What Is Polysubstance Addiction?

What Is Polysubstance Addiction?

Polysubstance addiction is when someone has an addiction to multiple substances.

Most people assume that this type of addiction involves a single drug or alcohol. Actually, combining or regularly using multiple drugs simultaneously is relatively common, too.

Polysubstance addiction can be more dangerous than other forms of addiction, with increased risk of health complications, and treatment tends to be more complex. It’s important to know the dangers of this addiction, so we’re going to take a closer look at what polysubstance addiction is, the potential causes, risks, symptoms, and treatment options.

 

What Is Polysubstance Addiction?

Polysubstance addiction, also known as polysubstance use disorder, is when a person develops problematic use of two or more substances at the same time or closely together.

Some common polysubstance combinations are:

  • Alcohol and cocaine
  • Alcohol and prescription medication
  • Cocaine and benzodiazepines
  • Opioids and benzodiazepines
  • Cannabis and alcohol
  • Multiple recreational drugs

Whilst in most cases, polysubstance addiction is related to illegal substances, legal substances such as alcohol are common too.

 

How Common Is Polysubstance Use?

Between 2024 and 2025, 329,646 adults were in contact with addiction services. Of this number:

  • 22% were using opiates and crack cocaine
  • 21% had problems with cannabis, commonly alongside opiates
  • Alcohol was the third most reported substance being used with opiates

People develop polysubstance use due to evolving substance use patterns. Perhaps you’ll start with a single substance and begin to experiment, seeking different effects or wanting substances to lessen or enhance what you already take. This leads to more frequent combining of substances, leading to polysubstance misuse.

 

Why Do People Use Multiple Substances?

Each person uses multiple substances for their own reasons. Despite, or perhaps not, knowing the risks, people still risk the dangers.

The main motivations behind polysubstance use include:

  • Enhancing the desired effects of existing substances
  • Counteracting negative side effects
  • To cope with mental health symptoms
  • To increase intoxication
  • Social and environmental influences
  • Developing tolerance to a substance

 

What Are the Most Common Substance Combinations?

Common substance combinations associated with in polysubstance misuse include:

  • Alcohol and cocaine
  • Opioids and benzodiazepines
  • Alcohol and prescription sedatives
  • Cannabis and alcohol
  • Ketamine and alcohol
  • Multiple stimulant drugs

Some combinations, such as ketamine and alcohol, can be particularly dangerous due to their worsening side effects of the other, increasing the risk of overdose and severe health complications.

 

Why Is Polysubstance Addiction So Dangerous?

  • Increased overdose risk – Using multiple substances at once increases the chance of an overdose. One study of overdoses in North Carolina found that polysubstance overdoses accounted for 52.5% of all fatal overdoses over ten years.
  • Unpredictable drug interactions – It’s hard to know how substances will interact. They could intensify one another, mask effects or affect your body’s ability to metabolise them.
  • Greater strain on the body – Multiple substances can put more work on your liver to metabolise them, cause cardiovascular issues and depress your respiratory system to a dangerous amount. Bodies can find it hard to cope with one toxic substance, let alone multiple ones simultaneously.
  • Increased mental health complications – Different substances can trigger mental health episodes and worsen conditions such as anxiety, depression and PTSD.
  • More severe withdrawal symptoms – Coming off more than one substance at once will mean a more intense withdrawal experience.

 

The Risks of Mixing Depressants

Depressants are substances that act on your central nervous system, slowing down everything in your body.

Mixing depressants can be extremely dangerous, bringing on respiratory depression, unconsciousness and an overdose.

Alcohol and benzodiazepines

Using alcohol and benzodiazepines amplifies the effects of the other. There is an increased risk of extreme drowsiness, loss of coordination and severe respiratory depression, which can lead to you passing out and dying.

Alcohol and opioids

Again, this combination intensifies the effects of the other. This combination can slow down your cognitive function, impairing your judgement and coordination, and leading to increased risk of injuries. You also increase the risk of overdose occurring.

Opioids and sleeping tablets

Taken together, opioids and sleeping tablets will slow down your breathing, cutting off oxygen to your brain. They can also impair motor functions, cause you to pass out and increase the chance of an overdose.

 

The Risks of Mixing Stimulants and Depressants

People combine substances with opposing effects so that they counteract one another, wanting the stimulants to bring them up after using depressants or needing to relax after feeling more energised.

Common combinations include:

  • Cocaine and alcohol – These substances can mask the effects of the other, leading you to take more and overdose. Increased amounts of cocaine will also put a strain on your cardiovascular system, putting you at risk of a heart attack.
  • Stimulants and sedatives – The counteracting effects send mixed messages to your cardiovascular system, increasing the risk of heart problems. Also, stimulants will mask the effects of sedatives. Stimulants typically wear off quicker, and when they do, your central nervous system will be dangerously depressed, causing you to stop breathing.

 

How Does Polysubstance Addiction Affect Mental Health?

Polysubstance abuse can put a significant strain on your mental health, too. Many use substances to treat mental health issues, but they end up compounding them.

Polysubstance use can lead to or worsen:

  • Anxiety
  • Depression
  • Mood instability
  • Paranoia
  • Psychosis
  • Increased emotional distress

Multiple substances can complicate both diagnosis and treatment of mental health conditions, as they can mask underlying issues, cause overlapping symptoms and interfere with therapies and make medication a dangerous route to go down, with unpredictable drug interactions likely.

 

What Are the Signs of Polysubstance Addiction?

You should be aware of the symptoms of polysubstance addiction. By knowing the signs earlier, you can take more decisive action. It’s important to remember, though, that symptoms may vary depending on the substances involved.

Common polysubstance addiction warning signs are:

  • Using multiple substances regularly
  • Cravings for more than one substance
  • Escalating use
  • Loss of control
  • Neglecting responsibilities
  • Financial difficulties
  • Relationship problems
  • Continued use despite negative consequences

 

Can You Become Physically Dependent on Multiple Substances?

Dependence is typically the physical aspect of addiction. As you take multiple substances more often, you develop a tolerance, which can then evolve into a psychological addiction as well as a physical one.

You can build up these dependencies simultaneously with multiple substances. In many cases, multiple drug addiction occurs because people use one substance to deal with the negative effects of another.

Polysubstance addiction can complicate detoxification and recovery because the different substances can cause overlapping withdrawal symptoms, worsen them, and make the timeline more uncertain.

 

What Happens During Polysubstance Withdrawal?

Polysubstance withdrawal may require professional help because it can be unpredictable. With multiple substances, it’s nearly impossible to know how severe withdrawal will last, what serious complications may come up and whether detox protocols for one substance will fail for another.

Withdrawal symptoms may differ depending on the substances. Common withdrawal symptoms include:

  • Anxiety
  • Insomnia
  • Sweating
  • Nausea
  • Tremors
  • Low mood
  • Intense cravings

 

How Is Polysubstance Addiction Diagnosed?

Polysubstance addiction is diagnosed with a thorough assessment. This type of comprehensive assessment is needed to create a treatment plan that suits your situation. With more information, a path can be plotted that means certain approaches for one substance won’t hamper the recovery efforts of the other.

This assessment will involve learning about your:

  • Substance use history
  • Mental health
  • Physical health
  • Patterns of use
  • Co-occurring disorders

All this is needed to build up a more complete picture so that the treatment you receive is as effective as possible.

 

How Is Polysubstance Addiction Treated?

Treatment for polysubstance addiction needs to be comprehensive to be effective. That means dealing with both the physical and psychological aspects of the addiction, treating them simultaneously rather than focusing on a single drug and laying a strong recovery foundation for the future.

Your two pathways are residential rehabilitation and outpatient treatment. You should pick what suits you, but residential treatment is more effective in the long run.

A typical polysubstance addiction treatment programme will follow this path:

  • Medically supervised detoxification – The process of ending your dependence on substances by stopping your consumption, with withdrawal symptoms being eased by medication.
  • Individual therapy – Therapies such as CBT and DBT can help you better understand your addiction and learn healthier coping methods.
  • Group therapy – You get the chance to interact with others, gain support, be held accountable and work through issues.
  • Relapse prevention planning – Relapse is always a possibility; being prepared lessens the chance of it happening. You’ll learn what your triggers are, the signs of relapse and what to do to prevent them from happening.
  • Ongoing aftercare – Rehab doesn’t stop after finishing the programme. Engaging with aftercare (support meetings, continued therapy) will help you with long-term recovery.

 

Treating Co-Occurring Mental Health Conditions

Addiction and mental health are closely entwined. In the UK, 74% of people entering the treatment reported having a concurrent mental health need.

Mental health conditions can be worsened by polysubstance use, but may come before. Many people with conditions such as anxiety, depression, trauma and PTSD use multiple substances to help deal with the effects of these problems.

Eventually, this results in a spiral where the substances they are taking are worsening their conditions.

To best treat co-occurring issues, an integrated treatment approach is needed. Addiction and mental health need to be dealt with simultaneously to ensure the underlying problems are confronted and that treatment methods don’t negatively impact the progress of other aspects of your mental health or recovery efforts.

 

What Is Recovery Like After Polysubstance Addiction?

Recovery can be a long journey that doesn’t end upon completing rehab.

With the appropriate support and treatment, you can make positive lifestyle changes and build healthier coping mechanisms that will stand you in good stead. With this in mind, you may be able to rebuild relationships and gain access to long-term support that can help you through your journey.

You’ll hopefully continue with support groups and learn to manage triggers, know the signs of relapse and avoid them.

Recovery is possible, and every journey starts with a single step.

 

When Should You Seek Professional Help?

There may be a time when your polysubstance abuse is too much, and you need professional help.

Signs that it may be time to reach out include:

  • Mixing substances regularly
  • Experiencing withdrawal symptoms
  • Repeated failed attempts to stop
  • Physical or mental health complications
  • Significant impacts on daily life (work/school, relationships)

If these situations are familiar, it’s never too late. Rehab Clinics Group provides a range of addiction treatment services that can help you start your recovery journey.

 

Get Professional Polysubstance Addiction Support Today

Polysubstance addiction is when you use multiple substances, and it is very dangerous as it can increase the likelihood of overdose, dependence, and serious health complications.

To effectively treat it, you need to address both addiction simultaneously and deal with any underlying mental health factors that may be the root causes.

Effective treatment is available. If your substance use is becoming difficult to control, reach out to professional support today. Contact Rehab Clinics Group for confidential and professional guidance.