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What to Expect During Drug and Alcohol Detox

Last Updated: February 15, 2026
3 min read Trailhead Editorial Team Clinically Reviewed

Key Takeaways

  • Drug and alcohol detox is the process of allowing your body to clear substances while managing withdrawal symptoms under medical supervision.
  • The detox timeline varies by substance — alcohol detox takes 5-7 days, opioid detox takes 7-14 days, and benzodiazepine detox can take weeks to months.
  • Medical detox uses medications to manage withdrawal symptoms safely, reducing discomfort and preventing dangerous complications.
  • Detox is NOT treatment for addiction — it is the first step that prepares you for comprehensive treatment programs like PHP and IOP.
  • The most dangerous withdrawals are from alcohol and benzodiazepines, which can cause seizures and death without medical supervision.
  • Fear of withdrawal is one of the biggest barriers to seeking treatment, but modern medical detox makes the process much more manageable.

What Is Detox?

Detox (detoxification) is the process of safely withdrawing from drugs or alcohol under medical supervision. When someone who has been regularly using a substance stops, their body goes through a period of adjustment as it clears the substance and rebalances its chemistry. This adjustment period produces withdrawal symptoms that can range from mildly uncomfortable to life-threatening, depending on the substance.

The General Detox Process

While the specifics vary by substance, most medical detox programs follow this general process:

1. Intake and Assessment (Day 1)

  • Comprehensive medical and psychological evaluation
  • Blood work and vital signs monitoring
  • Substance use history and current usage levels
  • Assessment of co-occurring medical and mental health conditions
  • Creation of an individualized detox plan

2. Stabilization (Days 1-7+)

  • Medical management of withdrawal symptoms
  • Medication administration as needed (anti-anxiety, anti-nausea, sleep aids, etc.)
  • Continuous monitoring of vital signs
  • Nutritional support and hydration
  • Emotional support from clinical staff

3. Transition to Treatment (Day 3-14)

  • Clinical team determines readiness for the next level of care
  • Introduction to treatment programming (groups, counseling)
  • Aftercare planning begins
  • Connection with outpatient treatment providers

Detox Timelines by Substance

| Substance | Onset | Peak | Duration | |-----------|-------|------|----------| | Alcohol | 6-12 hours | 24-72 hours | 5-7 days | | Opioids/Heroin | 8-24 hours | 36-72 hours | 7-14 days | | Benzodiazepines | 1-4 days | 2 weeks | Weeks to months | | Cocaine/Stimulants | Hours-days | 3-5 days | 1-2 weeks (mostly psychological) | | Marijuana | 1-3 days | 2-6 days | 1-3 weeks |

What Withdrawal Feels Like

The withdrawal experience depends heavily on the substance, but common symptoms include:

  • Anxiety, restlessness, and irritability
  • Nausea, vomiting, and diarrhea
  • Sweating, chills, and body aches
  • Insomnia and sleep disturbances
  • Rapid heart rate and elevated blood pressure
  • Cravings for the substance
  • Depression and emotional instability

If you or a loved one is facing these challenges, learn more about what to expect when you call our admissions team available at Trailhead Treatment Center in Salem, NH.

Important: Detox Is Not Treatment

One critical thing to understand is that detox alone does not treat addiction. Detox addresses the physical dependence — the body's need for the substance — but does not address the psychological, behavioral, and social factors that drive addiction.

Following detox, comprehensive treatment through a program like PHP or IOP is essential for long-term recovery. Studies consistently show that individuals who complete detox and then enter a treatment program have significantly better outcomes than those who complete detox alone.

Trailhead Treatment Center provides transitioning from detox into a structured recovery program to support lasting recovery and wellness.

Conclusion

Detox can feel intimidating, but knowing what to expect can help reduce anxiety about the process. Modern medical detox is designed to be as safe and comfortable as possible. If you or a loved one is ready to take the first step, Trailhead Treatment Center can connect you with trusted detox partners and provide seamless transition into our outpatient treatment programs.

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