I am 18 years old and I have genetic hair loss from my mom's side. Can I use minoxidil 5% and finastride together? (photo)

I'd recommend switching to organic products for your shampoo and conditioner, and to look in to preventative medications like Finasteride and Minoxidil which has been proven to halt and even reverse hair loss.  PRP would also be an option for you. Before starting any medications it is best to check with your physician.

Your biggest enemy is the progressive
thinning leading to a balding pattern that is not evident at this point in
time. The degree of thinning that you are experiencing would suggest that
you should see a doctor who has a HAIRCHECK instrument and will most likely will get
Bulk Measurements of your hair to determine the degree of the thinning
that you are presently having. If the diagnosis is early genetic hair loss
(the most common cause of hair loss in young men), then the best treatment
would be the drug finasteride which is highly effective in men of your age
and may not only stop the hair loss but possibly reverse it. If you are
developing a more advanced balding pattern the best test to get
will determine the Bulk Measurements of your hair and this will show, over
a one-year time frame, how effective the treatment will be. Once you know
this information, then you and your doctor need to develop a MASTER PLAN
which will define what you need to do over the years to come.