The 27-year-old Troicki was found guilty of failing to provide a blood sample during a drugs test at the Monte Carlo Masters in April.
"Mr Troicki provided a urine sample, but did not provide a blood sample," said an ITF statement yesterday.
"He asserted to an independent tribunal that he was assured by the doping control officer (DCO) that it would be acceptable not to provide a sample on account of him feeling unwell that day.
His failure to provide a blood sample at Monte Carlo, where he was knocked out in the first round, constituted a dope test failure, said the ITF, despite the player's insistence that he was under stress at the time.
"The tribunal determined that he is suspended from participation for a period of 18 months, and so ending at midnight on 24 January 2015," added the statement.
His only tour title came in 2010 when he captured the Moscow indoors event.
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