Drug interactions
Fosinopril + Tizanidine
Severity: Moderate
Fosinopril and Tizanidine: 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
Tizanidine is a centrally acting alpha-2 agonist that lowers blood pressure, and fosinopril is an ACE inhibitor. Used together they can produce additive hypotension, sometimes with dizziness or syncope, especially when starting or increasing the dose.
What this interaction means in plain words
Fosinopril and Tizanidine 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.
Fosinopril belongs to Cardiovascular; Tizanidine belongs to Musculoskeletal.
Why it happens
Additive pharmacodynamic blood pressure lowering from central alpha-2 agonism and ACE inhibition.
What to do
Monitor blood pressure and orthostatic symptoms when starting or titrating either drug. Start tizanidine at a low dose and reduce the antihypertensive dose if symptomatic hypotension occurs.
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 Tizanidine
- Ciprofloxacin + Tizanidine Contraindicated
- Fluvoxamine + Tizanidine Contraindicated
- Pefloxacin + Tizanidine Contraindicated
- Pipemidic acid + Tizanidine Contraindicated
- Benzhydrocodone / acetaminophen + Tizanidine Major
- Brexanolone + Tizanidine Major
Other interactions of Fosinopril
- Aliskiren + Fosinopril Contraindicated
- Fosinopril + Protein a column Contraindicated
- Fosinopril + Sacubitril / valsartan Contraindicated
- Fosinopril + Sacubitril-valsartan Contraindicated
- Amifostine + Fosinopril Major
- Amiloride + Fosinopril Major
Frequently asked questions
Can I take Fosinopril with Tizanidine?
MediHelp rates the interaction as moderate. Fosinopril and Tizanidine 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. Tizanidine is a centrally acting alpha-2 agonist that lowers blood pressure, and fosinopril is an ACE inhibitor. Used together they can produce additive hypotension, sometimes with dizziness or syncope, especially when starting or increasing the dose.
How serious is the interaction between Fosinopril and Tizanidine?
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 blood pressure and orthostatic symptoms when starting or titrating either drug. Start tizanidine at a low dose and reduce the antihypertensive dose if symptomatic hypotension occurs.
What other medicines interact with Tizanidine?
MediHelp also lists interactions of Tizanidine with, for example, Ciprofloxacin, Fluvoxamine, Pefloxacin. The full list is on the Tizanidine page.
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