6. MDMA

This drug is commonly known as ecstasy and is used to trigger recreational euphoria. If you consume it in excess or together with alcohol or SSRIs, MDMA becomes dangerous to the body and may lead to cases of serotonin syndrome, coma, shock, or death. 

5. Methamphetamine

Methamphetamine is also known as crystal meth. This drug is used as a stimulant, and it’s only used for recreational purposes with no medical benefit behind it.

The worst-case scenario when consuming methamphetamine is death. Other possible side effects of consuming this drug are accidental overdose, severe brain damage, and tooth loss.

4. Methotrexate

The common types of this deadly drug are Rasuvo, Trexall, and Otrexup, used to treat psoriasis, cancer, and rheumatoid arthritis. Consuming this drug in excess or combination with probenecid makes it very deadly, resulting in kidney, lung, liver damage and possible death.