While GastroPlus is a valuable tool for pharmaceutical development, obtaining and using the software through unauthorized means (like a "crack") is not advisable due to the associated legal and security risks. It's recommended to acquire software through legitimate channels, such as directly from the vendor or authorized resellers, to ensure compliance with software licensing agreements and to receive necessary support and updates.

By integrating in vitro and preclinical in vivo data, GastroPlus helps scientists select optimal doses for first-in-human trials, reducing the risk of failure and ensuring safety margins are maintained.