I think it may depend on the med that is being taken. Some require you to have blood taken to check the toxicity level, which can effect the internal organs it it goes too high. Others may have some effects that aren't proven as actual effects. I know that I never even had a headache in my life until I was put on anti-depressants. Then it was terrible, & couldn't live with the migraine pain. Of course, I don't know if my body would have started having migraines anyway at that point, but it was quite a coincidence. Of course, I abused the meds quite often & ended up at toxic levels because of that. I don't know what permanent effect that abuse had. I might have caused what was only a side effect to be something long term, cause the migraines never went away even though I quit taking any psych meds. I never liked the way I felt while on any of the psych meds so couldn't justify taking them.

This is just my experience. Welcome to the forums. Hope we can help answer some of your questions. I take it by your name, you are into singing with a fairly low voice. I got my AA in music in 1973 as a flute player. Didn't go on from there in music cause couldn't bring myself to become a teacher, so continued it on as my hobby. Welcome again.
Debbie