The Turkish athlete has also been banned for eight years, the Court of Arbitration for Sport confirmed.
An appeal by world governing body the IAAF was upheld after the 29-year-old was cleared in Turkey.
Straight after the race, Britain's Lisa Dobriskey, who finished ninth, told BBC Radio 5 live: "I don't believe I'm competing on a level playing field."
Alptekin served a two-year ban after a positive test as a junior in 2004.
Her competitive results obtained since July 2010 have been disqualified after abnormal values were found in blood samples.
The case comes amid a series of allegations of doping in athletics madeby the Sunday Times and a German broadcaster.
Last week the IAAF said it was suspending 28 athletes as a result of suspicious findings in doping tests.
Credit: BBC
Credit: BBC
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