Nwokocha, ran the anchor leg in Birmingham last month as Nigeria beat England and Jamaica to take gold.
A statement by the Athletics Integrity Unit said it has provisionally suspended Nigerian runner, for the Presence or Use of Prohibited Substances named Ostarine and Ligandrol.
Ostarine and Ligandrol are both anabolic agents prohibited by the World Anti-Doping Agency.
A provisional suspension means an athlete is temporarily banned from competition before a final decision is taken at a hearing conducted under WADA rules.
Nwokocha qualified for last year’s Tokyo Olympics and also entered the one hundred meters and two hundred meters at the World Championships in Eugene this year, reaching the semi-finals in both events.
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