WASHINGTON, June 18 (Reuters) - Pharmasset Inc (VRUS.O: Quote, Profile, Research) on Wednesday filed to periodically sell up to $100 million in common and preferred stock, debt securities, warrants and units.

The pharmaceutical company said in a filing with the U.S. Securities and Exchange Commission that it will use the proceeds from the offering for general corporate purposes.

Under a shelf registration, a company may sell securities in one or more separate offerings with the size, price and terms to be determined at the time of sale. (Reporting by Karey Wutkowski)