Finasteride and RU side effects varies for each person. I took Finasteride and had side effect immediately, such as feeling a lump on the left side of my chest, a type of brain fog(I never believed in brain fog before, but that stuff is real and really scary), limp dick, and shrunken balls. My uncles however took finasteride and claim they suffered no side effects, or so they say. I have diffuse thinning with a nw2 hairline, so I honestly believe finasteride was helping make my hair thicker in a quick time. It seemed like Finasteride was working wonders for my hair, but the sides I suffered were too much, and I discontinued. After I discontinued, all the side effects went away within 3 weeks. RU gave me blurred vision and chest pain after 5 days of use, so I brushed it off and continued to use it. However, after about 2 weeks, each time I used RU, I noticed blurred vision and slight chest pain on the left side of my chest, so I discontinued RU. I mixed RU with neogenic.