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Pronunciation

droe-NAB-i-nol

Classifications

Therapeutic Classification: antiemetics

Pharmacologic Classification: cannabinoids

Indications

REMS


Action

  • Active ingredient in marijuana.
  • Has a wide variety of CNS effects, including inhibition of the vomiting control mechanism in the medulla oblongata.
Therapeutic effects:
  • Suppression of nausea and vomiting.
  • Increased appetite in patients with AIDS.

Pharmacokinetics

Absorption: Extensively metabolized following absorption, resulting in poor bioavailability (10–20%).

Distribution: Highly lipid-soluble. Persists in tissues for prolonged period of time.

Protein Binding: 97%.

Metabolism/Excretion: Primarily metabolized in the liver via the CYP2C9 isoenzyme with some metabolism by the CYP3A4 isoenzyme; the CYP2C9 isoenzyme exhibits genetic polymorphism; poor metabolizers may have significantly dronabinol concentrations and an risk of adverse effects; 50% excreted via biliary elimination. At least one metabolite is psychoactive.

Half-Life: 25–36 hr.

Time/Action Profile

(antiemetic effect)

ROUTEONSETPEAKDURATION
POunknown2–4 hr4–6 hr



Appetite stimulation lasts 24 hr or longer.

Contraind./Precautions

Contraindicated in:

Use Cautiously in:

Adv. Reactions/Side Effects

CV: hypertension, hypotension, palpitations, syncope, tachycardia

Derm: facial flushing

EENT: dry mouth

GI: abdominal pain, nausea, vomiting

Neuro: anxiety, concentration difficulty, confusion, dizziness, drowsiness, mood change, abnormal thinking, amnesia, ataxia, depression, disorientation, euphoria, hallucinations, headache, impaired judgment, paranoia, paresthesia, SEIZURES

Misc: physical dependence, psychological dependence (high doses or prolonged therapy)

Interactions

Drug-drug:

Drug-Natural Products:

Route/Dosage

Nausea and Vomiting Associated with Cancer Chemotherapy

Anorexia Associated with Weight Loss in AIDS

Availability

(Generic available)

Assessment

Implementation

Patient/Family Teaching

Evaluation/Desired Outcomes

US Brand Names

Marinol, Syndros

Contr. Subst. Schedule

Schedule II (C-II)oral solution
Schedule III (C-III)capsules

Code

NDC Code