What the FDA labels say about taking them together
Ascorbic acid and multiple vitamins
Multiple vitamins's FDA label of November 20, 2024 names ascorbic acid in its drug interactions section; the ascorbic acid label PlainMeds reads does not name multiple vitamins. The multiple vitamins label: “Thiamine, riboflavin, pyridoxine, niacinamide, and ascorbic acid decrease activities of erythromycin, kanamycin, streptomycin, doxycycline, and lincomycin”
Check it at the source: the ascorbic acid FDA label on DailyMed (effective May 29, 2026, McGuff Pharmaceuticals, Inc.); the multiple vitamins FDA label on DailyMed (effective November 20, 2024).
What does the ascorbic acid label say about multiple vitamins?
Ascorbic acid's label (effective May 29, 2026) does not name multiple vitamins in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Ascor), McGuff Pharmaceuticals, Inc., effective May 29, 2026 (SPL set 388aad52-fc01-4784-9791-1dbc80c69306), via openFDA; the full label on DailyMed
What does the multiple vitamins label say about ascorbic acid?
Multiple vitamins label, drug interactionsEffect of INFUVITE PEDIATRIC on other drugs: Thiamine, riboflavin, pyridoxine, niacinamide, and ascorbic acid decrease activities of erythromycin, kanamycin, streptomycin, doxycycline, and lincomycin
Multiple vitamins label, warnings and precautionsAscorbic acid in the urine may cause false negative urine glucose results.
Source: FDA drug label (Infuvite Adult, NDA021163), Sandoz Inc, effective November 6, 2024 (SPL set 14c7bfc5-07e8-400f-b8ff-5e4794dd2805), via openFDA
Source: FDA drug label (Infuvite Pediatric), Sandoz Inc, effective November 20, 2024 (SPL set 6d06546e-8b0a-4490-82d9-397bd902a044), 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
| Ascorbic acid | Multiple vitamins | |
|---|---|---|
| Labeled for | n/a | n/a |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | n/a | 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