Ranbaxy Laboratories (Bombay:RANB.BO - News) and Dr. Reddy’s Laboratories (Bombay:REDY.BO - News), India’s top makers of generic drugs for export, are expected to post listless quarterly earnings amid increased competition and a lack of big launches. With no blockbuster drug copies due soon, the trend is likely to continue for the rest of the year, analysts say.The companies have led India’s foray into selling copies of blockbusters from Western drug giants, but are now going through a slowdown.