Product Sales

EYLEA^® net product sales in the United States totaled $541.1 million and $359.0 million for the three months ended March 31, 2015 and 2014, respectively. In addition, ARCALYST^® net product sales totaled $3.5 million and $3.4 million for the three months ended March 31, 2015 and 2014, respectively.

For the three months ended March 31, 2015 and 2014, the Company recorded 69% and 79%, 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, distribution-related fees, 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, 2015 and 2014.



	Rebates & Chargebacks			Distribution- Related Fees			Other Sales- Related Deductions			Total
Balance as of December 31, 2014	$	3,083		$	21,166		$	532		$	24,781
Provision related to current period sales	11,353			24,781			1,383			37,517
Credits/payments	(9,779		)	(13,036		)	(1,411		)	(24,226		)
Balance as of March 31, 2015	$	4,657		$	32,911		$	504		$	38,072

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