GLOBE NEWSWIRE -- Achillion Pharmaceuticals, Inc., a leader in the discovery and development of small molecule drugs to combat the most challenging infectious diseases, today announced that it has entered into a standby equity distribution agreement ("SEDA") with YA Global Master SPV, Ltd, a fund managed by Yorkville Advisors ("YA"), whereby Achillion has the option, at its sole discretion, to sell up to $15 million of common stock to YA.