Purported Benefits, Side Effects & More


Purported Benefits, Side Effects & More
Cannabis leaf

Common Names

  • Marijuana
  • Ganja
  • Bhang
  • Weed
  • Pot
  • Grass
  • Dope
  • Reefer
  • Hash
  • (>1000 other terms)

For Patients & Caregivers

Tell your healthcare providers about any dietary supplements you’re taking, such as herbs, vitamins, minerals, and natural or home remedies. This will help them manage your care and keep you safe.

What is it?

Cannabis, also known as marijuana, is used to treat some symptoms related to cancer. It’s made from the flowers, leaves, and resin (sticky chemical) of the Cannabis sativa plant.

Cannabis comes in many forms, including vape pens, pills, lozenges, oils, teas, and powder. It isn’t a prescription medication. It can be taken orally (by mouth), by smoking, or by vaporizing.

A licensed doctor or advanced practice provider (APP) must certify you if you want to buy medical marijuana from a registered dispensing facility (a place where medical marijuana is sold).

What are the potential uses and benefits?

Cannabis is used to:

  • Reduce pain
  • Treat glaucoma (eye disease that causes vision loss and blindness)
  • Treat nausea (feeling like you’re going to throw up) and vomiting (throwing up) due to cancer treatments
  • Treat sleep disorders
  • Treat epilepsy (a brain disorder that causes people to have seizures)
  • Treat multiple sclerosis (disease that can cause problems with vision, balance, and muscle control)
  • Treat mood disorders such as depression, bipolar disorder, and seasonal affective disorder
  • Increase appetite

Cannabis also has other uses that haven’t been studied by doctors to see if they work.

Talk with your healthcare providers before taking cannabis. It can interact with some medications and affect how they work. For more information, read the “What else do I need to know?” section below.

What are the side effects?

Side effects of taking cannabis products may include:

  • Drowsiness (feeling sleepy)
  • Restlessness (feeling like you can’t relax or get comfortable)
  • Anxiety (strong feelings of worry or fear)
  • Paranoia (intense thoughts or feelings that someone might try to harm you)
  • Hallucinations (seeing or hearing things that aren’t there)
  • Feeling hungry
  • Short-term memory loss
  • Euphoria (feeling very happy or excited)
  • Trouble focusing
  • Changes in your blood pressure
  • Faster heart rate
  • Confusion
  • Nausea (feeling like you’re going to throw up)
  • Vomiting (throwing up)
  • Flushing (when your skin becomes red or warm)
  • Depression (strong feelings of sadness)
  • Insomnia (trouble falling asleep, staying asleep, or waking up too early)

If you’re worried about any of these side effects, talk with your healthcare provider.

What else do I need to know?

Don’t take cannabis products if:

  • You have kidney, heart, or liver disease. Cannabis may make these worse.
  • You have psychiatric illnesses that affect mood, thinking, and behavior. Cannabis may make these conditions worse.
  • You’re taking nivolumab (Opdivo®). Cannabis can lower the response to this medication in patients with advanced melanoma, non-small-cell lung cancer, and renal clear cell carcinoma.
  • You’re taking warfarin (Jantoven® or Coumadin®) or other blood thinners. Cannabis can increase your risk of bleeding.
  • You’re taking fluoxetine (Prozac®) or disulfiram (Antabuse®). Taking cannabis with these medications can cause confusion, elevated mood, inflated self-esteem, decreased need for sleep, racing thoughts, and trouble focusing.
  • You’re on amphetamines (Adzenys XR-ODT, Evekeo ODT). Heart damage may occur with cannabis
  • You’re taking atropine (Atropen®). Taking this medication and cannabis can cause heart damage.
  • You’re on cocaine. Heart damage may occur with cannabis
  • You’re taking pseudoephedrine (such as Sudafed ®), epinephrine (such as Auvi-Q®) or the prescription drug dobutamine (Dobutamine). Taking these medications and cannabis can cause heart damage.
  • You’re taking medication that helps you sleep such as lorazepam (Ativan®), diazepam (Valium®), or zolpidem (Ambien®). Taking these medications and cannabis can increase drowsiness.

Don’t give cannabis products to children with epilepsy who are on clobazam (Onfi®). Cannabis can increase its side effects

Don’t use medical marijuana for anything other than managing your cancer-related symptoms. Non-medical use of cannabis is illegal under federal law.

For Healthcare Professionals

Scientific Name
Cannabis sativa
Clinical Summary

Cannabis sativa is an annual flowering herb native to East Asia, but is now cultivated around the world. Its uses as a source of industrial fiber, seed oil, and as a recreational agent date back thousands of years across cultures. It has also been employed in traditional medicine as an analgesic, hypnotic, and hallucinogenic, as a sedative, and for reducing inflammation. Preparations containing flowers (marijuana) and leaves; hashish derived from the resinous extract of the plant are consumed orally; by smoking in cigarettes, cigars, pipes, water pipes, or “blunts” (cannabis rolled in the tobacco-leaf wrapper from a cigar); or by vaporizing. Cannabis tinctures, teas, ointments, and oil-based extracts that can be mixed into food products are also popular. It is currently the most widely used illicit agent by more than 147 million people worldwide (1), and the common route of consumption is via inhalation. Because of the potential for high abuse and dependence, and its classification as a Schedule I agent by the Controlled Substances Act in 1970, cannabis use is a controversial subject in the US.

Pharmacologic investigations over the last few decades revealed cannabinoids (terpenoids) to be the active constituents. Delta-9-tetrahydrocannabinol (THC) is the chief psychoactive component whereas cannabidiol (CBD) is a major secondary non-psychoactive cannabinoid, and may modulate the effects of THC. It has antipsychotic, anticonvulsive, and anxiolytic effects. When co-administered, CBD was reported to mitigate the adverse psychotropic and cardiovascular effects associated with THC (2).

Cannabis has been studied for its utility in treating pain, symptoms of neurological disorders, AIDS and cancer.
A systematic review reported significant relief from pain due to neuropathy, fibromyalgia, rheumatoid arthritis, and mixed chronic pain following cannabinoid use compared to placebo (3) but another review determined placebo as a contributor to pain reductions (73). In addition, a 4-year prospective study involving 1,514 patients with chronic non-cancer pain did not find evidence that cannabis use decreased pain severity or interference, or exerted an opioid-sparing effect (4)

In a Cochrane review of four trials involving 48 epileptic patients, short-term CBD use was reported to be well tolerated with no adverse effects, but limited evidence precluded definitive conclusions to be reached on efficacy (5). Newer randomized studies of patients with either Lennox-Gastaut syndrome or Dravet syndrome, both rare forms of epilepsy, reported effectiveness of Epidiolex, an oral CBD solution, for reducing the frequency of seizures (6). This is now an FDA-approved drug (7). Additionally, data indicate benefits of cannabinoids for treating spasticity and neuropathic pain in multiple sclerosis (MS) patients (8). The American Academy of Neurology issued a Summary of Systematic Reviews for Clinicians indicating that oral cannabis extract is effective in reducing patient-reported spasticity scores and central pain or painful spasms associated with MS (9).

Conclusions from a large, comprehensive review of 79 trials (6462 subjects) indicate low-quality evidence to address weight gain from HIV infection, sleep disorders, increasing appetite, and for Tourette syndrome, along with elevated risk of short-term adverse effects (10). The evidence for recommending cannabinoids to treat symptoms of dyskinesia, Parkinson’s and Huntington’s diseases, irritable bowel syndrome, and addiction has been deemed unavailable or insufficient (11).

In children with autism-spectrum disorder, a CBD-rich cannabis extract improved social interaction as well as features that often co-exist with ASD (80).

In oncology settings, preclinical findings from 34 studies suggest selective cytotoxic effects of cannabinoids against glioma cells (sparing normal brain cells) via apoptosis, toxicity, autophagy and necrosis (12). A clinical study of 9 patients with recurrent glioblastoma multiforme receiving chemotherapy did not find any benefit with intratumoral THC, but it was well tolerated (13). Data from another study involving 21 glioblastoma patients, in which oromucosal whole plant extract nabiximols (contains THC +CBD) was used, have yet to be published (14). In addition, a cannabinoid resin extract was reported to affect dose-dependent disease control in a patient with acute lymphoblastic leukemia (20).  But a retrospective observational study showed that concomitant use of cannabis during immunotherapy with nivolumab was associated with reduction in tumor response rate in patients with advanced melanoma, non-small-cell lung cancer, and renal clear cell carcinoma. Progression-free survival and overall survival remained unaffected (21).

For symptom management, systematic reviews (10) (15) show that patients who used cannabis-based products experienced less chemo-induced nausea and vomiting compared to those on placebo group or on antiemetics. The differences were not statistically significant and adverse effects including “feeling high,” dizziness, sedation, and dysphoria were reported, resulting in a high dropout rate.  Noteworthy are the 2017 American Society of Clinical Oncology (ASCO) guidelines on antiemetics that recommend dronabinol and nabilone for nausea and vomiting, which is resistant to standard therapy (16).

Findings on effectiveness of cannabis against cancer pain are encouraging. Clinical data indicate reductions in pain with orally administered THC and nabiximols spray in advanced cancer patients (17) and with balanced THC:CBD products in cancer patients (81). In addition, incorporating medical cannabis early in the treatment as opposed to delayed start resulted in decreased opioid use along with improved pain control in this population (71). Cannabis has also been investigated for its role in ameliorating cancer-related anorexia-cachexia syndrome (CACS), but neither cannabis extract nor THC were found useful in a randomized trial of patients with advanced cancer (18). Additional case reports suggest that dronabinol may be useful for managing persistent symptomatic paraneoplastic night sweats in cancer patients (19). In a randomized uncontrolled study, THC-containing medicinal cannabis was found to improve sleep, functional well-being, and quality of life in patients with high grade gliomas (67). Data are insufficient to determine effectiveness against depression, anxiety or stress (82)

Although some data suggest potential benefits, cannabis remains a contentious issue because non-medical use is associated with high risk of addiction, especially when used from an early age (22) (23); dependence (24); adverse effects (25); and with withdrawal syndrome (irritability, sleeping difficulties, dysphoria, craving, and anxiety) (26) that makes cessation tough, eventually leading to relapse. Cannabis use was also reported to elevate the risk of creating false memories (62).

It is also important to note that synthetic cannabinoid drugs cause more serious adverse effects compared to natural cannabis, and include respiratory difficulties, hypertension, tachycardia, chest pain, muscle twitches, acute renal failure, anxiety, agitation, psychosis, suicidal ideation (27) and cognitive impairment (27) (83).

Some studies suggest utility of nicotine patch in decreasing negative affect-related withdrawal symptoms in individuals with cannabis use disorder (63); and in patients with cannabis dependence, nabiximols combined with psychosocial interventions reduced cannabis use (58). However, an incentive-based intervention was ineffective in individuals with early psychosis and problematic cannabis use (59).

Despite the controversy surrounding cannabis use, California became the first state to legalize it for “medical use” in 1996. As of May 2021, it is available in 35 more states and the District of Columbia (DC) as a medicinal agent, with 16 states and DC also allowing recreational use. Current indications that qualify for medical cannabis use include cancer symptoms, non-cancer pain, glaucoma, AIDS, epilepsy, and MS. However, cannabis use remains illegal under federal law. Following a review of available scientific evidence, the Institute of Medicine (28), and the National Academies of Sciences, Engineering, and Medicine recommend that further research be done to develop a comprehensive understanding of the health effects of cannabis (11), which can inform medical cannabis policy. Barriers to research include regulatory issues that involve the FDA, Drug Enforcement Administration, National Institute on Drug Abuse, and Institutional Review Boards; procuring cannabis for studies; and methodological challenges of establishing an acceptable route of administration and standardized doses (29).

With the growing popularity of cannabis among cancer patients, it is important that oncology providers be aware of emerging data so they can counsel patients about its use (72). Oncology guidelines recommend against using cannabis and/or cannabinoids as a cancer-directed treatment unless within the context of a clinical trial. Whether cannabis and/or cannabinoids improve any supportive care outcomes, with the exception of chemo-induced nausea and vomiting, is also uncertain (74) (75) (79). Additionally, a systematic review determined that rigorous evidence is lacking to inform the dosing, safety, and efficacy of cannabinoids in children with cancer (76).

Purported Uses and Benefits
  • Pain
  • Glaucoma
  • Chemo-induced nausea and vomiting
  • Sleep Disorders
  • Epilepsy
  • Multiple Sclerosis
  • Mood disorders
  • Loss of appetite
Mechanism of Action

Cannabinoids are the active constituents that mimic endogenous cannabinoids, and their activity is based on a receptor-mediated mechanism. THC exerts psychoactive and pain-relieving effects by acting as a partial agonist of cannabinoid receptors CB1 (predominantly expressed in the central nervous system) and CB2 (associated with the immune system). CB1 and CB2 are members of the G protein-coupled receptors (30), and are activated through inhibition of adenylate-cyclase. The activation in turn inhibits the release of neurotransmitters acetylcholine and glutamate, while indirectly affecting opioid and serotonin receptors, gamma-aminobutyric acid and N-methly-D-asparate (31). The antiemetic effect of nabilone is due to its ability to activate CB receptors in the brain, which mediate nausea and vomiting (32).

Mechanisms by which CBD exerts its effects include activation of the serotonin receptor 5-HT1A (33); inhibition of reuptake and/or metabolism of anandamide, an endocannabinoid; activation of transient receptor potential vanilloid (TRPV1) channels; inhibition of adenosine reuptake; agonism of PPAR-gamma receptors; by intracellular increase in calcium ions; as well as via anti-oxidative activity (34).

After inhalation of cannabis, THC is detectable in plasma within seconds, with peak plasma concentration achieved within 3-10 minutes. The bioavailability of THC varies and depends on the depth of inhalation, puff duration, and breath-hold. The systemic bioavailability is estimated to be ∼23-27% for heavy users; and 10-14% for occasional users. 
Following onset of smoking (cigarette containing 15.8 or 33.8 mg THC), the maximum THC plasma concentration (84.3 and 162.2 ng/mL) is attained at about 8 minutes and within 3-4 hours, falls rapidly to 1-4 ng/mL (35).
When compared to smoking and inhalation, systemic absorption following oral ingestion was slower, with maximum plasma concentration (4.4-11 ng/mL for 20 mg; and 2.7-6.3 ng/mL for 15 mg) of THC attained in 1-2 hours.  Substantial metabolism in the liver, via microsomal hydroxylation and oxidation catalyzed by enzymes of cytochrome P450 complex, likely lowers oral bioavailability of THC by 4-12%.
Much of the cannabis (80-90%) is excreted within 5 days in the form of hydroxylated and carboxylated metabolites (more than 65% of cannabis is excreted in the feces, with about 20% in urine). It is also important to note that residual THC levels have a half-life of 1.3 days in infrequent users compared to 5-13 days in frequent users (36).

Data on cannabidiol indicate the half-life to be between 1.4 and 10.9 h following oromucosal spray; 2–5 days following chronic oral administration; 24 h following intravenous administration; and 31 h following smoking. Bioavailability after smoking was 31%, but has yet to be determined with other routes. The maximum concentration is reached much faster following smoking and inhalation compared to oral and oromucosal routes. The Tmax has been reported to be achieved between 0 and 4 h (37).


Cannabis products should not be used by patients with psychiatric, cardiovascular, renal, or hepatic illnesses (38).

Adverse Reactions
  • Short-term adverse effects following use of medical cannabinoids include dizziness, dry mouth, nausea, fatigue, somnolence, euphoria, vomiting, disorientation, drowsiness, confusion, loss of balance, and hallucination (10)
  • Chronic bronchitis in regular users of cannabis products compared to non-users (39)
  • Inhalation is associated with myocardial infarction, sudden cardiac death, cardiomyopathy, stroke, transient ischemic attack, and cannabis arteritis (40)
  • Cannabis use has been associated with increased risk of rare, but life-threatening cardiac dysrhythmia (64); as well as both acute coronary syndrome and chronic cardiovascular disease (65).
  • Long-term cannabis use was shown to be detrimental to functional connectivity in the developing brain (41)
  • Risk of addiction  (22) (23)
  • Withdrawal syndrome (irritability, sleeping difficulties, dysphoria, craving, and anxiety) (26) and psychotic episodes (77) upon cessation. 
  • Cannabis hyperemesis syndrome (CHS), characterized by cyclic attacks of nausea and vomiting in chronic cannabinoid users, has been attributed to two deaths (42). In another case series, four patients were reported to experience relief from CHS following administration of benzodiazepines (60).
  • Non-ischaemic cardiomyopathy and cardioembolism: In a recreational cannabis + tobacco smoker. He also developed gangrene in his left forearm as a result of left radial artery thrombosis. The patient was managed in the line of decompensated heart failure, with the right-hand gangrene requiring amputation (68).
  • Perioperative morbidity: A large retrospective analysis found cannabis abuse to be associated with increased perioperative morbidity among elective spine surgery patients (69).
  • Catatonia: Associated with cannabis use necessitating electroconvulsive therapy (ECT) (78) (84) (85).
  • Pneumothorax: Associated with cannabis use (86) (87).
  • Serotonin syndrome: In a male, with a diagnosis of bipolar disorder managed with fluoxetine, melatonin, and lithium, following use of THC vape pen (88).
  • Acute toxic hippocampal encephalopathy: In a male, associated with cannabis use (89).
Herb-Drug Interactions
  • Cytochrome P450 substrates: Smoking cannabis induces CYP1A2, with additive effects when smoked together with tobacco, and can affect the intracellular concentration of drugs metabolized by this enzyme (43)
  • Cytochrome P450 substrates: In vitro, CBD strongly inhibits CYP2C19 (44)and CYP2C9 (45). Clinical relevance is not known.
  • Immunotherapy (nivolumab): Combined use with cannabis was associated with a reduction in treatment response rates in patients with advanced melanoma, non-small-cell lung cancer, and renal clear cell carcinoma (observational study) (21) (46)
  • Warfarin: THC and CBD both elevate international normalized ratio (INR) levels (45) (47) (61)
  • Fluoxetine: Case reports of mania resulting from co-administration of cannabis (48)
  • Disulfiram: Delirium and hypomania resulting from co-administration with cannabis (49) (50)
  • Amphetamines, cocaine, atropine and sympathomimetic agents: Cardiotoxicity may occur with cannabis via additive hypertension and tachycardia (51) (52)
  • Sedatives or hypnotics: Sedation and significant pharmacodynamic interactions when taken with cannabis via potentiation of central effects (53)
  • P-glycoprotein substrates: CBD inhibits P-glycoprotein and may influence metabolism of certain drugs (54). Clinical relevance is not known.
  • Clobazam: CBD increased clobazam levels in epileptic children (55).
  • Buprenorphine: A retrospective study found that cannabis use decreased the formation of norbuprenorphine and elevated buprenorphine and norbuprenorphine levels in liver healthy individuals on opioid maintenance therapy substituted with buprenorphine. This interaction may lead to increased or altered opioid activity and risk of intoxication (66).
  • Citalopram/Escitalopram: CBD significantly elevated citalopram plasma concentrations in patients taking citalopram or escitalopram. But it is unclear whether this also increased SSRI-mediated adverse effects (70).
  • Oxazepam: A study done in human microsomes found a strong inhibitory effect of major cannabinoids on the UGT-mediated glucuronidation of R,S-oxazepam metabolism (90). Clinical relevance has yet to be determined. 
  • Cyclosporine and mycophenolate mofetil: In a patient with end-stage kidney disease with a kidney transplantation, after adding CBD for pain. A drop in the levels of cyclosporine and mycophenolate mofetil levels was observed, thought to be via induction of CYP 3A4 and inhibition of hepatic esterase (91). CBD was later discontinued.
Dosage (OneMSK Only)
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