Methaqualone was banned because it causes strong sedation, high addiction and dependence risk, and can produce fatal respiratory depression—especially when combined with alcohol or other depressants. Widespread recreational misuse and overdose deaths in the 1960s–70s showed its low therapeutic value versus hazards. Public-health concerns led to strict regulation and eventual prohibition in most countries.

Yes. Methaqualone is the generic chemical compound; Quaalude was a popular brand name for methaqualone (also marketed as Mandrax in some regions). Introduced as a sedative–hypnotic in the 1960s, it became widely abused for its euphoric and sedating effects. Because of dependence, overdose risk, and misuse, methaqualone/Quaalude was withdrawn or made illegal in many countries.

Methaqualone (Quaalude) is a historically used sedative‑hypnotic. Drugs with similar effects include barbiturates (e.g., phenobarbital), benzodiazepines (diazepam, lorazepam), non‑benzodiazepine "Z‑drugs" (zolpidem, zopiclone), and central nervous system depressants like GHB. These agents depress brain activity, causing sedation, sleepiness, and respiratory depression; they carry risks of dependence, overdose, and dangerous interactions with alcohol and opioids.

The Wolf of Wall Street prominently depicts Quaaludes (methaqualone), a sedative‑hypnotic once prescribed for insomnia and anxiety. Quaaludes cause heavy sedation, impaired coordination and respiratory depression, and carry high risks of dependence and overdose—reasons they were withdrawn or tightly controlled in many countries. The film also shows stimulant use (cocaine), but Quaaludes are its signature drug.

Methaqualone is a central nervous system depressant formerly prescribed as a sedative‑hypnotic to treat insomnia and related sleep disorders, and sometimes used for anxiety and muscle relaxation. It produces pronounced sedation, relaxation and euphoria, which led to widespread recreational use, dependence and overdose risk. Due to abuse and safety concerns it is now tightly controlled or withdrawn in most countries.

Schedule I drugs are substances designated by many governments as having high abuse potential, no accepted medical use, and the strictest legal controls. Common examples include heroin, LSD, MDMA (ecstasy), psilocybin (magic mushrooms), methaqualone and, in some places, cannabis. Possession, production or supply is typically illegal and can lead to heavy fines and imprisonment.