Viagra
Sabe-se agora que Mr Magoo é desde há muito um fanático utilizador do Viagra, o célebre medicamento para a impotência, devendo-se a tal facto a sua conhecida falta de visão (link)
sábado, maio 28
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FDA conclui que Viagra não provoca cegueira
A autoridade norte-americana que regula o sector do medicamento (FDA) avançou ontem que não existe qualquer relação entre o Viagra e os casos de cegueira detectados entre os utilizadores do medicamento para a impotência. À FDA chegaram registos de 42 casos de cegueira, 38 dos quais atribuídos ao Viagra e os restantes ao seu concorrente Cialis, um número "muito pequeno" face aos milhões de pessoas em todo o mundo que consomem estes medicamentos. Os casos de cegueira reportados surgem geralmente em pessoas com diabetes ou problemas cardíacos, quer tomem ou não Viagra, disse a porta-voz da FDA. O organismo reuniu-se com o laboratório fabricante do Viagra, a Pfizer, para estudar uma eventual alteração ao folheto do medicamento em que este risco fosse mencionado. Mas ontem a porta-voz da FDA afastou essa hipótese, acrescentando que o folheto já menciona o risco potencial de utilização do Viagra em pessoas com problemas cardiovasculares. Segundo revelou ontem a Pfizer, nos ensaios clínicos de Viagra, efectuados em 13 mil homens, não foi registado qualquer caso deste tipo de cegueira.
JPúblico
Esperem pela volta...
Como tem acontecido em relação a outros casos vamos assistir, por certo, a novos desenvolvimentos futuros.
Isto das contra indicações só a conta gotas.
Os laboratórios fabricantes na mira de tirar o maior proveito das suas invenções são muito poupadinhos no que diz respeito a incluir todas as contra indicações na bula dos medicamentos.
Faço votos para que não haja mais nada a dizer sobre este medicamemnto.
Não por causa da Pfizer que está bem e recomenda-se.
Mas sim porque o Viagra é sem dúvida uma das maiores invenções deste século.
Um verdadeiro elixir da felicidade para aqueles que já pensavam ter chegado ao fim dos prazeres desta vida.
Vision Loss Is Reported in a Few Users of Viagra
By ALEX BERENSON and JENNIFER BAYOT
Published: May 28, 2005
The Food and Drug Administration said yesterday that it had received reports of partial vision loss in 38 men taking Viagra, the impotence drug, and among 4 men taking Cialis, a newer competitor.
The F.D.A. has asked Pfizer, the maker of Viagra, to add a note to the drug's label so that patients are aware of the possible link. The makers of Cialis - Eli Lilly & Company and the Icos Corporation - have already made such a change.
More than 23 million men have taken Viagra since Pfizer began selling the drug in 1998, and millions have taken Cialis since its introduction in 2003. Doctors and industry analysts said that the drugs appear to have little risk of causing blindness.
Still, the potential side effect attracted wide attention yesterday, with heavy media coverage and talk-show hosts unleashing a host of predictable jokes. The heightened response may also be a reflection of the turmoil and uncertainty surrounding the pharmaceutical industry. Drug makers have faced increasing scrutiny since Merck withdrew its widely prescribed painkiller, Vioxx, from the market last year after a study linked the drug to heart problems.
Impotence drugs are generally safe, urologists said. The cases reported to the F.D.A. yesterday result from poor blood flow in the blood vessels around the eye, a disorder known as nonarteritic anterior ischemic optic neuropathy, or Naion. The condition generally occurs among people over 50 who have conditions like diabetes, heart disease, high blood pressure and high cholesterol - factors that also contribute to erectile dysfunction.
Dr. James Barada of the Center for Sexual Health in Albany said that he planned to continue prescribing Viagra and other impotence drugs. The eye disease "shares all the same risk factors for erectile dysfunction," he said. "Erectile dysfunction is a vascular disease of the penis; Naion is a vascular disease of the eye."
John P. Mulhall, director of sexual medicine in the urology department of NewYork-Presbyterian Hospital/Weill Cornell Medical Center, agreed. "It is entirely feasible that men who are at risk for Naion are at risk for erectile dysfunction and, in fact, are the people most likely to be using Viagra," he said.
Dr. Mulhall, who has advised several drug companies, including Pfizer, said that he had prescribed Viagra to at least 6,000 patients since 1998 and that none had reported vision loss.
The disease usually affects one eye and does not always cause permanent vision loss, doctors said.
Suzanne Trevino, a spokeswoman for the F.D.A., said that the agency did not know if Viagra was responsible for the condition. "We're not able to specifically say that these 38 cases are a result of the patients taking Viagra," she said. Ms. Trevino said that one patient who took Levitra, a third impotence drug, had reported vision loss. Levitra is made by Bayer and GlaxoSmithKline and marketed by the Schering-Plough Corporation.
Dr. Michael Berelowitz, Pfizer's vice president for worldwide medical, said that Pfizer had not seen any cases of the disease in more than 100 clinical trials that covered 13,000 men. The eye disease is uncommon, affecting 2 to 10 of every 100,000 people.
"We've studied all our databases right now, and we see no signal of causation with Viagra," Dr. Berelowitz said. He said that Pfizer would continue to study the drug for a potential link. Pfizer is continuing negotiation over the change to its label but is expected to add it. Pfizer stock fell 55 cents, or 1.9 percent, to $28.35, a reaction that analysts called excessive.
"It may not be the drug at all, it may just be the patient population that's experiencing this blindness," said David Moskowitz, an analyst at Friedman, Billings, Ramsey. "We think this was an overreaction today."
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