Can the hair loss treatment cycle be changed?

Hello. Lately, whenever I wash my hair, a huge amount of hair falls into the drain—to the point where it looks pitch black—so I am considering hair loss treatments! I looked up reviews, but since there are so many different types of treatments and management methods and frequency vary from person to person, I don't know what to do. I am especially curious about the frequency; I've heard that treatments are most effective when the scalp condition is constantly monitored. Actually, how often should I receive treatments to maintain the results? Also, is it okay to change the treatment schedule between the beginning and the end? I am also curious how many treatments are typically required to see noticeable results. Furthermore, does changing the treatment cycle significantly reduce effectiveness? I feel a bit burdened if the intervals are too short.