Have drugs caused hair loss?

I've noticed my hair shedding more than usual and my hair seems weirdly thinner. Im only 21 so this is a little freaky for me. I'm not sure if it has to do with the drugs im on or just genetics. My mom and dad have had hair loss. I'm on lamictal, remeron, and adderall to manage my bipolar disorder. I hear that you'd have to be on a drug for a few months for hair loss to start so it may not be the adderall. I'm more so upset bc this combination has given me great results. I was on gabapentin and I stopped bc I thought that was what was making my hair fall out faster than usual but it's started back up. Any advice? I also smoke weed very frequently I read somewhere that it can do that too lol
Have drugs caused hair loss?
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