Definition: In this task, you are given a text of the article. Your task is to generate a headline (title) for this article.
Input: as merck &amp; co. defends itself against litigation involving its pain reliever vioxx , the pharmaceutical giant also is fielding the first of what could be another wave of lawsuits involving fosamax , an osteoporosis drug and its second biggest seller .

merck drug fosamax may face litigation