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Check interactions between medicines.

Enter the names of your medicines and check whether they may interact. Free tool powered by the DDInter 2.0 database.

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DDInter 2.0 · 300k+
Medicine 1
Medicine 2
This tool is for informational purposes only and does not replace advice from a doctor or pharmacist. Always consult a healthcare professional before changing your treatment. The DDInter 2.0 database may not cover all possible interactions.

What are drug interactions?

A drug interaction occurs when two or more medicines affect each other, altering the way one of them works. This can lead to increased side effects, reduced efficacy, or new symptoms. It is estimated that drug interactions account for 6–30% of all adverse drug events.

Severity levels

Severe
The combination may pose a health risk. Requires immediate medical consultation.
Moderate
The combination requires caution. May require dose adjustment or monitoring.
Low
Interaction of minor clinical significance. Worth being aware of, but usually does not require intervention.

What is an ATC code?

The ATC (Anatomical Therapeutic Chemical) code is an international drug classification system developed by the WHO. Each medicine has a unique 7-character code, e.g. N02BE01 stands for paracetamol. You can find the ATC code on the medicine package, in the patient leaflet, or on national drug registry websites.

Data source

Our tool uses the DDInter 2.0 database — one of the largest publicly available drug interaction databases, containing over 300,000 known interactions. It is regularly updated based on published clinical and pharmacological research.

Page last updated: . Sources: DDInter 2.0; WHO ATC classification. Results are informational and do not replace consultation with a doctor or pharmacist.

Frequently asked questions

Type the names of your medicines in the fields above, select them from the suggestions, and click "Check interactions". No account is needed — the tool is completely free and publicly available.
We use the DDInter 2.0 database, which is one of the largest publicly available databases of interactions between active substances. It contains over 300,000 known interactions and is regularly updated based on published clinical studies.
No — this is an informational tool that helps you preliminarily assess the risk of combining medicines. If a serious interaction is detected, always consult a doctor or pharmacist. The tool does not take into account your individual health situation, allergies, or dosage.
Create a free account in mojApteczka and add your medicines. The system will automatically check interactions between all medicines and sort results by severity — from serious to informational. No need to enter ATC codes manually.
Check interactions automatically in mojApteczka
Add your medicines to your kit and the system will automatically detect potential interactions. No ATC codes needed — just scan the package.
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