A Dorchester man who had an empty, recently purchased cognac bottle in his car was allegedly driving drunk when he fishtailed his car in front of police before driving 50 miles per hour on the wrong side of the road Saturday evening, Suffolk County prosecutors said.

MBTA Transit Police officers spotted a Cadillac Deville careening down Gladeside Avenue in Mattapan just before 7 p.m. Saturday, prosecutors said. The car allegedly failed to stop before turning left on River Street, turning sideways directly in front of the officers before fishtailing and driving the wrong way up River Street at 50 miles per hour.

Officers pulled the vehicle over and approached the car, which allegedly smelled strongly of alcohol. The car’s driver, Michael A. Jones, 41, allegedly had glassy, bloodshot eyes. The officers also noticed an empty 375-ml bottle of Hennessey cognac behind the front passenger’s seat.

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When asked for his license, Jones spent five minutes fumbling through his wallet, repeatedly dropping the wallet and becoming visibly confused, District Attorney Daniel F. Conley’s office said.

As Jones stepped out of his vehicle for a battery of field sobriety tests, he began to sway left and into traffic, prompting officers to guide him to safety on the road’s shoulder. Jones failed the tests and was placed under arrest.

A search of his vehicle revealed a .40-caliber Glock Model 23 loaded with eight rounds, plus 99 rounds of ammunition and a bag with a small amount of marijuana.

Jones submitted to two Breathalyzer tests at Transit Police headquarters, blowing a 0.17 and a 0.16. During the booking process, officers found a receipt for a purchase at the Boston Liquor Depot made two hours prior to Jones’s arrest.

A plea of not guilty was automatically entered on Jones’s behalf at his arraignment Monday on charges including unlawful possession of a firearm, operating under the influence of alcohol, and negligent operation of a motor vehicle, prosecutors said.

Jones’s bail was set at $5,000, and he is ordered to wear a GPS monitor, remain alcohol-free, and abide by a curfew between 11 p.m. and 4:30 a.m.

Jones is slated to return to court April 26 for a pretrial hearing.