Commonly Abused Substances and Their Real Effects

Medical Providers:
Dr. Michael Vines, MD
Alex Spritzer, FNP, CARN-AP, PMHNP
Clinical Providers:
Natalie Foster, LPC-S, MS
Last Updated: December 8, 2025

Many people think substance misuse only happens with illegal drugs. But in reality, some of the most abused drugs in the U.S. are legal, easy to access, and even found at home. And the need for awareness is growing—more than 46 million Americans struggled with a substance use disorder in 2021, showing how widespread the problem has become.

If you or someone you care about is struggling, you’re not alone. Learning about commonly abused substances is an important step toward awareness, safety, and healing.

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Understanding Why People Turn to Substances

People use substances for many reasons. Some are searching for relief, energy, or escape. Others start for various reasons, such as stress, curiosity, or social pressure. But even legal or prescribed medications can lead to challenges when misused.

Some commonly abused drugs affect the brain’s reward system. They create short-term relief or pleasure, but over time, the brain relies on them. This is when misuse can turn into substance use disorder.

Once dependence develops, stopping can become difficult. People may experience withdrawal symptoms, cravings, or emotional distress. This cycle makes early education and support essential.

The Impact of Commonly Abused Drugs on Daily Life

The drugs most commonly abused range from prescription medications to everyday over-the-counter (OTC) drugs. While each substance works differently, they often share one thing: the ability to cause long-term harm when taken in high doses or without proper guidance.

Even a small change, such as using a pain reliever more often than recommended, can be a warning sign. Over time, misuse affects mood, sleep, work performance, and relationships. It also creates strain on both the body and mind—something many people overlook until symptoms become difficult to manage.

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Commonly Abused Prescription Drugs

Some of the commonly abused prescription drugs include opioids, benzodiazepines, and stimulants. These medications help many people when used correctly. But they can be harmful when taken at high doses, mixed with other substances, or used without a doctor’s supervision.

Opioids

Used for pain relief, opioids can lead to dependence quickly. Misuse can result in breathing problems, confusion, and severe withdrawal symptoms when stopping.

Benzodiazepines

Often prescribed for anxiety or insomnia, these medications slow the nervous system. In high amounts, they can impair memory, coordination, and judgment.

Stimulants

Commonly used for ADHD, these prescription drugs increase focus and alertness. But misuse can lead to elevated heart rate, irritability, or even long-term heart issues.

When people rely on these medications to cope, daily functioning becomes harder. Awareness helps prevent accidental misuse and supports safer alternatives.

Frequently Abused Prescription Drugs and Their Risks

Among frequently abused prescription drugs, the biggest concern is how easily they become part of someone’s routine. Because they’re prescribed by a doctor, many assume they’re always safe. But like any medication, misuse leads to real, lasting risks.

Over time, misuse can cause cognitive changes, mood swings, and physical issues like liver damage, sleep disruption, or anxiety. Some people report needing higher doses to feel the same effects, which increases danger even more.

It’s important to talk openly about prescription drug abuse so people understand it’s a health issue—not a moral failure—and that support is available.

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Commonly Abused OTC Drugs: Hidden Risks in Plain Sight

Many people are surprised to learn that some of the commonly abused OTC drugs are sold in grocery stores, pharmacies, and gas stations. These include sleep aids, pain-reliever pills, and cough medicines containing dextromethorphan (DXM).

DXM is one of the most abused drugs in the OTC category because, in high doses, it can cause hallucinations or sedation. But misuse comes with serious risks, including brain damage, rapid heart rate, and dangerous changes in high blood pressure.

Other commonly abused OTC medications include:

  • Cold and flu products
  • Motion sickness tablets
  • Certain counter medication sleep aids

When people misuse OTC drugs, they often underestimate the danger because these products seem harmless. But OTC drug abuse can become just as harmful as prescription misuse.

The Long-Term Impact of OTC Drug Abuse

Using over-the-counter OTC drugs more often than recommended can harm both physical and emotional health. Some may cause memory problems, mood shifts, or difficulty concentrating. Others may lead to long-term organ damage, especially when taken with alcohol or other medications.

DXM, for example, can cause severe liver damage when mixed with products containing acetaminophen. This is one of the biggest dangers of combining OTC drugs without reading the labels.

Early signs of OTC drug abuse include dizziness, confusion, stomach pain, or emotional withdrawal. Noticing these symptoms early gives people a chance to seek help before the situation worsens.

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Seeking Support and Exploring Safer Treatment Options

No one expects to develop problems with substances they once trusted. But whether it’s commonly abused prescription drugs, commonly abused substances, or everyday, commonly abused OTC drugs, healing is always possible.

Support doesn’t always require inpatient care. Many people benefit from outpatient programs that allow them to continue working, caring for family, and living their daily lives while getting structured support. Outpatient rehab can help individuals manage cravings, rebuild routines, and understand the root causes of misuse—without stepping away from home or work responsibilities.

At Arizona IOP, we focus on compassionate, evidence-based outpatient rehab for people affected by prescription drug abuse, OTC misuse, and long-term substance challenges. Our team provides therapy, guidance, and ongoing support so individuals can heal safely and at their own pace. If substance misuse has affected your mood, stress levels, or emotional well-being, we’re here to help you find a healthier path forward.

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