Published: 2018-01-09 20:37:43 BdST
The 35-year-old, who played the last of his 57 one-day internationals in 2012 but has been active in domestic cricket, "inadvertently ingested" a prohibited substance to treat an upper respiratory tract infection, the BCCI said in a statement on Tuesday.
A urine sample collected last year tested positive for terbutaline, which features in the World Anti-Doping Agency's list of prohibited substances.
He was provisionally suspended in October and the board, convinced by the player's explanation, backdated the start of his five-month suspension to mid-August.
"Having considered all of the evidence and taken expert external advice, the BCCI has accepted Mr Pathan's explanation ... and on that basis has agreed that a period of ineligibility of five months should apply, together with the disqualification of certain results."
Pathan, whose six-hitting ability and tidy off-spin bowling made him a limited-overs asset, is free to play from Monday.