The ICC says in a statement on Sunday that a sample provided by Shah on Nov. 13, when Pakistan played an ODI against England in the United Arab Emirates, contained chlortalidone, which is on the World Anti-Doping Authority's list of prohibited substances.
Shah could challenge the suspension and apply for the test of his B sample within seven days.
The 29-year-old Shah has taken 76 wickets in 12 test matches and 18 wickets in 15 one-day internationals.
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