The document outlines various prohibited drugs in Singapore including opium, morphine, heroin, cannabis, methamphetamine, MDMA, ketamine, yaba, inhalants, and depressants. For each drug, it lists common street names, health effects of use and withdrawal, and legal penalties for possession, consumption, and trafficking. Trafficking amounts over specified thresholds for certain drugs like opium, morphine, heroin, cannabis, and methamphetamine are punishable by death. Possession and consumption of any drug mentioned may result in fines of up to $20,000 and/or 10 years imprisonment.