WASHINGTON (Reuters) - Oral cough and cold medicines sold over the counter should not be used in children younger than 4 years old because of the risk of rare complications linked to inappropriate use, manufacturers said on Tuesday.

LONDON (Reuters) - Police could one day predict the surname of male suspects or victims of crime from DNA alone, British researchers said on Wednesday.

WASHINGTON (Reuters) - There is not enough evidence to say circumcision protects men from getting the AIDS virus during sex with other men even as studies show it protects them when having sex with women, U.S. researchers said on Tuesday.

LONDON (Reuters) - The herbal remedy St. John's Wort effectively treats symptoms of major depression, an analysis of previous studies found on Wednesday.

LONDON (Reuters) - A simple ultrasound scan works as well at spotting deep vein blood clots as a costly and time-consuming technique requiring more advanced equipment, Italian researchers said on Wednesday.

WASHINGTON (Reuters) - Adults should aim to get in 2 1/2 hours of exercise a week and children should run and play for at least an hour a day, according to new exercise guidelines issued by the U.S. government on Tuesday.

WASHINGTON (Reuters) - Talking about death may be upsetting but a doctor's frank discussion with a terminally ill person does no harm and provides numerous benefits for patients and those close to them, U.S. researchers said on Tuesday.

LONDON (Reuters) - An international effort to eliminate elephantiasis is on track and has protected millions of children against the disfiguring disease, proving to be one of the "best buys" in public health, researchers said on Wednesday.

WASHINGTON (Reuters) - Two television commercials for Bayer AG's birth control pill Yaz give a misleading impression of its benefits, U.S. health regulators warned the company in a letter released on Tuesday.

LOS ANGELES (Reuters) - The director of the White House war on drugs said on Monday that Internet videos that show people getting high pose a dangerous threat to teenagers by encouraging them to use drugs and alcohol.