Switching from Mylan to Northstar finasteride tablets

[thisisme]

I started using Propecia at age 19, but then switched to the generic version of finasteride at age 20, which were tablets produced by a drug company named Mylan. I used the Mylan tablets until this past December (age 23), and they had been working very well. However, I ran out of Mylan and the local pharmacy had begun carrying Northstar brand finasteride tablets. So for all of January I've been using the Northstar tablets and have noticed my hair thinning quite a bit. Is my body just trying to adapt to the new tablets? They're also 5mg of finasteride and appear to be the same except for the northstar tablets seem to be less "powdery."

It could be that my hair has been thinning a bit anyway and switching tablets has caused me to be more attentive to my hair. Unsure. Appreciate any insight! I'm going to give it another few months anyway before I really worry but just was curious if anyone had ideas.

One last thing to mention is male pattern baldness does occur in my family so I'm doing the best to mitigate it.