When more than one substance is involved
It can be hard to explain a concern when several substances or medicines are involved. You can bring them into one conversation while keeping their different effects and treatment needs clear.
Multiple substances describe a context, not one diagnosis.
Polysubstance use describes more than one substance being involved. It can be intentional or involve an unexpectedly mixed product. The substances, timing and circumstances matter; the term does not itself establish a single combined disorder.
Appropriately prescribed combinations also need their own medical context. Do not assume that every person taking several medicines has a use disorder. Tell a clinician about prescribed treatment as well as alcohol, nicotine or other substances.
One conversation can hold several different concerns.
- Substances & medicines
Include what is prescribed and what is not
- Timing & effects
Describe changes and what concerns you
- Different needs
Assessment and treatment specific to each context
- Connected support
Ask who can coordinate the plan
More than one substance can make effects harder to predict.
Substances may be combined intentionally or be present without someone knowing. Nonmedical combinations can produce unpredictable and dangerous effects. A stimulant does not cancel the effects of a sedative.
Several appropriately prescribed medicines are not automatically evidence of misuse. A clinician or pharmacist should review the actual medicines and other substances involved.
Based on CDC
Bring the whole context into view.
These are discussion areas, rather than a checklist or a prediction of an individual outcome.
What is involved
Uncertainty about what is in a product or what an interaction means.
Possible interactions
Several substances affecting sleep, mood, health or responsibilities.
Different effects
Using one substance to manage effects from another.
Coordinated care
Withdrawal concerns or difficulty knowing which change needs support first.
Separate the details, then plan care together.
A clinician can ask what is involved, including medicines, when it is used and what effects you notice. Different substances may need different assessments while one service helps coordinate care.
TAPS and ASSIST use substance-specific follow-up. Adding every result into one addiction score would lose important context. A low screen cannot establish that a combination is safe.
Based on CDC · NHS · NIDA Data Share · NIH · World Health Organization
- 1What is involved
Include prescribed medicines and other substances.
- 2What concerns you
Effects, interactions, control or withdrawal?
- 3How care connects
Who can help coordinate a safe plan and follow-up?
Give clinicians the fullest information you can.
Explain known substances, prescribed medicines and any uncertainty about what was taken. If someone is acutely unwell, seek emergency medical help instead of trying to calculate a combined risk online.
Known information
Names and recent changes you can accurately describe.
Uncertainty
Anything unknown about the substance or combination.
Current symptoms
What has changed and whether urgent care is needed.
Ongoing needs
Health, practical support and treatment access.
A little clarity. A place to start.
Explore a tool, prepare a conversation or find someone to talk to. Choose what feels useful to you.
Prepare for a conversation
A few prompts to help you explain what you have noticed and what you would like help with.
- A simple notes builder
- Copy your notes to keep
- No account needed
You decide how much to write and share.
Find your wordsFind your next kind of support
Explore where to begin with everyday support, professional help or an urgent conversation.
- Ways to ask for help
- Country-specific crisis contacts
- Support at your own pace
If you need urgent help, go straight to support.
Find supportYour first sentence does not need to be perfect.
If it helps, write the substance and medicine names privately and bring them to a clinician. Include what is prescribed and what you are worried about. This page asks for no substance-use answers and does not provide an interaction calculator.
“More than one substance or medicine is involved, and I would like help considering the whole situation and a coordinated plan.”Make it sound like you
Your questions, with room for nuance.
You can read just the answer you need.
Can two screening scores show whether a combination is safe?
No. Screening scores cannot assess toxicity or interactions. A suspected overdose or acute medical problem needs emergency care.
Based on CDC
Where this information comes from.
Use this hub to learn and prepare questions. It does not diagnose you or recommend a personal treatment plan. By Selfmora editorial; sources checked . Updated .
Additional explanations and examples: sources consulted . Examples illustrate ideas; they do not assess your personal health. Your questions
- Multiple substances: interaction and overdose context
- Recognising and responding to an overdose
- Drug concerns: getting help
- TAPS: two-stage screening instrument information
- ASSIST: primary-care manual and intervention context
- Benzodiazepines: physical dependence and withdrawal warnings
- Alcohol-use disorder and support