What the FDA labels say about taking them together
Castor oil and valrubicin
Valrubicin's FDA label of October 31, 2024 names castor oil in its contraindications section; the castor oil label PlainMeds reads does not name valrubicin. The valrubicin label: “CONTRAINDICATIONS VALSTAR is contraindicated in patients with: Perforated bladder [ see Warnings and Precautions] Known hypersensitivity to anthracyclines or polyoxyl castor oil Active urinary tract infection Small …”
Check it at the source: the castor oil FDA label on DailyMed (effective June 15, 2026); the valrubicin FDA label on DailyMed (effective October 31, 2024, Endo USA, Inc.).
What does the castor oil label say about valrubicin?
Castor oil's label (effective June 15, 2026) does not name valrubicin 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 valrubicin label say about castor oil?
Valrubicin label, contraindicationsCONTRAINDICATIONS VALSTAR is contraindicated in patients with: Perforated bladder [ see Warnings and Precautions ( 5.2 )] Known hypersensitivity to anthracyclines or polyoxyl castor oil Active urinary tract infection Small bladder capacity and unable to tolerate a 75 mL instillation Perforated bladder or compromised bladder mucosa ( 4 , 5.2 ) Hypersensitivity to anthracyclines or polyoxyl castor oil. ( 4 ) Concurrent urinary tract infections. ( 4 ) Patients with a small bladder capacity unable to tolerate a 75 mL instillation.
Source: FDA drug label (Valstar), Endo USA, Inc., effective October 31, 2024 (SPL set e96f30a0-6662-11de-8f80-0002a5d5c51b), 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 | Valrubicin | |
|---|---|---|
| Labeled for | Constipation | n/a |
| Boxed warning | No | No |
| 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