Product Sales

EYLEA^® net product sales in the United States totaled $780.9 million and $541.1 million for the three months ended March 31, 2016 and 2015, respectively. In addition, ARCALYST^® net product sales totaled $3.3 million and $3.5 million for the three months ended March 31, 2016 and 2015, respectively.

For the three months ended March 31, 2016 and 2015, the Company recorded 60% and 69%, 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, 2016 and 2015.



	Rebates & Chargebacks			Distribution- Related Fees			Other Sales- Related Deductions			Total
Balance as of December 31, 2015	$	6,419		$	48,313		$	517		$	55,249
Provision related to current period sales	18,885			35,788			2,910			57,583
Credits/payments	(17,457		)	(50,353		)	(2,557		)	(70,367		)
Balance as of March 31, 2016	$	7,847		$	33,748		$	870		$	42,465

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