Finasteride is a common oral medication prescribed to treat male pattern baldness. Many individuals who begin this treatment may observe an initial, temporary increase in hair shedding. This is often called a “shedding phase” and is a known aspect of the medication’s action.
Understanding the Initial Shedding Phase
Hair naturally progresses through a cycle that includes growth (anagen), regression (catagen), rest (telogen), and shedding (exogen) phases. In male pattern baldness, a hormone called dihydrotestosterone (DHT) causes hair follicles to miniaturize, shortening their growth phase and leading to thinner, weaker hairs. Finasteride works by inhibiting an enzyme called 5-alpha reductase, which converts testosterone into DHT. By reducing DHT levels, finasteride helps reverse this miniaturization.
When DHT levels decrease, affected hair follicles are encouraged to shift from a resting or regressing state back into a new, healthier growth cycle. This transition often involves the premature shedding of older, weaker hairs to make way for the new, stronger hairs that finasteride is promoting. The shedding phase is a physiological response, indicating the medication is actively working to reset the hair growth cycle. It is not a sign of worsening hair loss, but an expected part of hair follicle revitalization.
Duration and Significance of Shedding
The shedding phase typically begins a few weeks to a few months after starting finasteride, commonly observed around two to three months into treatment. While the exact duration varies among individuals, this increased shedding usually lasts for several weeks, often resolving within two to six months. Some individuals might experience noticeable shedding for up to four weeks within the first few months.
The shedding phase is a positive indication that the medication is effective. It signifies that finasteride is successfully influencing the hair growth cycle, pushing out older, miniaturized hairs to allow for the emergence of new, healthier strands. After this initial period, many users begin to notice improved hair density and reduced hair loss.
Coping with the Shedding Period
Patience and consistency with finasteride treatment are important, though experiencing increased hair shedding can be unsettling. Results from finasteride typically become visible over several months, with significant improvements often noted after six to twelve months of consistent use. Stopping the medication prematurely due to shedding can interrupt the beneficial effects and may cause any gained hair to be lost.
Maintaining a healthy lifestyle, including a balanced diet, can support overall hair health during this period. It is a temporary and normal part of the treatment process. If shedding seems unusually severe, persists beyond the typical timeline (e.g., more than six months), or if other concerning symptoms develop, consulting a healthcare professional is advisable.