Questions & Answers about Dadah menjejaskan kesihatan.
In this sentence, dadah means drugs, usually in the sense of narcotics or illegal/harmful drugs.
It normally does not mean medicine in everyday Malay. For medicine, Malay usually uses ubat.
So:
- dadah = drugs, especially harmful/illegal drugs
- ubat = medicine
Menjejaskan means to negatively affect, to harm, or to impair.
In Dadah menjejaskan kesihatan, it means that drugs have a bad effect on health.
It is a little broader than just destroy. It can mean:
- harm
- damage
- adversely affect
- impair
So the sentence is not saying health is completely ruined, only that it is harmed or affected badly.