Green Vitriol — Safety & Interactions
Zao Fan · Melanteritum
Use with caution. Practitioner review recommended before use.
Contraindications
- Pregnancy
- Active gastritis, peptic ulcer, or severe stomach irritation
- Large unsupervised internal doses
- Use as an ordinary decocted supplement
Cautions
- Internal Zao Fan can cause nausea, abdominal pain, vomiting, constipation, or diarrhea if the dose is excessive or the stomach is weak.
- Traditional practice generally prefers pills, powders, or external use rather than long boiled decoctions.
- Because it is fundamentally an iron salt, modern medication-style absorption issues matter when it is taken internally.
- MSK page not found - drug interaction data not available from Memorial Sloan Kettering integrative medicine database
Drug Interactions
| Drug Class / Substrate | Mechanism | Severity | Source |
|---|---|---|---|
| Tetracycline or fluoroquinolone antibiotics - ferrous iron can reduce drug absorption | |||
| Levothyroxine - ferrous iron can reduce absorption | |||
| Antacids or high-calcium supplements - may reduce iron absorption from internal Zao Fan use | |||
Pregnancy
Not recommended during pregnancy. Consult a qualified practitioner before any use.
This information is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before using herbal medicines, especially if you take prescription medications.