The target here, Lipitor, not only reduces bad cholesterol but also is effective in preventing strokes.
Access to clean water and good hygiene practices are extremely effective in preventing childhood diarrhoea.
But have they been effective in preventing those most vulnerable from becoming gambling addicts?
BBC: NEWS | Programmes | Documentary Archive | Place Your Bets
Studies show that it's about 90% effective in preventing breast cancer in moderate and high-risk women.
There is also a chickenpox vaccine, given to children, which is at least 70 percent effective in preventing chickenpox infection.
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Some researchers have argued that HDL created this way won't be effective in preventing heart attacks and might even be harmful.
By in large, the various regulators have not been effective in preventing or even catching fraud until the damage has been done.
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One study reported that the vaccine candidate was 53% effective in preventing episodes of clinical malaria in children five to 17 months old.
But after a decade of experience, it's still uncertain whether partial-breast irradiation is as effective in preventing recurrence and prolonging survival as whole-breast irradiation.
In another trial called PrEP -- pre-exposure prophylaxis -- the CDC is also studying whether antiretroviral pills are safe and effective in preventing HIV infection.
For example, it says there needs to be a scaling up of efforts to offer circumcision to men, which trials have shown is effective in preventing some new infections.
The most important presentation shows studies that its Avastin drug works against certain lung and breast tumors and that Herceptin, a breast cancer drug, is effective in preventing tumors from returning.
However, it is less effective at preventing TB in the lungs, which is where adults and teenagers tends to be infected.
The two-and-a-half-year-old CAPRISA trial followed nearly 900 HIV-negative, sexually active South African women between ages 18 and 40 to determine how safe and effective tenofovir gel was in preventing HIV infection.
Although the ice-minus bacteria proved safe and effective at preventing frost damage in field trials, further research and commercialization were discouraged by the combination of onerous government regulation, the inflated expense of doing the experiments and the prospect of huge downstream costs of pesticide registration.
For 18 years, the Violence Against Women Act has never been a partisan issue, and now, a law that has clearly been effective in saving lives, in preventing violence, in holding offenders accountable, and in redefining the moral fabric of our society, is in question.
FORBES: Why Do Republicans Oppose Reauthorizing the Violence Against Women Act?
But an additional indication, for acutely ill medical patients at risk for VTE, does not appear likely in the near future, as a new trial published in the New England Journal of Medicine shows that one of these novel drugs, though effective at preventing VTE, also resulted in a significant increase in bleeding risk.
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Tysabri, which is infused monthly, was approved in 2004 and is more effective than other drugs at preventing MS relapses that destroy the connections between nerves in the brain and spinal cord.
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Multiple clinical trials have shown that cardiac stents are no more effective than drugs or lifestyle changes in preventing heart attacks or death.
The SEAS data can also be used to argue that a key ingredient in Vytorin is not effective at preventing heart attacks (see sidebar: "Efficacy Questions Still Dog Vytorin").
It was gradually replaced by lumpectomy and whole-breast irradiation after several long-term, randomized trials showed this treatment was as effective as removing the entire breast in preventing cancer recurrence and prolonging survival.
It is very effective at preventing severe TB, such as TB meningitis, in children.
"This decision is a step in the right direction for increased access to a product that is a safe and effective method of preventing unintended pregnancies, " said Sen.
One of the unfortunate paradoxes of the post-September 11 environment is that the further in time we move from that horrible day, and the more effective our security agencies become at preventing another successful terrorist attack on American soil, the more susceptible many Americans become to the notion that the terrorist threat has receded.
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