Drug interactions
Phenytoin + Tesamorelin
Severity: Minor
Phenytoin and Tesamorelin: minor 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
Tesamorelin raises growth hormone and IGF-1, which may alter hepatic cytochrome P450 activity. This could change phenytoin clearance, though the effect is not well characterized.
What this interaction means in plain words
Phenytoin and Tesamorelin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Growth hormone axis effects on CYP450 activity may alter phenytoin metabolism; the mechanism is not firmly established.
What to do
Check phenytoin serum levels after starting or stopping tesamorelin and adjust the dose according to levels and seizure control.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Phenytoin
- Artemether / lumefantrine + Phenytoin Contraindicated
- Bictegravir + Phenytoin Contraindicated
- Cabotegravir + Phenytoin Contraindicated
- Doravirine + Phenytoin Contraindicated
- Elbasvir / grazoprevir + Phenytoin Contraindicated
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Phenytoin Contraindicated
Frequently asked questions
Can I take Phenytoin with Tesamorelin?
MediHelp rates the interaction as minor. Phenytoin and Tesamorelin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Tesamorelin raises growth hormone and IGF-1, which may alter hepatic cytochrome P450 activity. This could change phenytoin clearance, though the effect is not well characterized.
How serious is the interaction between Phenytoin and Tesamorelin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check phenytoin serum levels after starting or stopping tesamorelin and adjust the dose according to levels and seizure control.
What other medicines interact with Phenytoin?
MediHelp also lists interactions of Phenytoin with, for example, Artemether / lumefantrine, Bictegravir, Cabotegravir. The full list is on the Phenytoin page.
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