Frequently Asked Questions

ClearRx is a free, browser-based drug interaction checker built and reviewed by a licensed pharmacist. It lets you look up potential interactions between medications and understand them in plain English, without clinical jargon or information overload.

You enter the medications you are currently taking or considering, and ClearRx cross-references each pair against a curated database of known pharmacokinetic and pharmacodynamic interactions. Results are categorized by severity and include a plain-language explanation of the mechanism behind each interaction.

Yes, ClearRx is completely free to use. There are no premium tiers, hidden fees, or paywalls. The site is supported by non-intrusive advertising, and every feature is available to every visitor at no cost.

No. All interaction checks run entirely within your browser. Your medication list is never transmitted to our servers or any third party. When you close the tab, your data is gone. We have no database of user searches.

Every interaction explanation on ClearRx is written or reviewed by Jay, a licensed pharmacist and senior pharmaceutical researcher specializing in CYP450-mediated drug interactions. The information is cross-checked against peer-reviewed clinical references and prescribing labels.

ClearRx uses four severity levels. Serious means the combination can cause life-threatening effects or is contraindicated. Moderate means the interaction may require dose adjustment or close monitoring. Minor means the interaction is unlikely to be clinically significant for most patients. None means no known interaction exists between the two drugs.

ClearRx references the same primary literature and FDA labeling data that clinical databases use. However, no tool catches every possible interaction, and individual patient factors such as genetics, organ function, and dosing can change risk significantly. ClearRx is a screening tool, not a replacement for a full clinical review.

Yes. The database includes common over-the-counter medications, supplements, and herbal products such as ibuprofen, acetaminophen, St. John’s Wort, and many others. OTC drugs can cause clinically significant interactions just like prescription medications, so checking them is important.

Do not stop or change any medication on your own. Contact your prescribing physician or pharmacist and share the specific interaction ClearRx identified. They can evaluate whether the combination is appropriate for your individual situation or suggest a safer alternative.

No. ClearRx is an educational screening tool, not a substitute for professional medical advice. A pharmacist considers your full medical history, lab values, dosing, and individual risk factors in a way that no automated checker can. Use ClearRx to prepare better questions for your healthcare provider.

The Interaction Map is a visual grid that shows every pairwise combination of the medications you entered. Each cell is color-coded by severity: red for serious, amber for moderate, green for minor, and gray for no known interaction. Click or tap any cell to see the full explanation of that specific interaction.

CYP450 enzymes are a family of proteins in your liver responsible for metabolizing most medications. When two drugs compete for the same enzyme, or when one drug inhibits or induces an enzyme that another drug depends on, blood levels can rise or fall unpredictably. This is the mechanism behind the majority of pharmacokinetic drug interactions.

The database is reviewed and updated on a regular basis as new FDA safety communications, drug approvals, and peer-reviewed studies are published. Major interaction alerts from the FDA are incorporated as soon as they are verified. Each entry includes a reference date so you can see when it was last reviewed.

Yes. ClearRx is designed to facilitate conversations with your healthcare provider. You can print the results page or take a screenshot of the Interaction Map and severity details to bring to your next appointment. Having this information ready helps your doctor make more informed decisions about your care.

NSAIDs (nonsteroidal anti-inflammatory drugs) like ibuprofen and naproxen interact with many common medications, including blood thinners, blood pressure medications, and other pain relievers. They also carry risks of GI bleeding and kidney damage, especially with long-term use. Check our NSAIDs safety guide in the Learn section for a detailed breakdown of risks and safer alternatives.

Yes, significantly. Some antibiotics lose effectiveness when taken with dairy or calcium supplements. Grapefruit juice can increase blood levels of certain medications to dangerous levels. Even the timing of meals relative to medication doses matters. Our Learn section includes detailed guides on antibiotic-food interactions and medication timing.

Currently, ClearRx is available in English only. Drug names, interaction descriptions, and clinical explanations are all provided in English. We are exploring the possibility of adding additional languages in the future, but accuracy and pharmacist review must come first.