Psychoactive drugs alter communication between brain cells. Some psychoactive substances are able to mimic the effects of neurotransmitters. Others interfere with normal brain function by blocking it, or by altering the way neurotransmitters are stored, released, and removed.Click to see full answer. Accordingly, how do drugs affect the central nervous system?Drugs are chemicals that affect the body’s structure or function. Psychoactive drugs, such as caffeine and alcohol, affect the central nervous system by influencing the transmission of nerve impulses in the brain. Psychoactive drugs may be abused and lead to drug addiction.Furthermore, which division of the nervous system is primarily altered by the effects of psychoactive drugs? A psychoactive drug or psychotropic substance is a chemical substance that acts primarily upon the central nervous system where it alters brain function, resulting in temporary changes in perception, mood, consciousness and behavior. People also ask, what drug increases nervous system activity? Stimulants, such as cocaine, nicotine, and amphetamine, increase the activity of the sympathetic nervous system, the central nervous system, or both. Stimulants generally increase heart rate, blood pressure, and one’s sense of alertness.Which psychoactive drug excites the activity of the central nervous system?Stimulants increase the activity of the central nervous system, making the person more alert and aroused. Examples of stimulants are nicotine, caffeine, cocaine, ecstasy and the methamphetamines, speed and ice. Hallucinogens make a person see, hear, smell or feel things that aren’t there.