Has anyone noticed hair loss or lack of regrowth with dogs {or humans!} taking Gabapentin/neurontin?

Teddy has some issues with his coat, he is neutered now so I expected him to have a fuller coat, instead his coat has actually changed over the last few years, he doesn't seem to have much regrowth where it has been cut previously and where his harness rubbed. He's jsut had a hair sample checked and they didn't find anything. He has some flaky skin and a slight smell.

He is on a good diet and supplemented with Viacutan so I don't think it's dietary.

I am now on Gabapentin too and notice hair loss myself - not "clumps" fortunately, just lots of hair coming out, so it made me wonder if there is a connection?