Barbiturates

Barbiturates are central nervous system depressants including long acting phenobarbital and barbital (veronal); intermediate acting amobarbital, butabarbital; and short acting pentobarbital, secobarbital, thiopental (thiopentone) and methohexital. They’ve been used as sedatives, hypnotics, anticonvulsants and anesthetic agents, but many have been largely replaced by safer benzodiazepines due to dependence and overdose risk. Common examples also include butalbital and mephobarbital.

Most modern prescription sleeping pills are not barbiturates. Barbiturates were used historically but are now rarely prescribed because they carry high risks of overdose and dependence. Current options include benzodiazepines, non‑benzodiazepine "Z‑drugs" (zolpidem, zopiclone), melatonin receptor agonists, and orexin antagonists; over‑the‑counter antihistamines and melatonin also differ from barbiturates.

Thiopental (thiopentone) is generally regarded as the most potent barbiturate. It’s an ultra‑short‑acting intravenous anesthetic with very rapid onset and strong central nervous system depressant effects, historically used for induction of anesthesia and to lower raised intracranial pressure. Methohexital and other ultra‑short barbiturates are also highly potent, but thiopental is classically cited as the strongest.

No — Xanax (alprazolam) is not a barbiturate; it’s a benzodiazepine. Both drug classes enhance GABA activity but act at different receptor sites and have different safety profiles. Benzodiazepines are generally safer with lower overdose risk when used alone, but they can cause sedation, dependence, and potentially life‑threatening respiratory depression if combined with alcohol or opioids.

Barbiturates appear in older sedative‑hypnotic and anticonvulsant drugs such as phenobarbital (used for seizures), thiopental (IV anesthetic), pentobarbital, secobarbital, and amobarbital. A commonly encountered compound is butalbital, found in combination headache medicines (often paired with acetaminophen or aspirin and caffeine). Because of dependence and overdose risks, barbiturate use is now limited and closely regulated.

No—aspirin is not a barbiturate. It’s an NSAID (a salicylate) that reduces inflammation, pain, fever, and inhibits platelet aggregation. Barbiturates are central nervous system depressants used mainly for sedation, anesthesia, or seizure control. Aspirin’s risks include gastrointestinal bleeding, ulcers, and Reye’s syndrome in children after viral infections; avoid with certain anticoagulants or aspirin allergy.