How long do the effects of hair loss treatment last? I'm curious about honest reviews!

Lately, the area around my part seems to be getting thinner and thinner, and it's really stressing me out...

I bought products that were supposed to be good, tried home care, and even changed my shampoo, but nothing really helped, so I am considering getting treatment at a dermatologist.

I’ve heard people around me say that hair loss treatments have been effective, but I’m curious how long the results last and how long they need to be maintained in practice. I know it varies from person to person, but I would be very grateful if you could share some honest reviews on the extent of the treatment's effectiveness and how many sessions are typically required to see noticeable results.

Since it involves some cost, I would like to make a decision after hearing recommendations or opinions from those who have definitely seen results from hair loss treatments.

Oh, and are there any side effects? I'm also worried about whether it will be painful in many ways.