The Clinical Opiate Withdrawal Scale (COWS) is the standardized tool clinicians use to measure withdrawal severity — understanding it can help you make sense of what a provider is assessing, and why timing matters for starting buprenorphine.
What it measures
COWS scores 11 categories of withdrawal signs and symptoms, each rated for severity:
- Resting pulse rate
- Sweating
- Restlessness
- Pupil size
- Bone or joint aches
- Runny nose or tearing
- GI upset (nausea, vomiting, diarrhea, cramping)
- Tremor
- Yawning
- Anxiety or irritability
- Gooseflesh skin
Each is scored, and the total is added up.
What the score ranges mean
- 5–12: mild withdrawal
- 13–24: moderate withdrawal
- 25–36: moderately severe withdrawal
- More than 36: severe withdrawal
Why this matters practically — buprenorphine timing
Starting buprenorphine before withdrawal has progressed enough can trigger precipitated withdrawal [link to that article]. Many providers use a COWS score — often in the moderate range (commonly cited around 8–12 or higher, though standards vary by provider and by opioid involved) — as one signal that enough withdrawal has begun to start buprenorphine more safely.
Why this isn’t something to self-administer as a home test
COWS is designed to be scored by a trained observer assessing someone in person — several items (pupil size, tremor, pulse) benefit from clinical observation. It’s included here so you understand what your provider is doing and why, not as a tool to self-score and self-medicate based on the result.
Medically reviewed by [pending]. Source: Wesson & Ling (2003), the original COWS validation study; SAMHSA TIP 63.