Drug interactions
Baclofen + Lorazepam
Severity: Major
Baclofen and Lorazepam: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Benzodiazepines and baclofen both depress the CNS, and combined use can cause pronounced sedation, hypotonia, ataxia and respiratory depression. The risk is higher in older patients, those with renal impairment and with higher doses.
What this interaction means in plain words
Baclofen and Lorazepam can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Baclofen belongs to Musculoskeletal; Lorazepam belongs to Central Nervous System.
Why it happens
Additive CNS and respiratory depression via GABA-A potentiation (lorazepam) and GABA-B agonism (baclofen).
What to do
Use the lowest effective doses for the shortest time and monitor sedation and respiration. Counsel against alcohol and driving, and avoid the combination where possible in frail patients.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Baclofen
Other interactions of Lorazepam
Frequently asked questions
Can I take Baclofen with Lorazepam?
MediHelp rates the interaction as major. Baclofen and Lorazepam can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Benzodiazepines and baclofen both depress the CNS, and combined use can cause pronounced sedation, hypotonia, ataxia and respiratory depression. The risk is higher in older patients, those with renal impairment and with higher doses.
How serious is the interaction between Baclofen and Lorazepam?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective doses for the shortest time and monitor sedation and respiration. Counsel against alcohol and driving, and avoid the combination where possible in frail patients.
What other medicines interact with Baclofen?
MediHelp also lists interactions of Baclofen with, for example, Alfentanil, Amobarbital, Belladonna and opium. The full list is on the Baclofen page.
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