---
title: "Eton Secures U.S. IMPAVIDO Rights; $4.25M Fees, Up To $4M Milestones And 50-55% Revenue Share"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/286966420.md"
description: "Eton Pharmaceuticals has secured exclusive U.S. commercialization rights for IMPAVIDO, agreeing to pay $4.25 million in fixed fees and up to $4 million in sales milestones. Eton will share 55% of annual net sales up to $7 million and 50% above that. The agreement, effective from September 26, 2026, includes a term until March 31, 2032, with potential renewals. Symphony Health projects 2025 U.S. sales of $8.1 million."
datetime: "2026-05-19T20:53:01.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/286966420.md)
  - [en](https://longbridge.com/en/news/286966420.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/286966420.md)
---

# Eton Secures U.S. IMPAVIDO Rights; $4.25M Fees, Up To $4M Milestones And 50-55% Revenue Share

Eton Pharmaceuticals entered into an exclusive U.S. supply and distribution agreement for the commercialization rights to IMPAVIDO (miltefosine). Eton will pay $4.25 million in fixed fees through March 31, 2032, plus up to $4.0 million in sales milestones, and will remit 55% of annual net sales up to $7.0 million and 50% above that. The Supplier will cover product and regulatory costs while Eton funds sales and marketing; exclusivity begins September 26, 2026. Symphony Health reported 2025 U.S. sales of $8.1 million.

**Agreement details:**

-   **Agreement type**: Exclusive U.S. commercialization supply and distribution agreement for IMPAVIDO
-   **Counterparty**: Knight Therapeutics (affiliate)
-   **Signed / Effective**: May 18 2026 / Sep 26 2026
-   **Duration / Termination**: Initial term to Mar 31 2032; up to ten 1-year renewals
-   **Reason**: Expand orphan drug portfolio with exclusive U.S. rights to IMPAVIDO

Original SEC Filing: Eton Pharmaceuticals, Inc. \[ ETON \] - 8-K - May. 19, 2026

**Disclaimer**

This is an AI-powered summary. It may contain inaccuracies. Consider verifying important information with the source. Please note this summary is solely based on documents filed with the SEC.

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