"AMPYRA sales were pressured in the first part of the quarter, consistent with the seasonal pattern we have seen in prior years and in line with our internal projections. Sales rebounded strongly in March and continued to increase in April. Underlying consumer demand also remained strong and we are maintaining our 2013 AMPYRA net sales guidance of $285-$315 million," said Ron Cohen, M.D., Acorda Therapeutics' President and CEO. "Seasonal factors included patients switching insurance plans as well as some additional year-end inventory build and subsequent destocking."