Addiction can be defined by the inability for one to stop. Not when it threatens your health. It shouldn't be used to cause financial, emotional, and other problems for yourself or your loved ones. Even if you are determined to quit, your need for drugs may consume you at any hour of day.
Effect on Your Brain Then you are motivated to do it again and again.
                
 
Most drugs have a negative effect on the brain's reward circuit, causing euphoria along with flood it in the chemical messenger dopamine. A healthy reward system can motivate people to engage in the behaviors that will help them thrive. Dopamine overdoses in the reward system can lead to the reinforcement of unhealthy behaviors, such as drug abuse. People will then continue repeating the behavior.
What happens in the brain when someone takes drug?
 
Drug addiction isn’t about just heroin, cocaine, or other illegal drugs. You can get addicted to alcohol, nicotine, sleep and anti-anxiety medications, and other legal substances.
A variety of drugs can lead to drug addiction, including heroin, cocaine, and illegal drugs. Addiction can occur from alcohol, nicotine, sleep aids or anti-anxiety medications. 
                                            
                                             
What is Drug Addiction? Addiction can be described as a mental disorder that affects the brain and behavior. You can't stop using drugs if you are addicted to them. You can avoid some of the most severe consequences of drug addiction if you seek treatment as soon as possible.
Many people don't know why or how some people get hooked on drugs. They might think that people who use drugs don't have any morals or willpower and that they could just stop if they wanted to. In reality, drug addiction is a complicated disease, and most people need more than just good intentions or a strong will to stop using. The way drugs change the brain makes it hard to stop, even for people who want to. Researchers now know more than ever before about how drugs affect the brain, and they have found ways to help people who are addicted to drugs get better and live productive lives. 
  
What happens when someone takes drugs to their brain?
To avoid suffering from pain medicine addiction, make sure you always follow your doctor's instructions when taking any medication. You should talk with your doctor if you or someone in your family have a history or addiction to drugs.
 
Your brain will eventually adapt to the increased levels of dopamine. You may have to take more medication to achieve the same result. Others that once brought you joy, like food and family time, might no longer bring you joy.
Brain abnormalities that occur over time as a result of chronic drug use provide a challenge to the self-control of a person who is addicted to drugs and interfere with their capacity to resist overwhelming desires to use drugs. It's little wonder that drug dependence often manifests as relapses. 
How to stop being dependent on prescription painkillers. Even if the patient takes the medication for a long time, most people don't develop an addiction to painkillers. Fears of addiction should not discourage you from taking pain medication. If you are a relapser or have relatives who have, your chances of getting addicted to drugs or alcohol could increase.
Most drugs cause the brain to "reward circuit" and trigger euphoria. Dopamine also floods the brain with chemical messengers. If the reward system is functioning properly, it motivates people to perform vital behaviors such as eating or spending time with loved ones. In the reward circuit, dopamine spikes can reinforce unhealthy and pleasurable behaviors like using drugs. This encourages people to keep repeating the same behavior.