How to Add Drug Interaction Checking to Your Health App in 5 Minutes

Nearly 1 in 4 Americans takes a prescription drug alongside a dietary supplement. That's roughly 75 million people who might not know that their fish oil could be amplifying their blood thinner, or that their St. John's Wort is undermining their antidepressant.

If you're building a health app, a pharmacy tool, or any patient-facing software, drug interaction checking isn't a nice-to-have -- it's table stakes.

The problem is that getting reliable interaction data into your app has historically been painful.

The Problem: Separate Databases, None of Them Talk to Each Other

The US government maintains excellent drug and supplement data. It's authoritative, it's free, and it's scattered across separate systems with different formats:

• 
  openFDA (api.fda.gov) -- drug labels, NDC directory, drug-interaction label sections, adverse events


• 
  RxNorm (rxnav.nlm.nih.gov) -- drug naming and RxCUI identifiers


• 
  NIH ODS (ods.od.nih.gov) -- supplement fact sheets and interactions

Each API has its own conventions, its own data format, and its own quirks. RxNorm uses RxCUI identifiers. openFDA uses NDC codes. NIH supplement data comes in yet another format. To get a complete picture of a drug plus its supplement interactions, you need to cross-reference all of them.

Most teams either spend weeks building and maintaining their own integration layer, or they pay $500+/month for a commercial database license. Neither option is great for a side project, an MVP, or a startup trying to validate an idea.

MedData API: One Endpoint, All the Data

and runs on the actual government data sources -- nothing is generated or inferred. Drug-drug interactions come from FDA structured product labels (openFDA) plus a curated set of major interactions; drug-supplement interactions come from the NIH.

Let me show you how it works.

Quick Start

You'll need an API key. The free tier gives you 250 requests/month, which is enough to test everything out.

1. Go to the
   


2. 
   Interactive docs:
   


3. 
   On RapidAPI: . Data sourced from openFDA, RxNorm, and the NIH Office of Dietary Supplements.
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