Synthetic Cannabinoids: What is Their Purpose?

Nabilone and dronabinol are prescription cannabinoid medicines with specific approved uses. Their manufactured formulations provide a known amount of active ingredient, but their effects still vary between patients. They can cause intoxication and serious adverse effects, so standardized dosing should not be confused with guaranteed relief or freedom from risk.

What Are Nabilone and Dronabinol?

The FDA identifies Marinol, Syndros, and Cesamet as approved synthetic cannabis-related medicines. Dronabinol is delta-9 THC, whereas nabilone is a distinct synthetic compound with a chemical structure similar to THC. Nabilone is not simply another formulation of the same molecule.

These drugs also differ from unregulated products sold as “Spice” or “K2,” which are discussed below. The term “synthetic cannabinoid” is too broad to establish a product’s identity, purpose, or safety by itself.

Nabilone: Cesamet

The Cesamet prescribing information specifies chemotherapy-associated nausea and vomiting when conventional antiemetic treatment has not worked adequately. It is not intended as the first antiemetic prescribed or for casual, as-needed use. The label calls for close supervision, especially when treatment begins or doses change.

Nabilone can cause drowsiness, dizziness, anxiety, disorientation, hallucinations, and changes in heart rate or blood pressure. Psychiatric adverse reactions may persist for 48 to 72 hours after stopping. Patients are instructed not to drive or perform hazardous activities during treatment. Its chemotherapy indication does not establish approval for chronic pain, fibromyalgia, or AIDS-related appetite loss.

Dronabinol: Marinol and Syndros

Marinol capsules and Syndros oral solution have adult indications for appetite loss associated with weight loss in patients with AIDS and for chemotherapy-associated nausea and vomiting after an inadequate response to conventional antiemetics. These are specific indications, not approval for every cause of poor appetite or nausea.

Dronabinol can impair thinking and physical performance, worsen some psychiatric symptoms, cause changes in blood pressure or heart rate, and increase seizure risk. Paradoxically, worsening nausea, vomiting, or abdominal pain can occur during treatment and should be reported to the prescriber. Older patients may be particularly sensitive to adverse effects.

What Standardized Formulations Offer

A prescription product provides a defined active ingredient and strength, manufacturing controls, and prescribing information. Those features help a clinician select and monitor treatment. They do not ensure identical effects across doses or patients: the formulation, food, other medicines, and individual response still matter.

A liquid may be useful for someone who has difficulty swallowing capsules, but changing administration methods requires formulation-specific instructions. Do not substitute a retail THC product or convert a capsule prescription into a volume of solution yourself.

Syndros contains alcohol and propylene glycol. Its label includes contraindications involving disulfiram and metronidazole and specific timing restrictions around those medicines. A pharmacist should review the full medication list and explain how to measure and take the prescribed solution. The existence of a liquid formulation does not establish that it corrects malabsorption.

Approved Uses and Research Uses Are Different

Researchers also study cannabinoids for other conditions. A randomized trial of dronabinol for agitation in Alzheimer’s disease has been published, advancing the research discussed in our Alzheimer’s agitation article. Publication of a trial does not add that condition to the drug’s FDA-approved indications.

When considering a use outside the label, discuss the strength of evidence, alternatives, monitoring, and stopping criteria with the treating clinician. A known chemical dose alone is not a reason to assume that long-term treatment is appropriate.

Prescription Medicines Are Different from K2 and Spice

CDC surveillance of synthetic-cannabinoid poisonings documented serious neurological and other toxicity associated with unregulated products, including agitation, delirium, seizures, and deaths. Such products are not substitutes for prescribed nabilone or dronabinol. Their contents cannot be inferred from a street name or the word “herbal.”

For prescription treatment, ask which symptom is being targeted, why this medicine was chosen, which interactions matter, and how benefit and adverse effects will be assessed. Tell the prescriber about alcohol, other cannabis products, sedating medicines, and relevant psychiatric or seizure history. Follow the product’s driving restrictions and medication instructions.