I will be using Minoxidil for a short time, but will my hair fall start again once I discontinue use?

They say i won't have to use minoxidal for very long. I have heard that your hairfall if you stop using minoxidal? I am a female of 20 years. I have been having hairfall for the last 3 years. The hair texture has become thin as well as my hair density. Now after 3 years of having all my tests clear doctos have come to conclusion that may be due to swimming I used to do three years back.i was a chronic swimmer. But I won't always wash my hair after swimming neither would I take the necessory precautions.they have prescribed minoxidal. Doctors say that I won't need to use minoxidal for long and I can quit it