There are hair loss products, such as Propecia, that are effective. Unfortunately the side effects can be severe: low testosterone, loss of libido, infertility, erectile dysfunction.
Anyone considering hair loss medication should do some concerted research.
Anybody considering Propecia should SERIOUSLY consider the consequences. Losing your hair, especially as a young man, might be stressful. But consider the possible alternative of never again being able to achieve an erection. Multiple case studies have indicated that Propecia can cause indefinite sexual dysfunction, even after you quit taking the drug. The anecdotal evidence online is much worse.
So tread carefully. The set of women who are sexually attracted to bald men is much, much larger than the set of women who are sexually attracted to men who are unable to have sex.
Just try out Rogaine/Regaine (whatever it's called there). The active ingredients are minoxidil and cutane.
They're off-the-counter products, but you still might want to talk to your doctor about it, not because there are any significant side effects, but because it's a good habit.
There's a drug on the market that's taken by patients who had prostate cancer. It grows back your hair and is being bought off - label for it.
I forgot the name.
Anyone considering hair loss medication should do some concerted research.