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To answer your question directly, you may have a case, but it would be against your doctor, not the maker of propecia, since your doctor is responsible for informing you of potential side effects.
The question here would be two things:
1) did your doctor inform you of the potential side effects
2) what your damages may be.
You have a duty to mitigate any harm, so you would have a duty to keep the doctor informed about the ED you are experiencing with the medication. So, there may be a window where your damages are legitimate, but at a point, you will bear some legal responsibility for not informing your doctor.