Net Product Sales

EYLEA^® net product sales in the United States totaled $359.0 million and $313.9 million for the three months ended March 31, 2014 and 2013, respectively. In addition, ARCALYST^® net product sales totaled $3.4 million and $4.8 million for the three months ended March 31, 2014 and 2013, respectively.

For the three months ended March 31, 2014 and 2013, the Company recorded 79% and 77%, respectively, of its total gross product revenue from sales to Besse Medical, a subsidiary of AmerisourceBergen Corporation.

Revenue from product sales is recorded net of applicable provisions for rebates and chargebacks under governmental programs (including Medicaid), distribution-related fees, prompt pay discounts, and other sales-related deductions. The following table summarizes the provisions, and credits/payments, for these sales-related deductions during the three months ended March 31, 2014.



	Rebates & Chargebacks			Distribution- Related Fees			Other Sales- Related Deductions			Total
Balance as of December 31, 2013	$	4,400		$	19,663		$	538		$	24,601
Provision related to current period sales	6,886			16,858			448			24,192
Credits/payments	(6,664		)	(16,310		)	(454		)	(23,428		)
Balance as of March 31, 2014	$	4,622		$	20,211		$	532		$	25,365