Alcohol addiction, also known as alcohol use disorder, is a chronic condition characterized by an inability to control or stop drinking despite negative consequences. Over time, excessive alcohol use alters brain chemistry, leading to physical dependence, tolerance, and withdrawal symptoms when not drinking. This addiction can affect relationships, employment, and physical health, increasing the risk of liver disease, heart problems, and mental health issues such as depression and anxiety.

Opioid addiction occurs when a person becomes physically and psychologically dependent on opioids—drugs that include prescription painkillers such as oxycodone, hydrocodone, and morphine, as well as illicit substances like heroin or fentanyl. Opioids alter the brain’s reward system, creating powerful cravings and compulsive drug-seeking behavior. Without treatment, opioid addiction can lead to overdose, respiratory failure, and severe withdrawal symptoms that make quitting difficult without medical support.

Cocaine and stimulant use disorders involve the misuse of substances that increase energy, alertness, and euphoria—such as cocaine, methamphetamine, and certain prescription stimulants like Adderall. These drugs stimulate the central nervous system and raise dopamine levels, creating intense but short-lived highs followed by crashes and cravings.

Prolonged use can cause cardiovascular issues, sleep disturbances, mood instability, and cognitive impairments. Dependence develops quickly, often leading to cycles of binge use and withdrawal.

Prescription drug misuse refers to taking medication in a way not intended by a prescribing doctor—whether by using higher doses, taking someone else’s prescription, or using the drug to achieve a high. Commonly misused medications include opioids, benzodiazepines, and stimulants. Misuse can lead to addiction, tolerance, and dangerous withdrawal symptoms, as well as long-term physical and mental health complications.