What the FDA labels say about medicines together
Interaction checker
Enter two to five medicines. The checker reads each one's FDA label for the others and quotes what it says, both ways, from 7,576 pairs that the labels of 1,333 medicines name (FDA labels, October 8, 2026). It does not grade interactions, and a label that says nothing about another medicine does not make the two safe together.
What the labels say
No medicine named “polyethylene-glycol-3350-potassium-chloride-sodium-bicarbonate-sodium-chloride-s” is on PlainMeds. Did you mean Polyethylene glycol 3350, potassium chloride and 3 other ingredients?
Enter at least two medicines to read their labels for each other.
How the checker reads the labels
For each pair, the checker looks for one medicine's name in the other's drug interactions, contraindications, warnings and boxed warning sections, and quotes the sentence that names it. Brand and generic names count as the same medicine; where a medicine's quoted label is an over-the-counter Drug Facts label, its prescription label is read too. A label lists the interactions its studies and reports found; it is not a complete list.
What a sentence means for one person's medicines is a question for a pharmacist or prescriber. PlainMeds does not give medical advice.
Source: FDA drug labels (drug interactions, contraindications, warnings, boxed warnings) via openFDA, read October 8, 2026
What next?
- Understanding drug interactions
- what labels list and why
- Drug interactions in the labels
- the medicines other labels name most
- Compare two medicines
- labels, generics and prices side by side