Hydrates, Solvates, and Water Activity: Managing Moisture-Driven Solid-Form Change in Small-Molecule APIs
You don’t usually see moisture-driven solid-form change coming. A batch looks fine at release. The XRPD pattern matches, residual solvents pass, and water by Karl Fischer is low. Then a week later, after milling, after a liner change, after a stability pull… your API behaves differently. Flow shifts. Compaction changes. Dissolution surprises you. The uncomfortable […]

