Drug interactions
Methamphetamine + Olanzapine
Severity: Moderate
Methamphetamine and Olanzapine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Methamphetamine stimulates dopamine and norepinephrine release while olanzapine blocks dopamine and serotonin receptors, so each can partly oppose the other's effects. The result may be reduced efficacy of either drug, and tachycardia or QT-related effects can occur.
What this interaction means in plain words
Methamphetamine and Olanzapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Methamphetamine belongs to Central Nervous System; Olanzapine belongs to Central Nervous System.
Why it happens
Opposing pharmacodynamic actions at dopamine receptors, with some additive cardiovascular effects.
What to do
Monitor psychiatric symptoms, heart rate and blood pressure. Adjust doses according to clinical response.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Methamphetamine
- Isocarboxazid + Methamphetamine Contraindicated
- Linezolid + Methamphetamine Contraindicated
- Methamphetamine + Phenelzine Contraindicated
- Methamphetamine + Procarbazine Contraindicated
- Methamphetamine + Rasagiline Contraindicated
- Methamphetamine + Safinamide Contraindicated
Other interactions of Olanzapine
Frequently asked questions
Can I take Methamphetamine with Olanzapine?
MediHelp rates the interaction as moderate. Methamphetamine and Olanzapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Methamphetamine stimulates dopamine and norepinephrine release while olanzapine blocks dopamine and serotonin receptors, so each can partly oppose the other's effects. The result may be reduced efficacy of either drug, and tachycardia or QT-related effects can occur.
How serious is the interaction between Methamphetamine and Olanzapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor psychiatric symptoms, heart rate and blood pressure. Adjust doses according to clinical response.
What other medicines interact with Methamphetamine?
MediHelp also lists interactions of Methamphetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Methamphetamine page.
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