For clinicians without a hospital login
UpToDate drug interactions checker access, cost and alternatives
The UpToDate drug interaction checker is excellent and it belongs to whoever pays for the login. If that is no longer your employer, here is what the tool does, what it costs to get back, and what else checks a medication list.
Or run the list here. Prescriber.io checks it against the patient, not just against itself.
Press Run check for the interaction, contraindication, dosing and alternatives on this pair.
Not matched, so not checked: .
Nothing on this pair matched a row in the reference tables behind this check. That is not a clearance: it means these references do not name this combination.
Guideline-based alternatives
That was your demo check, run on the same references the desk uses. The desk adds renal dosing against an estimated clearance, hepatic review, unlimited checks, saved history and your sign-off on every card.
The on-page check covers five prescribing scenarios and never invents clinical output, so it will not produce a card for this pair.
The full Prescriber.io desk checks any regimen against interactions, contraindications, and renal or hepatic dosing, with cited sources for you to verify.
Interaction
Contraindication / allergy check
Dosing guidance (renal / hepatic)
Guideline-based alternatives
Decision support. You verify against official sources and sign.
Clinician in the loopDecision support for licensed clinicians. Prescriber.io does not diagnose or prescribe and is not a substitute for professional clinical judgment.
$24 per clinician a month billed annually. Decision support for licensed US clinicians.
The short answer
Does UpToDate have a drug interaction checker, and what does it cost?
Yes. UpToDate includes a Drug Interactions tool, built on UpToDate Lexidrug (formerly Lexicomp), that analyzes drug-drug, herb-drug and herb-herb combinations and rates each pair from A (no known interaction) to X (avoid combination). It comes as part of UpToDate (the app listing names drug reference and interactions among its features) and is not sold separately. UpToDate publishes no personal price, so the cheapest published route to the same interaction data is the Lexidrug app at $29.99 a month. Prescriber.io is a different kind of check: it screens the list against the patient, with contraindications and renal or hepatic dosing, for $24 per clinician a month billed annually.
Risk ratings in the UpToDate tool
Avoid combination
The risk usually outweighs the benefit. Pick another agent.
Consider therapy modification
Change the dose, the timing or the drug, or add monitoring.
Monitor therapy
Usually fine together with a monitoring plan.
No action needed
An interaction is documented but rarely matters clinically.
No known interaction
Nothing documented between the two.
How the tool works
How to use the UpToDate drug interactions tool
Open UpToDate and click Drug Interactions under the search bar. The same link sits in the menu at the top right of every page. Type each drug or herb to build the list, then click Analyze.
Every interacting pair comes back with a letter. Click a pair and you get the interaction monograph: the rating, a summary of what happens, and patient management advice. You can filter the result by rating and print it for the chart or the patient.
D and X are the ratings that should stop you before you sign. C is the long tail, and on a list of twelve drugs there can be a lot of it. The data underneath is UpToDate Lexidrug, which is why the ratings match what a hospital pharmacist sees in the Lexicomp drug interaction checker.
Strengths and limits
What UpToDate drug interactions cover and where the tool stops
Three things it does better than almost anything else, and three it was never built to do.
Drug, herb and herb pairs
The tool analyzes drug-drug, herb-drug and herb-herb combinations. Add the whole list and it returns every interacting pair it knows about.
A monograph behind every rating
Each pair opens an interaction monograph with the risk rating, a summary and patient management notes. This depth is the reason pharmacists trust it.
Filter and print
You can filter the result by rating and print it, which helps when a long list returns twenty C ratings and one D that matters.
It does not know the patient
You type drug names. Kidney function, liver disease, age and allergies are not part of the analysis, so the same list returns the same result for every patient.
Contraindications live elsewhere
Whether a drug is unsuitable for a condition is in the drug monograph. You look that up separately for each drug on the list.
Access follows the login
Most people who use it never paid for it. Change jobs, graduate or open a practice and the tool goes with the badge.
Same list, different patient
Why a drug-name checker and a patient check give different answers
Take a list most primary care clinicians see weekly: apixaban, metformin, lisinopril, and you are about to add trimethoprim-sulfamethoxazole for a urinary tract infection. Any good interaction checker flags the antibiotic with the ACE inhibitor for hyperkalemia.
Now make the patient 81 with a creatinine clearance of 28. The hyperkalemia risk is no longer a footnote, the antibiotic needs a renal dose adjustment, and metformin is sitting close to the kidney threshold where its labeling says stop. None of that is an interaction between two drug names, so a name-based tool cannot raise it.
That gap is what a patient-aware check closes. Our drug contraindication checker page covers the condition screens, and the renal dosing calculator shows the kidney thresholds.
Drug names only
TMP-SMX + lisinopril
Hyperkalemia risk. Monitor potassium.
List plus patient, 81 y, CrCl 28
TMP-SMX + lisinopril
Hyperkalemia, higher risk with age and reduced kidney function.
TMP-SMX dose
Renal adjustment at CrCl 15 to 30. Source cited.
Metformin
Below eGFR 30 labeling contraindicates. Confirm eGFR.
Illustrative example. You verify each flag against current labeling and sign.
Access and price
UpToDate interaction checker access routes and what each costs
Seven ways a US clinician gets a professional interaction check, with the price each vendor publishes.
| Route | What you get | Published US price | Best for |
|---|---|---|---|
| UpToDate through a hospital or university | The full Drug Interactions tool inside UpToDate, on site or through remote access your library sets up. | Paid by the institution. Access ends when you leave. | Employed clinicians, residents, students |
| UpToDate personal subscription | Clinical topics with drug reference and interaction analysis, on web and in the app. | Not published. The store asks for country, role and a sign-in before any figure. | Clinicians who want the clinical topics as much as the checker |
| UpToDate Lexidrug app | The interaction database that powers the UpToDate tool, with full drug monographs. | $29.99 a month after a one-month trial | Pharmacists and prescribers who want the reference, not the topics |
| Epocrates Interaction Check | Multi-drug check for drugs, herbs and supplements with its own severity categories. | In the free app. epocrates+ is $179.99 a year or $24.99 a month | A fast phone check on a short list |
| Medscape Drug Interaction Checker | Pairwise check rated Contraindicated, Serious, Monitor Closely or Minor. | Free with a Medscape account, ad supported | A second opinion that costs nothing |
| Micromedex Drug Interactions | Severity and documentation ratings across drug, food, lab and other interaction types. | No published price. Sold to institutions. | Hospital pharmacy |
| Prescriber.io | Checks the full medication list against the patient: interactions, contraindications and renal or hepatic dose adjustments in one card, each with a cited source. | $24 per clinician a month billed annually, $49 monthly | Practices and solo prescribers with no institutional login |
Tool details from the UpToDate User Academy; prices from each vendor's own page or the US App Store, read October 2026. Check the vendor before you buy.
Getting the UpToDate checker without a hospital login
Start with what you may still have: a hospital affiliation or a teaching appointment sometimes carries remote UpToDate access, so ask the library before you pay. If nothing applies, a personal subscription brings the tool back along with everything else in UpToDate. Our page on UpToDate subscription cost explains why no figure is published and how the store flow works, and the UpToDate discount guide lists the society rates.
If the checker is the only part you miss, the Lexidrug app is the cleaner purchase. It is the same interaction database with fuller monographs at $29.99 a month, and the Lexidrug subscription page covers the trial and what is in the package. The UpToDate vs Lexicomp comparison sets the two side by side.
Where UpToDate wins
On depth, plainly. The interaction monographs are written and maintained by a large pharmacist editorial team, the herb coverage is real, and the tool sits one click from the clinical topic you were already reading. If your institution pays, use it. A free checker such as the one behind our Medscape drug interaction checker review is a reasonable second opinion, and a patient-aware check earns its place when most of your risk comes from kidneys, age and conditions more than from drug pairs.
How Prescriber.io works
Check a medication list against the patient in four steps
-
1
Paste the medication list
One drug per line, brand or generic, the way it sits in the chart. Add the drug you are about to prescribe.
-
2
Add the patient
Age, sex, weight, serum creatinine and liver function. This is the part a drug-name checker never asks for.
-
3
Read one card
Interactions, contraindications and renal or hepatic dose flags sorted by severity, each with the mechanism and a cited source.
-
4
Verify and sign
You check the flags that matter against current labeling and make the call. The card supports the decision; it does not make it.
It runs in the browser on a phone, tablet or desktop. The drug interaction checker page shows the full card, and the dose side has its own drug dosage calculator app page.
Who pays for a checker
Who ends up buying an interaction checker of their own
Inside a hospital the check is done twice before a dose reaches the patient, once by the EHR and once by a pharmacist with a licensed database. Outside it, the prescriber is often the only check there is.
Clinicians who just left a hospital
UpToDate came with the job. In a private or independent practice the interaction check has to be bought, per clinician.
NPs and PAs in outpatient practice
A lightweight EHR with noisy alerts and no pharmacist down the hall. The check has to be right before the prescription leaves.
Small practices buying for a team
Three to thirty prescribers who need the same check and one invoice, without an enterprise sales cycle.
Telehealth and urgent care
New patient, an incomplete list and ten minutes. Interactions and renal dosing need to arrive in one pass.
Prescriber.io
$24
per clinician a month, billed annually. $49 month to month.
Lexidrug app
$29.99
a month after a one-month trial. Same interaction data as UpToDate.
UpToDate personal
No list price
The store shows a figure only after country, role and sign-in.
Every plan is billed per prescribing clinician. Full detail on the pricing page.
Straight answers
Questions clinicians ask about UpToDate drug interactions
Does UpToDate have a drug interaction checker?
Yes. UpToDate includes a Drug Interactions tool that analyzes drug-drug, herb-drug and herb-herb combinations and rates each pair from A (no known interaction) to X (avoid combination). You open it from the UpToDate homepage under the search bar or from the menu, add the drugs and click Analyze. The interaction data comes from UpToDate Lexidrug, formerly Lexicomp.
Is the UpToDate drug interaction checker free?
No. The Drug Interactions tool sits behind an UpToDate login, so someone pays for it: your hospital, your university or you. UpToDate does not publish a personal subscription price; its store asks for your country and role and then a sign-in. If you only want the interaction database, the UpToDate Lexidrug app costs $29.99 a month after a one-month trial.
How do I use the drug interactions tool in UpToDate?
Open UpToDate, click Drug Interactions under the search bar (or in the menu at the top right), type each drug or herb to build the list, then click Analyze. Each interacting pair appears with its risk rating. Click a pair to read the interaction monograph, which gives a summary and patient management advice. Results can be filtered by rating and printed.
What do the UpToDate interaction ratings A, B, C, D and X mean?
They are Lexidrug risk ratings. A means no known interaction. B means no action needed. C means monitor therapy. D means consider therapy modification. X means avoid the combination. In practice D and X are the two that should stop you before signing, and C deserves a monitoring plan in frail or renally impaired patients.
Is the UpToDate interaction checker the same as Lexicomp?
It uses the same interaction database. Wolters Kluwer owns both products, renamed Lexicomp to UpToDate Lexidrug, and says the same editorial team develops the drug content in each. Lexidrug adds fuller drug monographs and extra modules around the checker; UpToDate wraps it in clinical topics.
Can I get the UpToDate drug interaction checker without a hospital login?
Yes, three ways. Buy a personal UpToDate subscription, whose app listing names drug reference and interactions among its features. Subscribe to the UpToDate Lexidrug app at $29.99 a month for the same interaction data. Or use a different checker: Medscape and the basic Epocrates check are free, and Prescriber.io screens the whole list against the patient for $24 per clinician a month billed annually.
What is the best alternative to the UpToDate drug interaction checker?
It depends on what you lost. For the same ratings and monographs, the Lexidrug app is the direct substitute at $29.99 a month. For a free pairwise check, Medscape works. If you want the list checked against the patient, with contraindications and renal or hepatic dosing in the same result, Prescriber.io does that for $24 per clinician a month billed annually.
Related pages
More on UpToDate, Lexidrug and interaction checking
UpToDate subscription cost
Why no price is published and how to subscribe.
PlansUpToDate Pro Plus
Expert AI, Kidney Dosing and what the higher plan adds.
Buyer's guideLexicomp drug interaction checker
Cost and personal access to Lexi-Interact.
ComparisonUpToDate vs Micromedex
Two institutional references and how their checkers differ.
GuideAI drug interaction checker
Which checker agreed most with pharmacists in published studies.
Buyer's guideEpocrates for nurse practitioners
What the free app covers and when epocrates+ is worth $179.99.
Check the whole list against the patient before you sign
Interactions, contraindications and renal or hepatic dosing in one card, with a cited reason on every flag. You review, verify, and sign.
Decision-support for licensed clinicians. Prescriber.io does not diagnose or prescribe autonomously and is not a substitute for professional clinical judgment. UpToDate, Lexidrug, Lexicomp, Epocrates, Medscape and Micromedex are trademarks of their owners. Prescriber.io is not affiliated with any of them.