spec sheet10 rows
Dronabinol is a pharmaceutical cannabinoid that consists of synthetically produced (-)-trans-delta-9-tetrahydrocannabinol (delta-9-THC), the principal psychoactive constituent of Cannabis sativa, formulated as an oral agent. Marketed as Marinol (sesame-oil capsules) and Syndros (an oral solution), it is approved by the U.S. FDA for chemotherapy-induced nausea and vomiting refractory to conventional antiemetics and for anorexia associated with weight loss in patients with AIDS. It acts as a partial agonist at the CB1 and CB2 cannabinoid receptors of the endocannabinoid system, producing appetite stimulation, antiemetic effects, analgesia, and mood elevation. Dronabinol capsules were rescheduled from Schedule II to the less restrictive Schedule III in the United States, while the Syndros oral solution remains Schedule II.
- Stimulates appetite and helps stabilize weight in AIDS-related anorexia
- Controls chemotherapy-induced nausea and vomiting refractory to standard antiemetics
- Reduces nausea and can improve mood alongside appetite gains
- Provides modest analgesia for certain pain states
- Standardized, single-molecule dosing with FDA labeling and a clinical evidence base
- Psychoactive effects: euphoria, dizziness, and altered or abnormal thinking
- Drowsiness, and sometimes anxiety, paranoia, or confusion at higher doses
- Tachycardia and orthostatic hypotension, especially early in treatment
Overview
Dronabinol is essentially pharmaceutical-grade delta-9-THC in a capsule or oral drop; it is pretty much the cleanest, most standardized way to get the exact same molecule that drives cannabis, minus the smoke and the guesswork on dose. The appetite and anti-nausea data are hands down its strongest suit; the classic AIDS-anorexia trial showed it reliably nudged appetite up and steadied weight, and head-to-head against ondansetron it held its own for delayed chemo nausea.
The appeal is that it is a known quantity with real FDA labeling behind it; you know precisely what you are taking. Just be honest with yourself; it is orally dosed THC, so the psychoactivity, the slow oral onset, and the dizziness are part of the package, and megestrol tends to beat it for raw weight gain in wasting syndromes. For the person who wants the endocannabinoid benefits with a clinical paper trail, it is a solid, above-board option.
Mechanism
Dronabinol is (-)-trans-delta-9-tetrahydrocannabinol, a partial at the two G-protein-coupled cannabinoid receptors. At the CB1 receptor (densely expressed in the , on presynaptic terminals in the , basal ganglia, , and hypothalamic feeding circuits) it couples to Gi/o proteins, inhibiting adenylate cyclase and formation, closing voltage-gated calcium channels and opening inward-rectifying potassium channels; this dampens presynaptic neurotransmitter release and underlies its psychoactive, orexigenic (appetite-stimulating), and analgesic actions.
At the CB2 receptor (predominantly on immune cells) it produces anti-inflammatory and immunomodulatory effects. Antiemetic activity is thought to arise from CB1 agonism in the dorsal vagal complex and area postrema (the brainstem vomiting center) together with modulation of serotonergic 5-HT3 signaling. After oral dosing it is nearly completely absorbed but undergoes extensive hepatic metabolism (mainly CYP2C9 and CYP3A4) to the active 11-hydroxy-THC, giving low and variable oral , a delayed onset, and a long terminal due to storage in adipose tissue.
receptor fingerprint
CB1 receptorPartial agonist
CB2 receptorPartial agonist
Adenylate cyclase / (via Gi/o)Inhibits
5-HT3 receptorNegative allosteric modulator
Safetyrisks and cautions, not medical advice
Dronabinol is a controlled substance and a psychoactive drug; common adverse effects are dose-related and central, including euphoria, dizziness, somnolence, abnormal thinking, and, less often, anxiety, paranoia, or hallucinations. Cardiovascular effects such as tachycardia and orthostatic hypotension can occur, particularly at initiation and in older patients. It should be used cautiously with other CNS depressants and in people with cardiac disease, psychiatric history, or substance-use disorder. In cancer- and HIV-associated wasting, comparative trials found megestrol acetate produced greater weight gain than dronabinol. It is not risk-free, but adverse effects in appetite and antiemetic trials were generally mild to moderate, and discontinuation rates were similar to placebo.
Interactionsdocumented pairs only, not exhaustive
Food significantly affects dronabinol (THC) absorption and plasma concentrations through a pharmacokinetic food-drug interaction. Administration with a fatty meal increases THC area under the curve 1 to 3-fold and delays the peak concentration time approximately 2-2.5 hours [7]. The active metabolite 11-hydroxy-THC similarly increases with food. Additionally, cannabis terpenes naturally present in some cannabis products exhibit pharmacodynamic synergism with THC at cannabinoid CB1 and CB2 receptors; terpenes like limonene, sabinene, and beta-caryophyllene potentiate THC-induced receptor activation above what would be predicted from additive effects alone [8].
The clinical relevance of terpene interactions is variable depending on product formulation and terpene profile. Interactions not extensively studied include dronabinol with specific medications that compete for hepatic metabolism, concurrent use of other CNS depressants beyond general pharmacology descriptions, and long-term polypharmacy patterns in chronic cannabis users.
Checking a whole stack? Run it through interactions + stacks.
Resources
This entry is here for reference.
Research
- 1995first citedDronabinol as a treatment for anorexia associated with weight loss in patients with AIDS
- 2008meta-analysisTherapeutic use of Cannabis sativa on chemotherapy-induced nausea and vomiting among cancer pat…
- 2026most recentSynergistic and additive terpene-THC interactions in cannabinoid CB1 and CB2 receptors.
- 1.Dronabinol as a treatment for anorexia associated with weight loss in patients with AIDS
- 2.Efficacy of dronabinol alone and in combination with ondansetron versus ondansetron alone for delayed chemotherapy-induced nausea and vomiting
- 3.Therapeutic use of Cannabis sativa on chemotherapy-induced nausea and vomiting among cancer patients: systematic review and meta-analysis
- 4.Cannabinoids in palliative care: systematic review and meta-analysis of efficacy, tolerability and safety
- 5.A 4-week pilot study with the cannabinoid receptor agonist dronabinol and its effect on metabolic parameters in a randomized trial
- 6.Delta9-tetrahydrocannabivarin as a marker for the ingestion of marijuana versus Marinol: results of a clinical study
- 7.A phase I study to assess the effect of food on the single dose bioavailability of the THC/CBD oromucosal spray.
- 8.Synergistic and additive terpene-THC interactions in cannabinoid CB1 and CB2 receptors.
8 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
What is dronabinol used for?
It is FDA-approved for chemotherapy-induced nausea and vomiting that has not responded to conventional antiemetics, and for anorexia with weight loss in people with AIDS. It is synthetic delta-9-THC sold as Marinol capsules and Syndros oral solution.
How does dronabinol work?
It is a partial agonist at the CB1 and CB2 cannabinoid receptors. CB1 activation in feeding, brainstem, and pain circuits drives its appetite-stimulating, antiemetic, analgesic, and psychoactive effects, while CB2 activation contributes anti-inflammatory actions.
Is dronabinol well-researched?
Yes. It has randomized controlled trials for AIDS anorexia and chemotherapy nausea, plus systematic reviews and meta-analyses in oncology and palliative care, making it one of the better-studied single-molecule cannabinoids.
How is dronabinol different from cannabis or CBD?
Dronabinol is purified, synthetically made delta-9-THC with standardized dosing and no CBD, terpenes, or minor cannabinoids like THCV that natural cannabis contains. It is taken orally, so onset is slower and more variable than smoked or vaporized cannabis.
What are the main side effects?
The most common are psychoactive: euphoria, dizziness, drowsiness, and abnormal thinking, with occasional anxiety or paranoia. Tachycardia and orthostatic hypotension can occur, especially at the start of treatment.
Adverse effects
- Psychoactive effects: euphoria, dizziness, and altered or abnormal thinking
- Drowsiness, and sometimes anxiety, paranoia, or confusion at higher doses
- Tachycardia and orthostatic hypotension, especially early in treatment
Notes and cautions
- Slow, variable oral onset with unpredictable bioavailability
- Controlled-substance status; Syndros remains Schedule II, capsules Schedule III