What kind of interaction is it?

Synergy: a documented combination effect that is stronger or more useful than either substance taken alone.

Is this interaction backed by published research?

Yes. NutriStack lists 2 citation rows for the Citalopram + Magnesium Citrate pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Interaction databaseSupplement × PrescriptionReviewed May 2026

Citalopram and Magnesium Citrate, a synergy.

Q: Can I take Citalopram and Magnesium Citrate together?

Yes. The combination of Citalopram and Magnesium Citrate produces a measurable benefit. Citalopram produces dose-dependent QT interval prolongation and carries a black-box warning at doses above 40 mg/day (or 20 mg in older adults). Hypomagnesemia is an independent QT prolongation risk and amplifies citalopram's cardiac effect. Maintaining adequate magnesium intake helps protect against torsades de pointes in this setting.

Q: How does this affect a NutriStack Stack Score?

+2 to your Stack Score per scored synergy row.

Citalopram produces dose-dependent QT interval prolongation and carries a black-box warning at doses above 40 mg/day (or 20 mg in older adults). Hypomagnesemia is an independent QT prolongation risk and amplifies citalopram's cardiac effect. Maintaining adequate magnesium intake helps protect against torsades de pointes in this setting.

2 primary source citations. Moderate evidence. Last verified May 30, 2026.

Open the interaction checker →Read the methodology

One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.

Sourcing standards·Evidence tiers

From the interaction database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.

At a glance

Substances: Citalopram and Magnesium Citrate
Pair type: Synergy
Evidence (highest tier): Moderate
Source citations: 2 sources
Stack Score effect: +2 to your Stack Score (per scored synergy row).
Scope: Supplement × Prescription
Last verified: May 30, 2026

Synergy · Moderate evidence

Synergy

What is happening. Citalopram produces dose-dependent QT interval prolongation and carries a black-box warning at doses above 40 mg/day (or 20 mg in older adults). Hypomagnesemia is an independent QT prolongation risk and amplifies citalopram's cardiac effect. Maintaining adequate magnesium intake helps protect against torsades de pointes in this setting.

Mechanism. Citalopram and its metabolite didesmethylcitalopram block the cardiac hERG/IKr potassium channel, prolonging QT in a dose-dependent way. Hypomagnesemia destabilizes the same repolarization current; adequate magnesium supports normal repolarization and reduces torsades risk.

Recommendation. If you take citalopram, ensure adequate magnesium intake from diet or a modest supplement (200-350 mg/day supplemental elemental magnesium from magnesium citrate is typical). Avoid letting magnesium fall low, particularly if you also take a diuretic or PPI that depletes magnesium.

Sources (2)

Stack Score

How this pair moves the number.

Effect on the composite score

If both Citalopram and Magnesium Citrate are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).

The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.

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