The son of former Scottish international Craig Chalmers has been banned from the game for two years after admitting using prohibited substances.
19-year-old Melrose Utility Back Sam Chalmers has described his actions as "stupid, naive and desperate."
He tested positive for anabolic steroids at a Scotland Under-20's training session in May.
Scottish rugby legend Craig Chalmers has announced that he will quit as head coach of Melrose RFC at the end of the season.
The 44-year-old stand-off made 60 appearances for Scotland and won six championships, the National Cup and two Melrose Sevens medals as a player.
He led Melrose RFC to two championships and four cup finals, as well as three years od British and Irish CUP involvement.
Mr Chalmers said:
"I have made the decision to move to London for personal reasons. I have accepted a rugby position in that area and look forward to the new challenges that lie ahead.
"It has been an honour to have coached Melrose during such a successful period of its history.
"However, the time is right for me to move on."
Melrose RFC president John Reed said:
“Craig has been an outstanding servant of Melrose RFC both as a player and coach. No one is more passionate about Scottish rugby than Craig Chalmer.
“Quite simply his record speaks for itself and he is undoubtedly the most successful individual our club has ever produced.
“Everyone at the club wishes him well and the best of luck for the future."