WarfarinWisely

1. About The Application

What is WarfarinWisely?

WarfarinWisely is a Clinical Decision Support (CDS) tool designed to assist licensed healthcare professionals in calculating modified weekly warfarin doses based on INR (International Normalized Ratio) test results. The app simplifies calculations using validated clinical guidelines from the Pharmaceutical Services Programme, Ministry of Health Malaysia (Anticoagulant Quick Guide, 1st Edition).

This tool is NOT a medical device, NOT medical advice, and NOT a substitute for professional clinical judgment. Healthcare professionals must independently verify all calculated results before clinical application.

Calculation Methods

The app offers three evidence-based adjustment methods for calculating modified warfarin doses:

• Method A (ICSI Guideline): Percentage-based adjustment (wadj = 15 × INR difference)
• Method B (MOH Malaysia Guideline): Alternative percentage-based adjustment (wadj = 10 × INR difference)
• Method C (Manual/Custom): Custom adjustment defined by the healthcare professional (±15%)

Modified dose is calculated as: mcurD = curD × (100% ± wadj) and mapped to validated daily dose schedules.

Key Features

• Real-time Dose Calculation: Calculates modified weekly warfarin doses based on INR test results
• Input Validation: Validates dose range (3.0–102.0 mg weekly) and INR range (0.1–10.0)
• Multiple Daily Schedules: Generates complete 7-day dose schedules for calculated weekly doses
• PDF Reports: Export calculation results with timestamp and optional clinician signature for medical records
• Secure Sharing: Share results to messaging apps for healthcare provider collaboration
• Offline Operation: Works completely offline—no internet required, no data collection

2. Medical Disclaimer

This WarfarinWisely application is intended as a Clinical Decision Support (CDS) tool for healthcare professionals only. By accessing and using this application, you acknowledge and agree to the following:

What This App IS

• A calculation tool to assist healthcare professionals in modifying warfarin weekly doses based on INR results
• Based on validated pharmaceutical guidelines from the Malaysian Ministry of Health (Anticoagulant Quick Guide, 1st Edition)
• A resource for supporting—not replacing—professional clinical judgment and expertise

What This App IS NOT

• Not a medical device: This app is not classified, registered, approved, or certified as a medical device in any jurisdiction
• Not medical advice: This app does not provide medical advice, diagnosis, or treatment recommendations
• Not a substitute for professional judgment: Healthcare professionals must independently verify and validate all calculated results before clinical application
• Not for patient self-management: Patients must not use this app. Use by patients for self-adjusting anticoagulation therapy is explicitly prohibited

Professional Responsibility

• Healthcare professionals using this app remain fully responsible for all clinical decisions made
• All calculated doses must be independently verified before prescription or administration
• Healthcare professionals must consider the patient's complete clinical picture (comorbidities, drug interactions, bleeding risk, clinical status)
• Laboratory monitoring must continue as per established anticoagulation protocols

Liability Disclaimer

The developer of this application assumes no liability for:

• Any adverse outcomes, complications, or harm resulting from use or misuse of the calculated results
• Errors or inaccuracies in calculations
• Injuries or damages to patients or third parties

3. Privacy Policy

Last Updated: February 2026

TL;DR: What We Don't Do

Data We Do NOT Collect

Patient Information: The app stores zero patient data. You provide input values (INR, current dose) temporarily for calculation, but these are not saved, logged, or transmitted anywhere.

Usage Analytics: We do not track how often you use the app, which features you access, or how long sessions last. No analytics libraries are included.

Location/Identifiers: We do not access your location, device identifiers, or other personal information.

Data We DO Store Locally (On Your Device Only)

The app stores only these user preferences locally on your device using Android SharedPreferences / iOS Keychain:

• Haptic Feedback Toggle — Whether vibration feedback is enabled (default: on)
• Dark Mode Toggle — Whether dark theme is enabled (default: off)
• Signature Text — Optional text you enter for PDF report signatures (defaults to empty)

These preferences are stored only on your device. They are never sent to any server. Uninstalling the app deletes all stored data immediately.

Calculation Data

All dose calculations happen entirely on your device. Calculations are not saved to device storage, sent to any server, or shared with third parties.

Offline Operation

This app requires no internet connection to use. All calculations run locally on your device.

4. Regulatory Positioning

Why This Is NOT a Medical Device

This app is positioned as Clinical Decision Support (CDS) software, not a medical device. Understanding this distinction is important for healthcare professionals and regulators.

• No Diagnosis: The app does not diagnose any medical condition. You, the healthcare professional, provide the diagnosis and INR value.
• No Treatment Recommendation: The app calculates a adjusted dose; it does not recommend starting, stopping, or treating any condition. The clinician determines whether to apply the result.
• No Patient-Directed Advice: The app is not intended for patients. Results are reviewed and interpreted by the clinician, who bears full clinical responsibility.
• Supported Decision, Not Autonomous Decision: The app assists an existing clinical workflow (verification of dose calculations) but does not make autonomous clinical decisions.

Evidence Base

The calculation is based on:

• Pharmaceutical Services Programme, Ministry of Health Malaysia (MOH) — Anticoagulant Quick Guide (1st Edition)
• Peer-reviewed clinical literature supporting ICSI and MOH Malaysia dosing methods
• Validated warfarin dosing tables used in clinical practice