Narcotics: Narcotics decrease sensitivity to sensory stimuli because they have a depressant effect on the central nervous system. Opium, morphine, codeine, heroin, meperidine and methadone are types of narcotics. Natural and synthetic opioids are considered medically valuable because they are effective pain relievers. The effects of opioids are reduced physical activity and drowsiness. After consuming opioids you may experience unpleasant sensations such as nausea, vomiting and itching. Excessive use of opioids leads to addiction, both physical and psychological. Sedatives: Sedatives have a depressant effect on the central nervous system and are used to treat epilepsy, hypertension, mental disorders and insomnia. Overdose can easily occur and even fatal withdrawal can occur. Emotions become unpredictable, slurred speech becomes evident. Sedatives are another example of withdrawal and fatal addiction. Withdrawal can cause seizures because it is related to it. Alcohol: Ethyl alcohol is the most widely used drug and is labeled as a central nervous system depressant. The reason it is so well known and its effects are also well known is because drinking alcohol is socially acceptable. Such effects are a slight euphoria and a decrease in inhibitions. Alcohol can also cause feelings of depression, decreased activity and/or sleep. Control centers in the brain become depressed and drunkenness occurs when the depressed brainstem releases inhibitions ...