In an early episode of the anime (including the manga chapters) Shinichi/Conan Manages to return to his original Form by drinking some alchohol, there is also a girl he meets called Haibara/Ai, she is the creator of the drug and also a victim, like Azn Leo-Kun said, she helps him find the cure and there is also some scenes when he returns to his original form.
And also, it's not too bad that Ran's father gets credit, that helps both him and ran Including Conan/Shinichi Get more money Since He lives with them, it appears Ran's father wasn't really successful and caused big money problems who prevented a divorce to her parents, this helps both Ran and Conan.
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