Prodipine
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| Other names | BY-101; 1-Isopropyl-4,4-diphenylpiperidine | 
| Routes of administration | Oral, intravenous injection | 
| Drug class | Antiparkinsonian agents | 
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| Formula | C20H25N | 
| Molar mass | 279.427 g·mol−1 | 
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Prodipine (INN; developmental code name BY-101) is an experimental antiparkinsonian agent of the 4,4-diphenylpiperidine series related to budipine which was never marketed. It was the predecessor of budipine and was similarly found to be effective in the treatment of Parkinson's disease. However, prodipine produced side effects including gastrointestinal adverse effects, nausea and vomiting, and hypotension. Due to the nausea and vomiting with the oral form, it could only be tolerated with intravenous administration. As a result, budipine, which had fewer side effects, was developed instead.