Ketamine therapy has been gaining attention for its potential in addressing depression, anxiety, PTSD, and certain chronic pain conditions. While many patients may benefit from this treatment, there are groups of people for whom ketamine therapy may not be appropriate due to safety concerns, medical conditions, or other factors.
Following text outlines the situations and health profiles that could make a person unsuitable for this treatment.
Medical Conditions That May Prevent Suitability
Certain health conditions can increase risks during ketamine treatment. A full medical assessment is always recommended before starting.
- Uncontrolled high blood pressure – Ketamine can temporarily raise blood pressure, posing risks for those with hypertension.
- Heart disease – Individuals with a history of heart attack, heart failure, or arrhythmias may face complications due to cardiovascular stress.
- History of stroke – Increased blood pressure during treatment may raise the chance of another event.
- Severe liver problems – The liver metabolizes ketamine, and damage may affect how the drug is processed.
- Intracranial pressure disorders – Conditions such as certain brain tumors or injuries can worsen with ketamine use.
Mental Health Considerations
Although ketamine is being studied for mental health benefits, there are psychiatric conditions where its use requires extreme caution or avoidance.
- Schizophrenia – Ketamine can trigger or worsen psychotic symptoms.
- Active mania in bipolar disorder – It may intensify manic episodes.
- Unstable psychiatric conditions – Sudden mood swings or untreated severe mental illness may lead to unpredictable reactions.
Substance Use History
Past or present substance misuse can be a factor in determining candidacy. Ketamine carries a risk for dependency, especially for those with a history of addictive behaviors.
- History of ketamine abuse – Prior misuse increases the risk of relapse.
- Polysubstance abuse – Use of multiple substances can complicate treatment safety.
- Active addiction to drugs – This may interfere with monitoring and treatment outcomes.
Medication Conflicts
Some prescription or over-the-counter drugs can interact with ketamine, altering its effects or increasing side effects.
- Benzodiazepines – May reduce the effectiveness of ketamine therapy.
- Certain blood pressure medications – This cause unsafe fluctuations in cardiovascular function.
- Drugs that affect the central nervous system – Can amplify sedative effects and raise safety concerns.
Pregnancy and Breastfeeding
Ketamine therapy is generally not advised during pregnancy or while breastfeeding.
- Potential effects on fetal development – The drug crosses the placental barrier.
- Transfer through breast milk – Could impact the infant’s health.
Unrealistic Expectations
People who expect immediate, permanent relief without ongoing mental health support may not find ketamine therapy suitable. It is often part of a broader treatment plan rather than a single solution.
- Requires follow up care and possibly integration with counseling.
- May need repeated sessions for sustained benefits.
Age Restrictions
Ketamine therapy is primarily used for adults, and its safety profile in minors is still being studied.
- Children and adolescents – Limited research on long-term effects.
- Elderly patients – May have higher sensitivity to side effects due to other medical conditions.
Possible Side Effects That May Limit Use
Some patients are more prone to adverse reactions, which can make ketamine therapy unsafe or unpleasant.
- Hallucinations or dissociation during treatment
- Nausea and vomiting
- Elevated blood pressure and heart rate
- Drowsiness or confusion after sessions
Pre Treatment Screening Is Essential
Before starting ketamine therapy, most clinics require a comprehensive screening to assess physical and mental health. This includes:
- Full medical history review
- Mental health evaluation
- Medication list check
- Discussion of treatment goals and risks
Groups That May Require Caution or Avoidance
Summary of profiles where ketamine therapy may not be advised:
- People with severe heart or liver disease
- Those with active psychosis or mania
- Pregnant or breastfeeding individuals
- Patients with uncontrolled high blood pressure
- Anyone with a history of ketamine or substance misuse
- People with unrealistic treatment expectations
Alternatives to Ketamine Therapy
When a patient is found unsuitable for ketamine treatment, other options may be explored depending on the condition being addressed.
- Traditional antidepressants – SSRIs, SNRIs, and tricyclics
- Psychotherapy – Cognitive Behavioral Therapy (CBT), EMDR, or talk therapy
- Other medical treatments – Electroconvulsive therapy (ECT), transcranial magnetic stimulation (TMS)
- Lifestyle and holistic approaches – Nutrition, exercise, mindfulness practices
It’s a reality that Ketamine therapy give potential benefits for certain patients, but it is not the right choice for everyone. Safety depends on a range of factors including medical history, mental health status, and personal circumstances. Careful screening and honest discussion with a qualified healthcare provider are the best ways to determine suitability.

