Part 4: Z-Drugs and Sedatives — Zolpidem, Zopiclone, and Nitrazepam

Clinical Reference for Healthcare Professionals.

---

1. Zolpidem Tartrate

Field	Detail
INN / Salt	Zolpidem Tartrate
Drug Class	Imidazopyridine (Non-Benzodiazepine Hypnotic / "Z-Drug")
Schedule	Schedule H1
Indian Brands	Zolfresh, Stilnox, Ambien, Nitrest
Legitimate Uses	Short-term treatment of insomnia

Mechanism of Action

Zolpidem selectively binds to the alpha-1 subunit of the GABA-A receptor (BZ1 receptor). Unlike benzodiazepines (which bind non-selectively to multiple GABA-A subtypes), Zolpidem's selectivity was designed to produce pure hypnotic (sleep-inducing) effects without significant anxiolytic or muscle relaxant properties.

Why It Is Abused

If the user takes Zolpidem and deliberately fights the urge to sleep, it produces a trance-like, disinhibited, euphoric state with visual distortions and a feeling of detachment from reality. It is also combined with alcohol for an amplified effect.

Side Effects & Dangers of Abuse

• Complex Sleep Behaviors: Sleepwalking, "sleep-driving," sleep-cooking, and sleep-eating while not fully conscious. These behaviors carry an FDA black box warning.
• Amnesia: Complete memory blackout of events during the intoxicated period.
• Dependence: Rapid tolerance development and a withdrawal syndrome similar to benzodiazepines (rebound insomnia, anxiety, seizures).

---

2. Zopiclone

Field	Detail
INN / Salt	Zopiclone
Drug Class	Cyclopyrrolone (Non-Benzodiazepine Hypnotic / "Z-Drug")
Schedule	Schedule H1
Indian Brands	Zopicon, Imovane, Zopifresh
Legitimate Uses	Short-term treatment of insomnia

Mechanism of Action

Zopiclone acts on the same GABA-A benzodiazepine receptor complex but at a different molecular site than classical benzodiazepines. It has a rapid onset and intermediate duration (half-life 5-6 hours).

Why It Is Abused

Similar to Zolpidem, Zopiclone is abused by those who take it and resist sleep. It produces a metallic taste in the mouth (a pharmacological signature) alongside sedation and euphoria. It is frequently combined with alcohol.

Side Effects & Dangers of Abuse

• Metallic/Bitter Taste: A unique and persistent side effect.
• Next-Day Impairment: Hangover effects impair driving and cognitive function.
• Dependence: Though marketed as "less addictive" than benzodiazepines, chronic abuse leads to significant physical dependence.

---

3. Nitrazepam

Field	Detail
INN / Salt	Nitrazepam
Drug Class	7-Nitrobenzodiazepine (Hypnotic)
Schedule	Schedule H1
Indian Brands	Nitravet, Nitrosun, Mogadon
Legitimate Uses	Insomnia (short-term), myoclonic seizures in infants

Mechanism of Action

Nitrazepam is a classical benzodiazepine hypnotic. It enhances GABA-A activity with a prolonged half-life (15-38 hours), making it highly sedating.

Why It Is Abused

Nitrazepam is one of the oldest and most well-known sedatives. It is abused for its powerful, long-lasting sedation. In polysubstance abuse, it is combined with alcohol or opioids for an amplified CNS depression.

Side Effects & Dangers of Abuse

• Extreme Oversedation: Due to its long half-life, the patient may remain impaired for 24+ hours.
• Falls in the Elderly: Beers Criteria explicitly warns against its use in older adults.
• Teratogenicity: Risk of birth defects if taken during pregnancy.

---

Next: Part 5: Gabapentinoids — Pregabalin and Gabapentin