Hi, 28 year old, lack of hair on crown

[25 going on 65]

mnx,

To answer your other question, DHT suppressants fight hair loss no matter what stage you're in. You don't need to wait for the condition to progress. Generally, the earlier you start a regimen, the more effective it will be.
But if you want to hold off on medication until you see a hair loss specialist, there's nothing wrong with that.

chris is right that there is a risk of side effects from finasteride. These often resolve themselves while continuing to take the medication, but not always.
Most people tolerate this medicine well, but if you're not one of them, his advice on lowering your dosage will probably be very useful.

StressedToTheBald should generally be ignored. He has been hijacking every active thread with alarmist propaganda about finasteride, while pushing unproven treatments. He also doesn't seem to know how to evaluate scientific studies.
This may sound harsh, but many others on this forum would say the same. You'll notice it too if you stick around long enough.