For your question about continuing Finax (finasteride 1mg) for hair growth over 4 months, here are the key points to consider:

1. Effectiveness Timeline:
   Finasteride typically requires at least 3 to 6 months of consistent use before noticeable hair growth or slowing of hair loss occurs.

2. Safety:
   For a 41-year-old male, finasteride is generally considered safe when taken as prescribed. Monitor for side effects such as decreased libido, erectile dysfunction, or mood changes.

3. Consultation:
   Continue the medication under the guidance of a healthcare provider who can assess your response and any side effects.

4. Duration:
   Many patients use finasteride long-term to maintain hair growth benefits, but stopping the medication usually results in reversal of effects within months.

If you have any concerns or experience side effects, discussing them with your doctor is important to ensure safe and effective treatment.