patient groups probably respond differently to treatment, they said.

"Findings from the present study show that a sensory profiling approach is a valid method to identify responders to botulinum toxin A."

Because the study protocol required lidocaine and prilocaine cream plus sedation, "new delivery techniques for the toxin are needed before this method can be widely used in the clinic," they conclude.

Funding for the study was provided by Institut National de la Santé et de la Recherche Médicale (INSERM) and Fondation CNP (France). Dr Attal has received honoraria from Pfizer, Eli Lilly, Johnson & Johnson, Astellas, Sanofi Pasteur MSD, Grünenthal, and Teva for advisory boards, speakers bureaus, or clinical trials. Dr Baron has received grants or research support from Pfizer, Genzyme, Grünenthal, and Mundipharma and is a member of the IMI European collaboration, whose industry members are AstraZeneca, Pfizer, Esteve, UCB-Pharma, Sanofi Aventis, Grünenthal, Eli Lilly, and Boehringer Ingelheim. He has received speaking fees from Pfizer, Genzyme, Grünenthal, Mundipharma, Sanofi Pasteur, Medtronic, Eisai, Lilly, Boehringer Ingelheim, Astellas, Desitin, Teva Pharma, Bayer Schering, MSD, and bioCSL. He has been a consultant for Pfizer, Genzyme, Grünenthal, Mundipharma, Allergan, Sanofi Pasteur, Medtronic, Eisai, Lilly, Boehringer Ingelheim, Astellas, Novartis, Bristol-Myers Squibb, Biogen Idec, AstraZeneca, Merck, AbbVie, Daiichi Sankyo, Glenmark Pharmaceuticals, and bioCSL. Dr Binder has received personal fees from Astellas, Grünenthal, Mundipharma, and Genzyme and grants and personal fees from Pfizer.

Lancet. Published online February 29, 2016. Abstract Editorial

http://www.medscape.com/viewarticle/860783