-10.90 (-0.92%) In a bid to tap $452 million Fexofenadine drug market, Dr Reddy's Laboratories has launched the generic version of Allegra (Fexofenadine HCl) tablets in the US market. The pharmaceutical firm will market the over-the-counter (OTC) product under store brand labels in the US market. The products are bio equivalent versions of Sanofi-Aventis' Allegra tablets which received Rx-to-OTC switch approval from the FDA on January 24.crackcrack