It is no coincidence that the pattern of balding closely parallels the density of DHT receptors in the scalp. Hormonal levels in men with androgenetic alopecia are normal. In women with signs of virilization like beard growth, abnormal periods, or deepening voice, selected hormone studies may be abnormal. If there is inflammation or scarring of the scalp, a skin biopsy can be performed to rule out other rare causes of hair loss. If stopped, reversal to the pretreatment state occurs within three months.
Local irritation can be a side-effect.
Pregnant women should not use minoxidil. This medication is an androgen inhibitor, taken orally. Because of its hormonal action, it cannot be used by women. It takes many plugs over many sessions to simulate a natural pattern. It can be quite expensive.