How to Use the Drug Interaction Checker
The RxTools Pro Drug Interaction Checker is designed to deliver the most comprehensive free drug interaction analysis available online. Here is a complete guide to using it effectively and interpreting your results.
Adding Medications
Type any medication name - brand or generic - in the input field. Our autocomplete database covers 500+ commonly prescribed and dispensed drugs. As you type, matching suggestions appear in a dropdown. Press Enter or select from the dropdown to add the drug as a tag. Use the Quick Add chips for the most frequently checked medications. Click the × on any drug tag to remove it before running the check. You can add up to 20 medications per check.
Reading Your Results
After clicking Check Interactions, every possible pairwise combination in your medication list is analysed simultaneously. Results are displayed as individual interaction cards, sorted from most to least severe. Each card shows the drug pair, the severity classification, the clinical effect (what happens to the patient), the pharmacological mechanism (why it happens), and the management recommendation (what to do about it). Use the severity filter buttons to focus on specific risk levels.
Severity Classifications
Contraindicated - this combination must never be used. Major - high risk requiring immediate clinical attention, dose adjustment or an alternative. Moderate - requires monitoring and prescriber awareness. Minor - low risk but may cause additive effects or modest efficacy reduction.
Exporting Results
After your check, the export bar below the results allows you to download a PDF report formatted for sharing with your doctor or pharmacist, export raw interaction data as a CSV file with UTF-8 BOM for full Excel compatibility, or print directly using your browser. All export features are completely free with no account required.
Clinical Limitations
This tool checks for known, documented drug–drug interactions based on established clinical databases. It does not account for individual patient factors including CYP450 genetic polymorphisms, specific doses and formulations, duration of concurrent therapy, severity of hepatic or renal impairment, or the full clinical context of the patient's condition. Always consult a licensed pharmacist or physician before making any change to a medication regimen.