Drug interactions
Flecainide + Macimorelin
Severity: Major
Flecainide and Macimorelin: 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
Macimorelin causes a modest prolongation of the QT interval, and flecainide can add to proarrhythmic risk. Together they may increase the chance of torsade de pointes. The risk is most relevant in patients with structural heart disease or electrolyte disturbances.
What this interaction means in plain words
Flecainide and Macimorelin 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.
Flecainide belongs to Cardiovascular; Macimorelin belongs to Endocrine.
Why it happens
Additive effects on cardiac repolarization and conduction.
What to do
Avoid using macimorelin for growth hormone testing while the patient is taking flecainide; if testing is essential, allow adequate washout of flecainide where clinically safe, or use another diagnostic agent. Correct potassium and magnesium before testing.
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 Flecainide
- Flecainide + Nirmatrelvir Contraindicated
- Flecainide + Nirmatrelvir / ritonavir Contraindicated
- Flecainide + Pimozide Contraindicated
- Flecainide + Ritonavir Contraindicated
- Flecainide + Thioridazine Contraindicated
- Flecainide + Tipranavir Contraindicated
Other interactions of Macimorelin
Frequently asked questions
Can I take Flecainide with Macimorelin?
MediHelp rates the interaction as major. Flecainide and Macimorelin 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. Macimorelin causes a modest prolongation of the QT interval, and flecainide can add to proarrhythmic risk. Together they may increase the chance of torsade de pointes. The risk is most relevant in patients with structural heart disease or electrolyte disturbances.
How serious is the interaction between Flecainide and Macimorelin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid using macimorelin for growth hormone testing while the patient is taking flecainide; if testing is essential, allow adequate washout of flecainide where clinically safe, or use another diagnostic agent. Correct potassium and magnesium before testing.
What other medicines interact with Flecainide?
MediHelp also lists interactions of Flecainide with, for example, Nirmatrelvir, Nirmatrelvir / ritonavir, Pimozide. The full list is on the Flecainide page.
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