"Should they go to rehab or a psych hospital?" is one of the most common questions families ask when a loved one is struggling with substance use — and the honest answer is that it depends on what's actually happening in the moment. These are different systems, built for different problems, and knowing which one fits can save a family real time during a crisis.
What each setting is actually for
| Setting | What It's For |
|---|---|
| Medical detox | Short-term, medically supervised withdrawal management — days, typically. The focus is physical safety during withdrawal, which can be medically dangerous for alcohol and benzodiazepines in particular. |
| Rehab / residential treatment | Structured, longer-term treatment (often weeks) focused on recovery: therapy, education, relapse prevention, and building a plan for ongoing sobriety. Usually follows detox, not a replacement for it. |
| Psychiatric facility | Focused on acute mental health crises — danger to self, danger to others, or grave disability from a mental health condition. Can accept involuntary holds (5150/5250) when criteria are met. |
| Dual diagnosis / co-occurring program | Treats substance use and a mental health condition together, when both are present — increasingly common, since the two frequently occur side by side. |
The deciding question: what's actually driving the crisis?
In practice, the right starting point usually comes down to one question: is the danger coming from withdrawal and substance use itself, or from an underlying mental health crisis?
- Withdrawal is the main risk (e.g., heavy daily alcohol use, benzodiazepine dependence) → medical detox or an emergency room first, since withdrawal from these substances can be medically dangerous and needs monitoring a standard psychiatric unit isn't equipped to provide.
- A mental health crisis is present — suicidal thoughts, psychosis, a plan to harm someone — regardless of substance use → a psychiatric evaluation, which may lead to a hold if criteria are met.
- Both are present — very common — start with the emergency room or a psychiatric emergency services (PES) unit; they can triage between medical detox, psychiatric admission, or a program that treats both together.
Why the line between the two has shifted
California law used to define the "gravely disabled" criterion for a psychiatric hold around mental health disorders specifically. Under SB 43, effective statewide since January 1, 2026, that definition now explicitly includes severe substance use disorder — meaning someone whose addiction alone has left them unable to provide for their own basic needs may now meet criteria for a psychiatric hold, even without a separate mental health diagnosis.
What an intervention actually looks like in practice
Families often picture "intervention" as a single dramatic conversation. In reality, it's usually a process:
- If there's no immediate danger: Contact a licensed interventionist, an addiction treatment center's admissions line, or the person's primary care provider to start the conversation about voluntary treatment. Many rehab centers have same-day or next-day intake assessments.
- If you're not sure how serious it is: Call the SAMHSA National Helpline (1-800-662-4357), free and confidential, for guidance on next steps and local treatment options.
- If there's an active mental health crisis alongside the substance use: Call or text 988, the Suicide & Crisis Lifeline, or bring the person to an emergency room or PES unit for evaluation.
A word on involuntary treatment
Substance use alone, without meeting the legal criteria described above, generally cannot be treated involuntarily the way a psychiatric crisis can. Rehab is almost always a voluntary process — the person has to agree to enter and engage with treatment. This is often the hardest part for families to accept, especially when they can see the danger clearly and their loved one can't yet. Supporting someone toward that decision — through an intervention, ongoing conversation, or simply staying connected — is frequently the actual work, even when it doesn't feel like "doing something."
The bottom line
There's no single right door — the right starting point depends on whether the immediate danger is medical (withdrawal), psychiatric (crisis), or both. When in doubt, an emergency room or psychiatric emergency services unit can evaluate and direct you to the right level of care, and a helpline call costs nothing and can clarify the picture before you're in a crisis moment.