What the FDA labels say about taking them together
Castor oil and paclitaxel
Paclitaxel's FDA label of January 21, 2026 names castor oil in its contraindications section; the castor oil label PlainMeds reads does not name paclitaxel. The paclitaxel label: “CONTRAINDICATIONS Paclitaxel Injection, USP is contraindicated in patients who have a history of hypersensitivity reactions to paclitaxel or other drugs formulated in Polyoxyl 35 Castor Oil, NF.”
Check it at the source: the castor oil FDA label on DailyMed (effective June 15, 2026); the paclitaxel FDA label on DailyMed (effective January 21, 2026, Natco Pharma USA LLC).
What does the castor oil label say about paclitaxel?
Castor oil's label (effective June 15, 2026) does not name paclitaxel in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Signature Care), Better Living Brands, LLC, effective June 15, 2026 (SPL set 4947cf4d-3ebd-4b66-9582-f141407aa300), via openFDA; the full label on DailyMed
What does the paclitaxel label say about castor oil?
Paclitaxel label, contraindicationsCONTRAINDICATIONS Paclitaxel Injection, USP is contraindicated in patients who have a history of hypersensitivity reactions to paclitaxel or other drugs formulated in Polyoxyl 35 Castor Oil, NF.
Source: FDA drug label (Paclitaxel), Natco Pharma USA LLC, effective January 21, 2026 (SPL set a1eb16b4-285b-4e81-9c4e-1244d4a52af8), 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
| Castor oil | Paclitaxel | |
|---|---|---|
| Labeled for | Constipation | Breast cancer, Lung cancer |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $0.0193 per mL Castor oil | n/a |
| Shortage now | No current entry | No current entry |
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