-medications can cause depression
-teens with ADD/ADHD sometimes have situational depression due to being made fun of at a younger age.
-If caused by meds it can get worse if situational few weeks with a counselor should clear it up.

for suicide thoughts i do not think it can be blamed on ADD/ADHD itself but medications could be blamed but depression can cause thoughts of suicide and reverse

hello and welcome. my future son in law has adhd and we have been through a terrible time with him. with councelling and support you can change things around as he has stopped self harming, and drinking and his behaviour has improved.
i think years ago when it was not so well known it gave the impression of bad behaviour being acceptable and this then became a stigma on sufferers.
medication and lots of support has helped him and one to one support through therapists.
unfortunately it doesn,t cure it but i am understanding more about this health problem now.
do feel free to post here and talk to someone thats why we are here and let us support you when you feel any urge to harm yourself.
wish i found this site months ago and through it now i am a supporter on it.
welcome to the site that we have all found comfort in.