Minoxidil works by opening potassium channels, leading to reduced blood pressure and potential side effects like reflex tachycardia. It is used for hair growth and affects blood pressure at high doses.
The user experienced stable hairline but diffuse thinning after switching from oral finasteride to a topical solution of minoxidil and finasteride. They are concerned about the effectiveness of the topical treatment and are considering other options due to a recent decline in hair density.