Understanding Hair Loss and the Role of DHT
Hair loss, particularly male pattern baldness (androgenetic alopecia), is often linked to the hormone dihydrotestosterone (DHT). DHT can shrink hair follicles, leading to thinner hair and eventual hair loss. Addressing this process is key to slowing or halting hair loss.
How Does Finasteride Work?
Finasteride is a prescription medication that works by blocking the enzyme 5-alpha-reductase. This enzyme converts testosterone into DHT. By lowering DHT levels in the scalp, finasteride helps prevent further hair follicle shrinkage and may allow hair regrowth in some individuals. It is most effective for men with mild to moderate hair loss.
According to NHS, finasteride is typically taken as a daily tablet and may take at least three to six months before noticeable effects are seen. Continuous use is required to maintain benefits.
The Hair Growth Cycle and Finasteride
Hair grows in cycles: anagen (growth), catagen (transition), and telogen (resting). DHT shortens the anagen phase, causing hair to enter the resting phase sooner and fall out. By reducing DHT, finasteride helps prolong the growth phase, supporting thicker, fuller hair over time.
Safety and Considerations
Finasteride is generally well tolerated, but some people may experience side effects such as reduced libido or mood changes. It is not suitable for use in women or children. Always discuss with a healthcare provider before starting treatment. For more information on safety and side effects, see MedlinePlus.
Regulation and Prescription
In the UK, finasteride is a prescription-only medicine regulated by the Medicines and Healthcare products Regulatory Agency (MHRA). It should only be used under the guidance of a licensed clinician.
This content is not a substitute for professional medical advice—consult a licensed clinician.