amobarbital

BEERS REMS

Preoperative sedative and in other situations in which sedation may be required.
Hypnotic for short-term treatment of insomnia.

Unlabeled Use:

Psychiatric interviews.
Wada testing (intracarotid administration to determine hemispheric locus of language dominance prior to epilepsy surgery).

Contraind./Precautions ⬆ ⬇

Contraindicated in:

Hypersensitivity;
Dyspnea or airway obstruction;
Comatose patients;
Pre-existing CNS depression;
Severe hepatic dysfunction;
Porphyria;
OB: Not recommended.

Use Cautiously in:

History of suicide attempts or substance abuse ;
Debilitated patients (use smaller doses);
Patients using alcohol or drugs that cause CNS depression;
Patients with hepatic or renal impairment (dose should be reduced);
Acute or chronic pain (paradoxical excitement may occur);
Hypoadrenalism (↓ effects of corticosteroids);
Pedi: Safety not established in children <6 yr;
Geri: Appears on Beers list. Geriatric patients are at increased risk for excitement, confusion, CNS depression; use smaller doses).

Adv. Reactions/Side Effects ⬆ ⬇

Neuro: drowsiness, abnormal thinking, agitation, ataxia, CNS depression, confusion, dizziness, headache, nightmares, vertigo

Resp: BRONCHOSPASM (IV ONLY), LARYNGOSPASM (IV ONLY), apnea, respiratory depression

CV: bradycardia, hypotension, syncope

GI: constipation, nausea, vomiting

Derm: ANGIOEDEMA, exfoliative dermatitis, purpura, rash

Local: pain or sterile abscess at IM site, phlebitis at IV site

MS: hyperkinesia

Misc: STEVENS-JOHNSON SYNDROMEHYPERSENSITIVITY REACTIONS INCLUDING , fever

Interactions ⬆ ⬇

Drug-drug:

Additive CNS depression with other CNS depressants including alcohol, antidepressants, antihistamines, opioid analgesics, and other sedative/hypnotics.
Sedation may be prolonged with MAO inhibitors and valproic acid.
Induces hepatic enzymes that metabolize other drugs, decreasing their effectiveness, including hormonal contraceptives,furosemide, disopyramide, propafenone, methadone, cimetidine, cyclosporine, tacrolimus, rifampin, estrogen, chloramphenicol, acebutolol, propranolol, metoprolol, timolol, doxycycline, corticosteroids, tricyclic antidepressants, warfarin, theophylline, and quinidine.

Drug-Natural Products:

Concomitant use of kava, valerian, skullcap, chamomile, or hops can ↑ CNS depression.
St. John's wort may ↓ barbiturate effect.

Availability ⬆ ⬇

(Generic available)

Injection: 500-mg vials

Route/Dosage ⬆ ⬇

IM IV (Adults ): Sedative—30–50 mg 2–3 times daily; hypnotic—65–200 mg at bedtime.
IV (Adults ): Psychiatric interviews (unlabeled use)50–100 mg/min for total dose of 200–1000 mg or until patient experiences drowsiness, impaired attention, slurred speech, or nystagmus.
IA (Adults ): Wada test (unlabeled use)100 mg over 4–5 sec via percutaneous transfemoral catheter.
IM IV (Children 6–12 yr): Sedative–65–500 mg (3–5 mg/kg), depending on response.
IM (Children ≥6 yr): Hypnotic—2–3 mg/kg/dose.

US Brand Names ⬆ ⬇

Action ⬆ ⬇

Produces all levels of CNS depression:
- Depresses sensory cortex,
- Decreases motor activity,
- Alters cerebral function.
Inhibits transmission in the CNS and raises seizure threshold.

Therapeutic effects:

Hypnosis.
Sedation.

Classifications ⬆ ⬇

Therapeutic Classification: sedative/hypnotics

Pharmacologic Classification: barbiturates

Pharmacokinetics ⬆ ⬇

Absorption: Well absorbed after IM administration.

Distribution: Rapidly and widely distributed; concentrates in brain, liver, and kidneys. Readily crosses placenta; small amounts enter breast milk. Moderately bound to plasma proteins.

Metabolism/Excretion: Mostly metabolized by the liver.

Half-Life: 16–40 hr.

Contr. Subst. Schedule ⬆ ⬇

Time/Action Profile ⬆ ⬇

(sedation)

ROUTE	ONSET	PEAK	DURATION
IM	30–45 min	rapid	6–8 hr
IV	several min	rapid	6–8 hr

Patient/Family Teaching ⬆ ⬇

Discuss the importance of preparing environment for sleep (dark room, quiet, avoidance of nicotine and caffeine).
May cause daytime drowsiness. Caution patient to avoid driving and other activities requiring alertness until response to medication is known.
Advise patient to make position changes slowly to minimize orthostatic hypotension.
Caution patients to avoid taking alcohol or other CNS depressants concurrently with this medication.
Advise patient to use a nonhormonal method of contraception while taking amobarbital and to notify health care professional promptly if pregnancy is planned or suspected.
Instruct patient to contact health care professional immediately if sore throat, fever, mouth sores, unusual bleeding or bruising, or petechiae occur.

Pronunciation ⬆ ⬇

Code ⬆

NDC Code

0187- Bausch Health US LLC
- 0187-4303- Amytal Sodium
  - 0187-4303-05- 5 mL in 1 VIAL, GLASS (0187-4303-05)

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Indications ⬇