What happens in the first seven days of detox?
A clear answer from the Restart team — reviewed November 2026.
The first days vary by substance: symptoms usually start within hours to two days, peak early and then gradually ease. Medical supervision relieves symptoms and prevents complications — and after the first week the real work begins: psychological and behavioural treatment.
- Days 1–3: usually the hardest
- Days 4–7: gradual physical improvement
- Cravings can last longer
- Detox alone isn't complete treatment
What happens physically?
With stimulants: exhaustion, long sleep, low mood. With opioids and tramadol: aches, sweating, diarrhoea, insomnia. With alcohol and sedatives: shaking, anxiety and possible serious complications — so medical supervision is essential.
And after the first week?
The person moves into rehabilitation that treats the causes: triggers, co-occurring conditions, routine and relationships. This is where relapse prevention is built.
How Restart helps
General educational content from the Restart team — not a substitute for a medical assessment. In an emergency, call emergency services immediately. · Last reviewed: November 2026
Medically reviewed byDr. Huthayfa BarhamMedical Director · Addiction psychiatristFAQ
What happens in the first seven days of detox?
Is detox painful?
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