I agree with the idea of bodily autonomy. Above all, someone should have the right to do, or not do, whatever they want with their own person.

Whether that is to listen to doctors advice, buy pharmaceuticals and self-administer as prescribed, or even end your own life, and everything in between.

Quick disclaimer, suicide should still be evaluated by a psychiatric professional, and simply being suicidal shouldn't necessarily mean that nobody can, or should stop you from committing that act. I'm mostly referring to medically assisted self termination, after the appropriate safeguards, checks, and balances have been cleared. Simply wanting to off yourself without being cleared as having sound mind should be something we, as a society, should address carefully, with the assistance of mental health professionals.

With all that being said: I probably would DIY some pharmaceuticals. Anything that's an opiate or other restricted substance, definitely not. But if I can buy the ingredients without needing a special permit or license, I definitely would.