Drug interactions
Morphine + Moxonidine
Severity: Moderate
Morphine and Moxonidine: moderate 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
Moxonidine is a centrally acting antihypertensive that can cause drowsiness and sedation, and it may add to the CNS depression and hypotension seen with morphine. Dizziness and sedation may be more marked, especially at the start of treatment or after dose increases.
What this interaction means in plain words
Morphine and Moxonidine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive CNS depression and blood pressure lowering through central imidazoline/alpha-2 effects combined with opioid mu-receptor agonism.
What to do
Monitor sedation level and blood pressure when either drug is started or titrated. Use the lowest effective doses and counsel patients about fall risk.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Morphine
- Alvimopan + Morphine Contraindicated
- Isocarboxazid + Morphine Contraindicated
- Morphine + Olanzapine / samidorphan Contraindicated
- Morphine + Phenelzine Contraindicated
- Morphine + Tranylcypromine Contraindicated
- Alfentanil + Morphine Major
Frequently asked questions
Can I take Morphine with Moxonidine?
MediHelp rates the interaction as moderate. Morphine and Moxonidine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Moxonidine is a centrally acting antihypertensive that can cause drowsiness and sedation, and it may add to the CNS depression and hypotension seen with morphine. Dizziness and sedation may be more marked, especially at the start of treatment or after dose increases.
How serious is the interaction between Morphine and Moxonidine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor sedation level and blood pressure when either drug is started or titrated. Use the lowest effective doses and counsel patients about fall risk.
What other medicines interact with Morphine?
MediHelp also lists interactions of Morphine with, for example, Alvimopan, Isocarboxazid, Olanzapine / samidorphan. The full list is on the Morphine page.
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