It really depends on the drug and who gave it to you.

When a doctor gives you medication against high blood pressure its to keep you healthy.

When the guy from the gym gives you testosterone that he got from his friend its a very bad idea.

If its a drug you can buy yourself at the store, like caffeine, it really depends on the dosage cause you can get caffeine poisoning.

Regarding stuff like weed or LSD or similar. They shouldn’t be taken regularly because they can be mentally addictive and might further psychological issues or get you over the edge faster regarding psychosis.

And for harder drugs like Heroin, Meth… No. Just no.