Farmaceutisch bedrijf verzwijgt belangrijke bijwerkingen antipsychotica*
Het farmaceutische bedrijf AstraZeneca heeft moedwillig informatie achtergehouden over een duidelijk grotere kans op het krijgen van diabetes bij het gebruik van het antipsychoticum Seroquel. Verschillende studies waaruit dit bleek werden achtergehouden. Zelfs in de adviezen aan artsen werd deze reeds bekende informatie niet vermeld en erger nog het gegeven werd ontkend. Nadat ruim 15.000 mensen in Amerika rechtzaken tegen AstraZenca aangespannen hadden komt deze informatie nu aan het licht. Hier twee links waar u meer informatie kunt vinden.
Bloomberg en
WallStreetJournal.
Uit onderstaande studie blijkt trouwens dat de nieuwe antipsychotica zoals Risperdal, Zyprexa en
wederom Seroquel de kans op een fataal hartaanval duidelijk doet toenemen. Deze nieuwe medicijnen zouden veiliger moeten zijn als de oude waarbij al gewaarschuwd werd voor de kans op fatale hartaanvallen. Bij deze nieuwe medicijnen, zeker bij hoge dosering is de kans nog eens 2x groter zo blijkt uit onderzoek onder 277.000 mensen. In sommige gevallen blijken deze medicijnen nodig te zijn doch het merendeel kan waarschijnlijk beter anders
behandeld worden zeggen de onderzoekers
Newer schizophrenia drugs cause heart risks: study
Newer "atypical" drugs for schizophrenia and other mental problems, which are supposed to be safer, may in fact carry a greater risk of a fatal heart attack than older medicines, researchers said on Wednesday.
The drugs are among the best-selling in the world and some experts suggested that the common practice of using them for unapproved purposes such as dementia and childhood hyperactivity should be sharply curtailed.
Dr. Wayne Ray of the Vanderbilt University School of Medicine and colleagues studied nearly 277,000 people in Tennessee and found patients taking the highest dose had the greatest risk, and the danger faded once they stopped taking the drugs.
Ray said the findings do not necessarily mean people should stop taking their drugs. In some cases, there are no good alternative treatments.
"Any prescription is a balancing of risks and benefits. This is more information on the risks that needs to be taken into account," Ray said in a telephone interview.
"Many people thought the "atypicals" would be much, much safer. Our study suggests that they are not at all safer in regards to this serious end point," said Ray.
In June the U.S. Food and Drug Administration said older, conventional antipsychotic medications should carry a warning on the packaging about the risk of death.
The FDA issued a similar warning in 2005 for newer antipsychotic's such as Bristol-Myers Squibb Co's and Otsuka Pharmaceutical Group's Abilify and Eli Lilly and Co's Zyprexa, known generically as olanzapine.
Using files from the Tennessee Medicaid program for the poor, the researchers confirmed that the rate of fatal heart attacks was twice as high among those taking the drugs.
"A similar increased risk was seen for current users of atypical antipsychotic drugs, who had a rate of sudden cardiac death that was more than twice that for nonusers," they wrote.
The drugs studied in this group included clozapine, made generically, Johnson & Johnson's Risperdal, or risperidone, Zyprexa, and quetiapine, made by AstraZeneca under the brand name Seroquel.
Zyprexa, Risperdal and Seroquel are among the 10 top-selling drugs worldwide, with a combined sales volume of $14.5 billion in 2007. Lilly and AstraZeneca did not immediately respond to requests for comment.
The drugs can interfere with the flow of potassium, which the heart needs to function properly.
Ray said that in spite of the risks, there are no good alternatives for schizophrenia and other serious psychoses. "The take-home message from our study is for these diseases you would first want careful testing, like an EKG (electrocardiogram) and a cardiovascular workup," he said.
The antipsychotics are often prescribed for bipolar disorder, anxiety, depression and attention-deficit hyperactivity disorder (ADHD), even though their use for those purposes is not approved by the FDA.
In a commentary, Drs. Sebastian Schneeweiss and Jerry Avorn of Brigham and Women's Hospital in Boston said there was much less evidence that the drugs work for unapproved purposes, particularly for children and in the elderly with dementia.
"For these patients, the use of antipsychotic medications should be reduced sharply," they
wrote. (Februari
2009)
