Ospreys and Wales wing George North has been suspended for four matches after his red card against Dragons.
The offence carried an eight-week suspension but was halved.
North's clean disciplinary record, acceptance of his actions and remorse shown warranted application of 50% maximum mitigation.
It was the first red card of North's professional career.
The British and Irish Lions wing was punished by referee Adam Jones under Law 9.17 - A player must not tackle, charge, pull, push or grasp an opponent whose feet are off the ground.
North accepted that his actions warranted a red card for foul play for the incident was deemed a mid-range offence.
As the 2020-21 season fixtures are not yet finalised, the ban will span over the course of four meaningful games starting with the final Pro14 match of the 2019-20 season against Cardiff Blues at Rodney Parade on Sunday, 30 August.
North has the the right to appeal.