When Can You Smoke Marijuana After Stopping Ativan?
You can smoke marijuana immediately after stopping lorazepam (Ativan) from a drug interaction perspective, as there are no documented pharmacological contraindications between cannabis and benzodiazepines. However, the timing should be guided primarily by your withdrawal status and CNS recovery rather than a specific waiting period.
Key Considerations
No Direct Drug Interaction
The available evidence shows that cannabis use is not contraindicated with benzodiazepines from a pharmacological standpoint 1. Studies examining perioperative cannabis use found no contraindications between cannabis and various CNS medications, and there is limited evidence of significant drug interactions between cannabinoids and benzodiazepine systems 1.
The Real Issue: Withdrawal and CNS Depression
The critical factor is not the interaction itself, but rather:
Lorazepam withdrawal timeline matters more than drug clearance. Lorazepam has a relatively short half-life (10-20 hours), meaning the drug clears your system within 2-3 days. However, withdrawal symptoms typically peak between days 2-6 after stopping and can last 4-14 days 2. Some patients experience protracted withdrawal lasting weeks to months 3.
Why This Matters for Cannabis Use
Both substances cause CNS depression, and cannabis may mask or complicate withdrawal symptoms:
- Withdrawal symptoms from lorazepam include: anxiety, irritability, insomnia, restlessness, tremor, and in severe cases, seizures 4, 5
- Cannabis effects include: sedation, anxiety relief (or paradoxically anxiety in some users), and altered perception 6
- Cannabis withdrawal itself (if you're a regular user) includes irritability, anxiety, sleep problems, and decreased appetite 2
Practical Recommendation Algorithm
If you stopped lorazepam after short-term use (< 2 weeks):
- Wait at least 48-72 hours to allow the drug to clear and assess for rebound anxiety 3
- Monitor for excessive sedation if using cannabis during this period
If you stopped lorazepam after long-term use (> 3 months):
- Wait at least 7-14 days to allow peak withdrawal symptoms to pass 4, 2
- This allows you to distinguish between benzodiazepine withdrawal and cannabis effects
- Using cannabis during acute withdrawal may mask dangerous symptoms (like emerging seizure risk) or worsen anxiety
If you're tapering lorazepam (recommended approach):
- Cannabis can be used cautiously during taper, but be aware it may complicate symptom assessment
- Avoid using cannabis to self-medicate withdrawal symptoms, as this substitutes one CNS depressant for another
Critical Warnings
⚠️ Common Pitfalls:
- Don't use cannabis to treat benzodiazepine withdrawal symptoms - this can lead to cannabis dependence and doesn't address the underlying withdrawal syndrome 6
- Smoking (tobacco or cannabis) increases lorazepam clearance 7, but this is irrelevant once you've stopped the medication
- Cannabis can cause paradoxical anxiety in some users, which may be confused with withdrawal anxiety 6
- If you experience severe withdrawal (confusion, seizures, severe agitation), seek immediate medical attention - don't attempt to self-treat with cannabis 3
Special Populations
If you have a history of:
- Cannabis use disorder: Be cautious, as you're at higher risk for substituting dependencies 6
- Psychotic disorders: Cannabis may trigger or worsen symptoms 6
- Cardiovascular disease: Cannabis smoking carries cardiovascular risks including MI and stroke 6
Bottom Line
From a pure pharmacological standpoint, there's no mandatory waiting period. However, waiting 7-14 days after stopping lorazepam allows you to safely navigate the withdrawal period and make informed decisions about cannabis use without confounding symptoms. The FDA label emphasizes that CNS depressant tolerance is diminished in the presence of benzodiazepines and recommends avoiding or reducing CNS depressants for 24-48 hours after injectable lorazepam 3, though this applies more to acute medical settings than chronic oral use.
If you were on lorazepam long-term, strongly consider medical supervision for discontinuation rather than stopping abruptly 3, as this significantly reduces morbidity and mortality risks from withdrawal complications.