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Can I take Cannabis and Clozapine together?

Guía de interacción de medicamentos

Using cannabis while taking clozapine can significantly change the levels of the medicine in your blood. It can also increase the risk of serious side effects like extreme drowsiness, confusion, and heart problems. If you stop or start smoking cannabis suddenly, your clozapine levels could become dangerously high or too low, potentially leading to a relapse of your symptoms or severe toxicity.

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Por qué sucede esto

Cannabis smoke contains chemicals (hydrocarbons) that speed up the liver enzymes responsible for breaking down clozapine. This can lower the amount of medicine in your system. Conversely, if you stop smoking, the levels can rise rapidly. Additionally, both substances affect the central nervous system and heart rate, leading to 'additive' effects where the side effects of both are intensified.

You must speak with your doctor or psychiatrist before using cannabis or if you plan to change your current usage habits. Your doctor will likely need to perform more frequent blood tests to monitor your clozapine levels and may need to adjust your dose. Do not stop or start using cannabis abruptly without medical supervision.

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Infection or flu-like symptoms

You must have regular blood tests because clozapine can cause a dangerous drop in white blood cells (agranulocytosis). Contact your doctor immediately if you develop a sore throat, fever, or any signs of infection.

Smoking status changes

If you stop or start smoking tobacco, you must tell your doctor immediately. Tobacco smoke changes how your body breaks down clozapine; stopping smoking can cause clozapine levels to rise to toxic, dangerous levels.

Myocarditis (heart muscle inflammation)

Clozapine carries a risk of serious heart inflammation, especially in the first two months. Contact your doctor immediately if you experience a persistent fast heartbeat at rest, chest pain, or shortness of breath.

Estreñimiento

Clozapine can severely slow down your bowels (paralytic ileus), which can be fatal. You must tell your doctor if you become constipated or have not had a bowel movement for more than two days.

Psychosis or Schizophrenia

You must not use cannabis if you have a personal or strong family history of schizophrenia or other psychotic disorders, as it can trigger or worsen these conditions.

Driving and operating machinery

It is an offence to drive if your ability is impaired by cannabis. Even if you do not feel 'high', the drug stays in your system and can result in a drug-driving conviction.

Caffeine (Coffee, Tea, Cola, Energy drinks)

Caffeine can significantly increase the levels of clozapine in your blood, which may increase the risk of side effects. If you suddenly stop drinking caffeine, your clozapine levels may drop, making the medicine less effective. Try to keep your caffeine intake consistent and talk to your doctor before making any major changes.

Alcohol

Alcohol can increase the sedative effects of both clozapine and cannabis, making you feel very sleepy, dizzy, or confused. It can also increase the risk of falls and impair your coordination. It is best to avoid alcohol while taking these medicines.

Jugo de toronja

Grapefruit juice can interfere with how your body breaks down certain compounds in cannabis (like CBD and THC). This may increase the levels of the medicine in your blood and lead to more side effects.

Comidas ricas en grasa

Eating a meal high in fat (such as a cooked breakfast or fast food) just before or after taking oral cannabis can significantly increase the amount of the medicine absorbed by your body. This may lead to stronger or more unpredictable effects.

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Descargo de responsabilidad

Esta información es solo para fines educativos generales y no debe considerarse como un sustituto del consejo médico profesional. Siempre consulte a su médico de cabecera, farmacéutico u otro profesional de la salud calificado antes de tomar decisiones sobre sus medicamentos. Las circunstancias individuales pueden variar, y solo un profesional de la salud que conozca su historial médico puede proporcionar orientación personalizada.

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Historial del artículo

La información en esta página está escrita y revisada por pares por clínicos calificados.

  • 25 Ene 2026 | Publicado originalmente
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