Prescribing API

Building with an AI agent? Copy for LLM (above) puts the entire prescribing-API documentation — endpoint contract, letter format, consent flow, webhooks, pricing — on your clipboard as one prompt you can hand to your agent to build the whole integration.

Add a real, board-certified physician review and e-prescription to your health or wellness app with one API call. Appendix is the medical practice; your app makes the introduction. Think Stripe, but for prescriptions.

How it works

Your app calls POST /api/v1/prescribing/query with the clinical request and the patient's contact info, using your developer API key.
Appendix runs an AI completeness check, then returns a consent_url.
Your patient opens the consent URL — an OAuth-style modal where they review exactly what's being submitted, attest to its accuracy, consent to care with Appendix, and verify their identity (one time).
A board-certified physician reviews the request and prescribes if clinically appropriate. Once the physician approves, the patient receives a text message with a link to choose their pharmacy; the prescription is then transmitted to the pharmacy they choose.

The consent gate

The consent modal is the keystone. It establishes the patient-physician relationship directly with Appendix— your app makes the introduction, structurally similar to "Sign in with Google." Your app never practices medicine and never holds the care relationship. See Consent & Identity.

Test and production keys

Test keys

Instant and self-serve. Exercise the entire integration in a sandbox — completeness gate, consent link, simulated physician decision. Submissions are never seen by a real physician and you are never charged.

Production keys

Issued after the Activate Production workflow (card on file + credits, your own ID verification, and accepted terms) plus a quick manual review. Submissions reach a real physician.

Partner integrations

Build Appendix into your product. Our doctors handle the clinical work; you keep ownership of the user experience.

Who this is for

If you’re building an app, AI agent, or service where your users would benefit from a physician-reviewed letter and a prescription when appropriate, Appendix can plug in. We work with consumer health products, AI assistants, employer and membership benefits, caregiver tools, and specialty-care pathways that need a licensed prescriber on the back end.

What an integration looks like

Your product collects the user’s history and reason for visit, then submits a structured letter to our API.
One of our board-certified physicians personally reviews the submission and writes back with an assessment, guidance, and a prescription if medically appropriate.
Prescriptions route to the pharmacy of the patient’s choice. You can surface status updates inside your app.
Identity verification, clinical record-keeping, and physician licensure are handled by us.

Start without talking to anyone

Issue yourself a test key from the developer dashboard, build against the sandbox, and follow the quickstart. When you’re ready for real patients, request production access from the dashboard.

Volume and white-glove partnerships

Email hello@appendix.com with a short note about what you’re building and your expected volume. A physician on our founding team will write back.