Danny North, who had opened the scoring for the home side, got his second goal in the 4th minute of added time to steal the points for Pat's.
North's left-footed shot sailed into the top right of Ciaran Kelly's net to seal an impressive night of football in Inchicore.
North had put the home side ahead on 4 minutes when he pounced on John Russell's back pass and finished past Kelly.
Former Saint Alan Kirby had put Rovers back into contention on 45 minutes, in a game watched by Republic of Ireland manager Giovanni Trapattoni and his assistant Marco Tardelli.
|10||St. Patrick's Athletic||6||4|
|12||Galway United FC||5||2|