Sleep disturbances, irritability, and increases in blood pressure have been reported in people taking Noopept.[1][2] It should be stressed that there is not much research evaluating the safety of Noopept.
Given its similarities to other nootropics like piracetam and ampakines, Noopept may also cause dizziness, headaches, gastrointestinal symptoms, and impairments in memory, although these effects are speculative.[3]