A 47-year-old TTC bus driver will appear in court next month after he was charged by Toronto police with impaired driving on Wednesday night.

The bus was travelling along Senlac Road near Finch Avenue and Yonge Street, when it was pulled over by police.

The driver was given a field sobriety test, according to Const. Hugh Smith.

There was "enough evidence to arrest the driver for allegedly driving while impaired by drugs," Smith said.

Police said that alcohol was not a factor.

CTV Toronto's Jim Junkin reported that no passengers were on the bus at the time of the arrest.

TTC spokesman Brad Ross said that the charges are an "isolated" incident. He added that over the past two years, only two other similar charges have been filed against TTC employees.

The TTC employs about 12,000 people, Ross said, adding that the commission takes any such charges "very seriously."

Transit Union President Bob Kinnear said the driver was on prescribed medication and that he was not told that taking the drugs would cause him to be impaired.

Driver Zvi Domb was released from custody and is expected back in court on June 24.

With files from The Canadian Press