Filaminast
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| Formula | C15H20N2O4 |
| Molar mass | 292.335 g·mol−1 |
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Filaminast (code name WAY-PDA 641) was a drug candidate developed by Wyeth-Ayerst. It is a phosphodiesterase 4 inhibitor (PDE4 inhibitor) and an analog of rolipram, which served as a prototype molecule for several development efforts. It was discontinued after a Phase II trial showed that its therapeutic window was too narrow; it could not be dosed high enough without causing significant side effects (nausea and vomiting), which was a problem with the rolipram class of molecules.