CBD instead of antidepressants: Latest study results offer hope

Depression is becoming a widespread disease. According to the WHO, over 300 million people worldwide suffer from a form of depression, and this number is rising. The illness ranges from mild depressive moods to severe episodes that can severely restrict life and have life-threatening consequences.

This makes the search for effective treatment methods all the more important. Classical antidepressants have long become the standard – and in many cases, they work very well against typical symptoms. The problem: Antidepressants also have side effects – for some people so severe that they and researchers are frantically looking for alternatives.

A particularly promising candidate: Cannabidiol (CBD). Studies have shown that this active ingredient could have a positive effect on mood and other symptoms. But is that enough to treat depression? We examine what CBD can really do.

Hardly imaginable today: Antidepressants in the form we know them have only existed since the 1950s. Before that, psychotherapeutic approaches and – as gruesome as it sounds – electroshock therapies were used.

Antidepressants made it possible for the first time to specifically influence the biochemistry of the brain. This is because, in many cases, depression has a physical cause. Often, the balance of neurotransmitters in the brain is disrupted. Antidepressants such as selective serotonin reuptake inhibitors (SSRIs) or serotonin-norepinephrine reuptake inhibitors (SNRIs) increase the concentration of certain neurotransmitters at the relevant sites in the brain and can thus stabilize mood.

However, typical antidepressants do not work equally well for all patients. In addition, for many people, antidepressants cause side effects such as erectile dysfunction/loss of libido, weight gain, fatigue, restlessness, sleep disturbances, or the feeling of only dully experiencing emotions. Those affected are less lethargic and sad, but strong joy and enthusiasm are also absent.

Furthermore, antidepressants can lead to additional unwanted effects when discontinued. Those who want to reduce the dose after months or years often experience dizziness, flu-like symptoms, headaches, or strong emotional instability.

It seems no wonder, then, that many people would prefer to manage without or at least with fewer antidepressants.

Cannabidiol, or CBD for short, is one of over 100 active ingredients that occur naturally in the cannabis plant. Unlike the more well-known cannabinoid THC, it is not intoxicating – it does not bind to the body's own cannabinoid receptors, but only modulates them.

What sounds like hair-splitting has a whole range of effects: THC binds to CB1 receptors in the brain (especially in the hippocampus, cerebellum, and prefrontal cortex) and to CB2 receptors in the immune system. This creates the well-known psychoactive effects such as a euphoric feeling, altered perception, and increased appetite. At the same time, THC can also particularly effectively relieve pain.

You can find more information about the effect of CBD on the endocannabinoid system in our article " The Endocannabinoid System: How CBD Works in Your Body".

The problem: In high doses or with high sensitivity to the active ingredient, THC can trigger anxiety or even psychosis. Therefore, THC is not suitable for people with a history of mental illness!

CBD, on the other hand, works differently. Among other things, it indirectly influences CB1 and CB2 receptors, acts on serotonin receptors, and on signaling pathways in the brain. In addition, antioxidant and anti-inflammatory properties have been observed. How exactly CBD works is still the subject of further research.

However, pharmacologists and doctors are very interested in CBD – and see it as a possible candidate for treating a whole range of diseases. These include epilepsy, anxiety disorders, pain, and also depression. It is suspected that CBD can not only improve mood but also has neuroprotective and stress-reducing effects.

While clear antidepressant effects have long been observed in animal models, the evidence in humans is still thin. However, many anecdotal reports suggest that CBD could at least help with mild mood swings – and without the side effects typical of antidepressants.

While antidepressants come with a whole bouquet of sometimes severe side effects, users of CBD have so far reported mainly rather mild side effects. But: Antidepressants have been prescribed and studied since the 1950s. For CBD, there is mainly anecdotal evidence so far. It is therefore possible that further side effects will be observed as research progresses.

Some undesirable effects of CBD are already known today: studies report fatigue, diarrhea, changes in appetite and, above all, interactions with other medications, as CBD can inhibit enzymes in the liver that are responsible for breaking down many drugs. This includes blood thinners, antiepileptics and certain psychotropic drugs. Therefore, please talk to your doctor and/or therapist before starting CBD therapy.

As mentioned, research on CBD is currently developing rapidly - but compared to research on antidepressants, it is still in its infancy. Nevertheless, there are some interesting findings:

A study published in 2018 showed a significant antidepressant effect of CBD in an animal model through the activation of serotonin receptors - very similar to classical antidepressants. (1) A meta-study from 2020, however, emphasizes that CBD has demonstrable and consistent effects on anxiety and stress, but according to the authors, the data situation on depression is still too incomplete to make real statements. (2)

A pilot study from 2021 on adolescents with social anxiety reported significant improvements after repeated CBD administration. Based on this, it can be assumed that CBD could help with the typical accompanying symptoms/comorbidities of depression. (3)

A particularly exciting research approach in recent years has focused on the role of so-called "neuroinflammation" in depressive disorders. While for a long time only a disturbance in neurotransmitter balance was considered the cause of depression, the interplay of inflammatory processes in the brain, immune reactions and neuroplasticity, i.e. the ability of neural structures to reorganize themselves as needed, is now increasingly coming into focus.

Since CBD has demonstrable anti-inflammatory properties, a study was conducted on rats in 2024. (4) The animals received the chemotherapeutic agent doxorubicin, which can not only trigger cognitive impairments but also anxiety and depression-like symptoms.

Subsequently, the animals were given CBD for several weeks. The result was astonishing: CBD significantly mitigated the behavioral changes caused by doxorubicin. The animals showed fewer signs of anxiety and depressive mood. In parallel, the researchers observed changes in gene expression, which in turn indicates a reduction in inflammatory processes in the hippocampus and prefrontal cortex.

This shows two things: Firstly, CBD can probably alleviate the symptoms associated with classical depressive disorders. On the other hand, it shows that the effect goes beyond mere symptom control: CBD seems to specifically influence neuroinflammatory processes and could thus help even with the most severe depressions.

Important: While much indicates that CBD could be a real game-changer in the treatment of depression, clinical studies in humans are still lacking - also regarding the safety and side effect profile of CBD for depression.

An important point when it comes to treating depression with CBD: Many people with depression are already taking medication. The problem: Both CBD and most antidepressants are metabolized by the same liver enzymes (CYP450). This means that CBD can inhibit the breakdown of these medications and uncontrollably increase their concentration in the blood.

This in turn increases the risk of side effects such as fatigue, dizziness, nausea or cardiovascular problems. Particularly with SSRIs such as citalopram or sertraline, SNRIs such as duloxetine and venlafaxine, and tricyclic antidepressants, increased sedation, gastrointestinal problems or even cardiac arrhythmias can occur. In rare cases, the life-threatening serotonin syndrome can even occur.

The use of CBD for depression should therefore always be discussed with the treating doctor or therapist - especially if you are already taking other psychotropic drugs.

In Germany and many European countries, CBD is freely available as long as it comes from industrial hemp and the THC content is below 0.2 percent. It is usually sold as a dietary supplement or cosmetic, but not as a medicine. This means that manufacturers are not allowed to make healing claims.

At the same time, the lack of drug approval means that there are hardly any standardized preparations with guaranteed quality. However, precisely this would be necessary for therapeutic application. In countries like Canada or the USA, regulations are sometimes looser, which on the one hand makes sales and quality control easier, but also facilitates studies. In the medium term, new insights could emerge here that would then also have an impact on the German market.

Until then, CBD in Germany remains a complementary, but not officially recognized, means of treating mental illnesses. Doctors can prescribe cannabis products, but pure CBD products (e.g. CBD oil) are excluded from reimbursement by health insurance companies.

Despite all the euphoria, it is important to remember: while taking CBD oil has great potential for treating depression, nothing is yet certain, neither its effectiveness nor its interactions and side effects. There are also no studies or recommendations on dosage. At present, its use is based solely on experience.

Especially with a partially life-threatening illness such as depression, experiments should be avoided - at least when it comes to moderate to severe depression, which can be accompanied by considerable suffering and suicidal thoughts. Here, established therapies such as psychotherapy, antidepressants or a combination of both are necessary.

Even with mild depression, anxiety or to improve general well-being, CBD should only be used by affected individuals after medical consultation to rule out risks and possible interactions.

CBD is often described as a gentle and natural alternative to conventional antidepressants. And indeed, initial studies and numerous anecdotal reports show that the active ingredient can have positive effects on mood, stress, and anxiety. The fact that CBD generally causes fewer side effects than antidepressants also makes it very attractive to many affected individuals.

At the same time, the current data situation is still very limited. There are no confirmed statements on optimal dosage, long-term effectiveness, or possible risks. Antidepressants, on the other hand, have been researched for decades and have proven their effectiveness in hundreds of studies.

The use of CBD is therefore not a substitute for classical medication and psychotherapy according to current knowledge. Especially in moderate or severe cases, established treatment methods are indispensable because they demonstrably reduce the risk of serious consequences. CBD should only be used as a supplementary option and exclusively after medical consultation.

The hype is therefore quite understandable, and the hope justified. However, there is still a long way to go before CBD can be used as a standardized treatment for depression.

Medical disclaimer