The interactions tool is accessed via the blue tool bar at the top of the screen. Lexi-Interact is a drug and herbal interaction analysis tool that is designed to identify potential drug-drug interactions, drug-allergy interactions, and duplicate therapy interactions. Begin by entering the list of medications and known drug allergies to be analyzed. The interactions tool allows users to enter medications (both prescription and over-the-counter), natural products, foods and/or alcohol.
Allergies may be entered by medication name (e.g., aspirin) or by the pharmacologic class (e.g., salicylates).
To enter an item, begin typing a keyword into the "Search Drugs" and/or "Search Allergies" box. After you enter at least four (4) characters, suggested terms will populate, and you can select the desired term from the list. If multiple products match your search term, a list of products will appear. To add that medication to the medication list, simply click the "Add" button. Continue this process until all items are added. To remove an item from the list, uncheck the selected box next to the product you wish to remove.
Once the list is complete, click the "Analyze" button to perform an analysis. The Duplicate Drug Therapy feature is automatically checked to provide information about selected medications that are considered duplicate therapies because they belong to the same pharmacologic class.
If you do not want the duplicate therapy screening to be performed, the box can be unchecked prior to selecting the "Analyze" button.
The "Interaction Analysis" screen provides a summary of interactions organized by drug-drug, drug-allergy, and duplicate therapy sections. The summary statements include the search terms used, along with the corresponding generic name(s), if applicable. An assigned risk rating (A, B, C, D or X) appears next to each drug-drug and drug-allergy interaction. Each letter represents a different level of urgency in responding to the identified interactions. The risk rating scale appears on the Interaction Analysis screen and is defined in more detail on the following page.
You can filter the interactions that are displayed on the Interaction Analysis screen by using the available drop- down menus. You may filter by drugs or allergies entered and/or by various risk ratings. To remove the filters selected, simply click the "Reset Filters" button to return to the full, unfiltered interaction analysis results. In addition to the risk rating scale, dependencies associated with a particular drug interaction will also be listed.
Dependencies & Risk Rating Scale
Dependencies (if applicable): Identifies various factors that may influence the occurrence or severity of the interaction. The factors may involve patient-specific variables, such as organ dysfunction (e.g., renal/hepatic), smoking status, genotype (e.g., VKORC1 haplotype), or phenotype (e.g., CYP2D6 poor metabolizer). Additional factors may relate to specific pharmaceutical dosage forms, routes of administration and/or specific dosing regimens. The presence of one or more factors may result in an increased risk and/or severity of interaction, or conversely, disqualify an interaction. Highlighting this information at the top of the monograph helps the clinician evaluate the interaction relevance for a specific patient.
Risk Rating: Provides an indicator to help a clinician quickly decide how to respond to the interaction data. Each drug-drug interaction is assigned a risk rating of A, B, C, D, or X. The progression from A to X shows, as a general matter, an increasing urgency associated with the data. In general, A and B monographs are of more academic than clinical concern. Monographs rated C, D, or X indicate situations that will likely demand a clinician?s attention. The text of the "Patient Management" section of the monographs will provide assistance regarding responses that may be generally useful for many patients. Each drug-allergy interaction is assigned a risk rating of X. The definition of each risk rating is as follows:
|A||No Known Interaction||Data have not demonstrated either pharmacodynamic or pharmacokinetic interactions between the specified agents.|
|B||No Action Needed||Data demonstrate that the specified agents may interact with each other, but there is little to no evidence of clinical concern resulting from their concomitant use.|
|C||Monitor Therapy||Data demonstrate that the specified agents may interact with each other in a clinically significant manner. The benefits of concomitant use of these two medications usually outweigh the risks. An appropriate monitoring plan should be implemented to identify potential negative effects. Dosage adjustments of one or both agents may be needed in a minority of patients.|
|D||Consider Therapy Modification||Data demonstrate that the two medications may interact with each other in a clinically significant manner. A patient-specific assessment must be conducted to determine whether the benefits of concomitant therapy outweigh the risks. Specific actions must be taken in order to realize the benefits and/or minimize the toxicity resulting from concomitant use of the agents. These actions may include aggressive monitoring, empiric dosage changes, or choosing alternative agents.|
|X||Avoid Combination||Data demonstrate that the specified agents may interact with each other in a clinically significant manner. The risks associated with concomitant use of these agents usually outweigh the benefits. These agents are generally considered contraindicated.|
To view more detail about a particular drug-drug interaction, click on a hyperlinked term to review information on:
- Patient management
- Interacting members, class exceptions
- Fully referenced discussion of the available literature
To view more detail about a particular drug-allergy interaction, click on a hyperlinked term to review information on:
- Reactions reported as well as other relevant information for the clinician
- Fully referenced discussion of the available literature
To return to the Interaction Analysis summary page, click on the "Interaction Analysis" tab at the top of the content panel. To return to the initial search screen to enter an additional item, click on the "Drugs" tab at the top of the content panel.
The "Clear" button will clear all items from the list and allow the user to start a new regimen.
- The Lexicomp Online Home Page
- Browse by Category
- Reviewing Search Results
- Accessing Information Within a Drug Monograph
- Accessing Clinical Tools
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