What the FDA labels say about taking them together
Cromolyn and isoproterenol
Cromolyn's FDA label (Gastrocrom) of June 26, 2024 names isoproterenol in its drug interactions section; the isoproterenol label PlainMeds reads does not name cromolyn. The cromolyn label: “Isoproterenol alone increased both resorptions and major malformations (primarily cleft palate) at a subcutaneous dose of 2.7 mg/kg.”
Check it at the source: the cromolyn FDA label on DailyMed (effective February 20, 2025, Sandoz Inc); the isoproterenol FDA label on DailyMed (effective December 16, 2025, Eugia US LLC).
What does the cromolyn label say about isoproterenol?
Gastrocrom label (Viatris Specialty LLC, June 26, 2024), drug interactionsIsoproterenol alone increased both resorptions and major malformations (primarily cleft palate) at a subcutaneous dose of 2.7 mg/kg (approximately 7 times the maximum recommended daily inhalation dose in adults on a mg/m 2 basis).
Source: FDA drug label (Gastrocrom, NDA020479), Viatris Specialty LLC, effective June 26, 2024 (SPL set 00623958-a8fe-47d1-a0d2-0aa4e2f7966e), via openFDA
Source: FDA drug label (Cromolyn Sodium), Sandoz Inc, effective February 20, 2025 (SPL set b32851c3-cd97-4be4-a09c-1deab1d6966b), via openFDA; the full label on DailyMed
What does the isoproterenol label say about cromolyn?
Isoproterenol's label (effective December 16, 2025) does not name cromolyn in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Isoproterenol Hydrochloride), Eugia US LLC, effective December 16, 2025 (SPL set 3e4050e8-7d94-4ed7-951d-1ff818ddadf1), 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
| Cromolyn | Isoproterenol | |
|---|---|---|
| Labeled for | Asthma, Allergies | n/a |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | $0.349 per mL 100 mg/5 mL oral conc | n/a |
| Shortage now | Listed; available | 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