[Peter] Koo, who owns five Star Side Pharmacies in the Flushing area, and previously worked as a pharmacist in the former Booth Memorial Hospital, accused Stavisky of landing her seat through "inheritance."
Stavisky was first elected to the Senate in November 1999 to serve out the term of her late husband, Leonard, who died while in office.
Stavisky has since won reelection in 2000, 2002, 2004 and 2006. Reubens conceded she has not faced a serious candidate since a Democratic primary in 2002 against former City Councilwoman Julia Harrison.
In the 2006 election, Stavisky got 36,134 votes, according to election results. Nine write-in candidates also got votes, including Felix the Cat and Joe Torre.
Koo said democracy demands that Stavisky be challenged.
"It's time to give voters a choice," he said.
Pharmacies owner Peter Koo eyes Toby Ann Stavisky's post in state Senate