I started to lose my hair after 12 days. Eye brows and lashes stayed almost throughout very treatment. I didn't notice they were falling out bc they were thinning, and started to grow in before all of them fell out. Because I lost both at the end and my hair started coming in , I was only without my lashes and brows for a month or so. I know everyone's different Though-I had 8 treatments. AC then Taxol.