What the FDA labels say about taking them together
Mirtazapine and moxifloxacin
Mirtazapine's FDA label of August 6, 2025 names moxifloxacin in its warnings and precautions section; the moxifloxacin labels PlainMeds reads (3) do not name mirtazapine. The mirtazapine label: “Prolongation and Torsades de Pointes The effect of REMERON (mirtazapine) on QTc interval was assessed in a clinical randomized trial with placebo and positive (moxifloxacin) controls involving 54 healthy volunteers …”
Check it at the source: the mirtazapine FDA label on DailyMed (effective August 6, 2025, Organon LLC); the moxifloxacin FDA label on DailyMed (effective March 17, 2026, Macleods Pharmaceuticals Limited).
What does the mirtazapine label say about moxifloxacin?
Mirtazapine label, warnings and precautionsProlongation and Torsades de Pointes The effect of REMERON (mirtazapine) on QTc interval was assessed in a clinical randomized trial with placebo and positive (moxifloxacin) controls involving 54 healthy volunteers using exposure response analysis.
Source: FDA drug label (REMERON), Organon LLC, effective August 6, 2025 (SPL set 98ad1917-a094-44f5-a28f-a64a8cfcd887), via openFDA; the full label on DailyMed
What does the moxifloxacin label say about mirtazapine?
Moxifloxacin's label (effective March 17, 2026) and its 2 other brand-application labels do not name mirtazapine in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Moxifloxacin), Macleods Pharmaceuticals Limited, effective March 17, 2026 (SPL set 182ecd0f-714f-42f0-9b16-fb604cf15786), via openFDA; the full label on DailyMed
These are the labels' own sentences. PlainMeds does not grade interactions; a pharmacist or prescriber can say what they mean for one person's medicines.
Both medicines on the record
| Mirtazapine | Moxifloxacin | |
|---|---|---|
| Labeled for | Depression | Bacterial infections |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | $0.063 per tablet 15 mg tablet | $1.60 per mL 0.5% eye drops |
| Shortage now | No current entry | A presentation being discontinued |
Source: FDA NDC Directory, CMS NADAC of October 7, 2026 and the FDA Drug Shortage Database (FDA files October 8, 2026)
What next?
- Check more medicines together
- up to five at once