Drug interactions
Diamorphine + Loxapine
Severity: Major
Diamorphine and Loxapine: major interaction.
Last updated Sources: US FDA label
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
Diamorphine (heroin) combined with loxapine can produce additive sedation, hypotension, and respiratory depression. Loxapine can also impair breathing in overdose.
What this interaction means in plain words
Diamorphine and Loxapine 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.
Why it happens
Additive CNS and respiratory depression from opioid agonism and antipsychotic sedation.
What to do
Use the lowest effective doses and monitor sedation level, respiratory rate, and blood pressure. Avoid additional CNS depressants and counsel patients on risks of impaired alertness.
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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References
Other interactions of Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Frequently asked questions
Can I take Diamorphine with Loxapine?
MediHelp rates the interaction as major. Diamorphine and Loxapine 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. Diamorphine (heroin) combined with loxapine can produce additive sedation, hypotension, and respiratory depression. Loxapine can also impair breathing in overdose.
How serious is the interaction between Diamorphine and Loxapine?
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 and monitor sedation level, respiratory rate, and blood pressure. Avoid additional CNS depressants and counsel patients on risks of impaired alertness.
What other medicines interact with Loxapine?
MediHelp also lists interactions of Loxapine with, for example, Alfentanil, Alprazolam, Amisulpride. The full list is on the Loxapine page.
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