Drug interactions
Lofexidine + Trimipramine
Severity: Moderate
Lofexidine and Trimipramine: 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
Both drugs cause sedation and hypotension, and lofexidine can prolong the QT interval, as can trimipramine. Tricyclics may also blunt the antihypertensive effect of alpha-2 agonists such as lofexidine, making the effect unpredictable.
What this interaction means in plain words
Lofexidine and Trimipramine 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.
Lofexidine belongs to Central Nervous System; Trimipramine belongs to Central Nervous System.
Why it happens
Additive sedation and QT prolongation, with tricyclic antagonism of alpha-2 agonist effects.
What to do
Obtain a baseline ECG and monitor blood pressure, heart rate and sedation. Keep electrolytes normal and review the need for the combination.
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 Trimipramine
- Disopyramide + Trimipramine Contraindicated
- Dofetilide + Trimipramine Contraindicated
- Ibutilide + Trimipramine Contraindicated
- Isocarboxazid + Trimipramine Contraindicated
- Pentamidine + Trimipramine Contraindicated
- Phenelzine + Trimipramine Contraindicated
Other interactions of Lofexidine
- Adagrasib + Lofexidine Major
- Alfuzosin + Lofexidine Major
- Amiodarone + Lofexidine Major
- Amisulpride + Lofexidine Major
- Anagrelide + Lofexidine Major
- Apomorphine + Lofexidine Major
Frequently asked questions
Can I take Lofexidine with Trimipramine?
MediHelp rates the interaction as moderate. Lofexidine and Trimipramine 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. Both drugs cause sedation and hypotension, and lofexidine can prolong the QT interval, as can trimipramine. Tricyclics may also blunt the antihypertensive effect of alpha-2 agonists such as lofexidine, making the effect unpredictable.
How serious is the interaction between Lofexidine and Trimipramine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and monitor blood pressure, heart rate and sedation. Keep electrolytes normal and review the need for the combination.
What other medicines interact with Trimipramine?
MediHelp also lists interactions of Trimipramine with, for example, Disopyramide, Dofetilide, Ibutilide. The full list is on the Trimipramine page.
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