Armstrong was charged by South Australian police after he recorded a blood-alcohol reading of .213 on September 16 this year.
As well as the four-match ban, Armstrong was also fined the maximum possible $5000 by the club and will be required to attend psychological counselling on a weekly basis for one month, fortnightly for two months and then monthly if deemed necessary.
Armstrong will also attend a rehabilitation clinic for victims of car accidents and participate in programs to promote indigenous health and sport.
Adelaide football manager Phil Harper said the penalties were decided after recommendations from the club’s behaviour committee and leadership group.
"These penalties are particularly strong given that Tony chose to avoid contact with the club and his management in the 24 hours after the offence, which put the club, AFL and his teammates in an awkward position in trying to determine what had actually happened," Harper said.
"Tony is extremely remorseful and has vowed to accept any penalty handed to him by the club and the courts. He also vowed to work hard to regain the trust of his teammates and other colleagues at the Adelaide Football Club."
