Bupropion - Has anyone taking bupropion sr started having a problem with hair thinning/hair loss?

Although all antidepressants (among many other medications) have the potential to cause hair loss bupropion might be more apt to. Still, it's very rare,
Uncommon (0.1% to 1% of users): Alopecia
Talk to your doctor about possibly switching to one with a lower risk such as fluoxetine (Prozac) and paroxetine (Paxil).
BTW, your hair will grow out again after stopping or changing medications.

After a few months of starting Bupropion, which I love, I noticed my hair falling out. After researching the subject of hair loss, Titanium Dioxide was mentioned as possibly causing hair loss, and although it was referring more to sunscreen usage, my pharmacist told me the manufacturer of my 150 Bup. XL listed Titanium Dioxide as an ingredient. My pharmacy was able to change my prescription to a different manufacturer that did not list Titanium Dioxide. My hair loss stopped noticeably. After a few months I wanted to lessen my dosage of Bupropion and unfortunately did not research the ingredients of the only available manufacturer for my reduced dosage. After a few weeks my hair started falling out again, and today I discovered that this manufacturer listed Titanium Dioxide as an ingredient. After reading more about Titanium Dioxide today, it is not only suspect for hair loss but also for cancer. Obviously, I will change manufacturers for my Bupropion. Please look into Titanium Dioxide yourself!

Mostly all the ADs have the potential for hair loss. But, it could be from the combo together of meds that causes hair loss. My hair loss I think is from stress.