TLDR Finasteride might cause rare blood clot in brain for baldness patients.
A 30-year-old man developed cerebral venous thrombosis (CVT) during treatment with finasteride for male pattern baldness. He presented with vomiting, blurred vision, and severe headache, and was found to have thrombosis in multiple sinuses. Finasteride was considered a risk factor for CVT, and the man was treated with anticoagulation and showed improvement. This case report suggests that finasteride may be a rare drug to cause CVT in patients with alopecia.
5 citations
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March 2014 in “Indian Journal of Dermatology”
January 2013 in “e-Jurnal Medika Udayana” 
12 citations
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July 2004 in “PubMed” Finasteride, especially in a 1mg dose, effectively slows hair loss and improves hair growth in Japanese men with male pattern hair loss.
38 citations
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June 2003 in “Journal of Investigative Dermatology Symposium Proceedings” Finasteride effectively improves hair growth and slows hair loss in men with male pattern baldness.
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