Barr Laboratories will market a generic version of Bayer's oral contraceptive drug Yasmin in the United States, three months after Bayer's U.S. patents on the former drug were declared invalid.

In the biggest gain since May 9, the shares of Barr rose $1.97, or 4.8 percent, to $42.91 in New York Stock Exchange composite trading

Today's teenagers appear to be more behaved than their counterparts 16 years ago. According to a Center for Disease Control and Prevention report, lesser adolescents now indulge in drinking, smoking or sex.

But some ethnic groups are more prone to juvenile delinquent behavior, particularly Hispanics, the study said. The CDC Youth Risk Behavior Survey, which covered public and private high school students every two years since 1991, indicated Hispanic youths have greater tendencies to take drugs, get drunk on school premises and attempt suicide

A new study reveals that early marijuana use by teenagers may lead to a heroin addiction in later stages of their life.

Researchers claim that those who use marijuana on a regular basis during their teenage and early adult years may be using it as a 'gateway drug', which may create a craving for the chemical stimulation of harder drugs