Yes, be very careful not to accidentally dose yourself continuously during days-long sleep deprivation torture in a CIA mind control experiment. You might break something!

Actually, there's some literature on it being used to cure schizophrenia, autism, depression, mania, etc.

If you abuse it, or mix it with something else, you can hurt yourself for sure.

you can harm yourself with just about anything if you don't take appropriate care, yes.