Relugolix and Piperaquine: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Piperaquine
No brand names on recordRelugolix
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Both piperaquine (a malaria medicine) and relugolix (Orgovyx, used for prostate cancer) can affect your heart's rhythm in the same way. Each one can slightly stretch out the time your heart takes to reset between beats. This is called QT prolongation. When two drugs that both do this are taken together, the effect can add up and, in rare cases, lead to a dangerous heartbeat.
Because of this, using them together is generally not recommended at all. The good news is your care team can plan around this. If you have been prescribed both, don't stop anything on your own, just reach out to your pharmacist or doctor so they can find a safer path for you.
Effect: Additive risk of QT interval prolongation when piperaquine is combined with relugolix.
Mechanism: Both agents independently prolong the QT interval; combined use produces additive pharmacodynamic effect on cardiac repolarization. This is a PD interaction, not a PK/enzyme interaction, and neither drug is a prodrug here.
- Direction: Increased combined QT-prolonging effect and torsades de pointes risk.
- Severity: Contraindicated per label.
- Evidence: Theoretical.
- Onset: Unspecified; consider piperaquine's long half-life for recently used QT drugs.
- Management: Avoid coadministration. If unavoidable, ECG and electrolyte (K+, Mg2+) monitoring per specialist guidance.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Because piperaquine prolongs the QT interval, giving it together with other QT interval prolonging agents, such as antiarrhythmic medications, is contraindicated. The same contraindication applies when a QT interval prolonging drug has been taken recently and, according to its half-life, may still be present in the circulation at the point when piperaquine is given1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Combining these two is flagged as something to avoid because both can affect heart rhythm.
- Keep taking both as prescribed until you have spoken with your prescriber or pharmacist. Do not stop on your own.
- Tell your care team you have been given both so they can decide whether to choose an alternative or space out timing based on how long each drug stays in your body (piperaquine lasts a long time).
- Your team may monitor you more closely, including checking an ECG and blood electrolytes, if any overlap is truly needed.
- Report any fainting, dizziness, or palpitations right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Relugolix and Piperaquine together?
Piperaquine and relugolix both prolong the QT interval, so combining them is generally contraindicated; talk to your doctor or pharmacist before taking both so they can pick a safer option or monitor you closely. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Relugolix and Piperaquine interaction?
It is rated contraindicated. These should generally not be used together.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Relugolix and Piperaquine interaction managed?
Combining these two is flagged as something to avoid because both can affect heart rhythm. Keep taking both as prescribed until you have spoken with your prescriber or pharmacist. Do not stop on your own. Tell your care team you have been given both so they can decide whether to choose an alternative or space out timing based on how long each drug stays in your body (piperaquine lasts a long time)… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Relugolix or Piperaquine need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (1)
- Product Information: Eurartesim oral film-coated tablets, piperaquine tetraphosphate dihydroartemisinin oral film-coated tablets. Sigma-Tau Industrie Farmaceutiche Riunite S.p.A (per EMA), Rome, Italy, 2012.
Keep reading about Piperaquine
Keep reading about Relugolix
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