Amphastar Pharma (NASDAQ:AMPH) reported quarterly earnings of $0.73 per share which missed the analyst consensus estimate of $0.92 by 20.82 percent. This is a 20.65 percent decrease over earnings of $0.92 per share from the same period last year. The company reported quarterly sales of $183.105 million which missed the analyst consensus estimate of $190.480 million by 3.87 percent. This is a 1.83 percent decrease over sales of $186.523 million the same period last year.