Semax should be used under clinician guidance, especially when a patient takes medications for attention, anxiety, depression, sleep, or other neurologic conditions. Long-term U.S. safety data are limited compared with established prescription cognitive or psychiatric medications, so Your clinician will review your full medication list and baseline symptoms before treatment. With an intranasal product, nasal dryness, irritation, headache, taste changes, or local discomfort are possible. Patients should also report unexpected mood changes, marked stimulation, sleep disruption, neurologic symptoms, or allergic reactions.