Smoking cessation drugs Chantix and Zyban must carry boxed warnings because the drugs may cause depression and suicidal thoughts, the U.S. Food and Drug Administration announced Wednesday.

Dr. Janet Woodcock, director of the agency's Center for Drug Evaluation and Research, said an analysis of reports from patients and clinical trials found that some taking the drugs experienced "unusual changes in behavior, become depressed, or had their depression worsen, and had thoughts of suicide or dying

Canada's largest publicly listed pharmaceutical company Biovail Corp. acquired U.S. privately held Prestwick Pharmaceuticals Inc. for $100 million, a move that would allow the Canadian drug maker to change its focus to central nervous system medication.

Prestwick holds the Canadian and U.S. rights to Xenazine, a drug used to treat chorea, an illness related to Huntington's disease, a rare genetic disorder that could lead to memory loss, uncontrolled movements and death. The drug is approved by the Food and Drugs Administration

The U.S. Food and Drug Administration said Wednesday that a generic version of a popular name brand antidepressant is both safe and effective, despite recent consumer complaints

The federal agency reviewed the generic version of Wellbutrin manufactured by Teva after some patients reported their depression returned when they switched from the brand name drug Wellbutrin XL to the generic pharmaceutical. Some patients also complained of headaches, anxiety and other side effects

London, England (AHN)- Pharmecutical giant, Biovail has lost the patent infringement case for its hit antidepressant drug Wellbutrin XL. The ruling will allow generic copies of the drug to enter the market.

The U.S. court ruling caught the company unaware and resulted in in their stock's market value droppinga quarter

Zocor, a cholesterol-cutting drug from Merck and Zoloft, antidepressant from Pfizer are going off patent this month. Merck's patent for Zocor expires Friday while Zoloft loses patent protection on June 30.

According to a report by CNN Money, Zocor had $4.4 billion and Zoloft totaled $3.3 billion in 2005 sales