Drug interactions
Carbidopa + Nifedipine
Severity: Moderate
Carbidopa and Nifedipine: 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
Carbidopa, usually given with levodopa, can add to the blood pressure lowering effect of antihypertensives such as nifedipine. Orthostatic hypotension and dizziness may appear when therapy is started or the dose is raised.
What this interaction means in plain words
Carbidopa and Nifedipine 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.
Carbidopa belongs to Central Nervous System; Nifedipine belongs to Cardiovascular.
Why it happens
Additive hypotensive effect, mainly through levodopa-derived dopamine effects on vascular tone and autonomic regulation; carbidopa alone has little direct action.
What to do
Check supine and standing blood pressure when levodopa/carbidopa is started or titrated. Reduce the nifedipine dose if symptomatic hypotension develops.
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 Nifedipine
Other interactions of Carbidopa
Frequently asked questions
Can I take Carbidopa with Nifedipine?
MediHelp rates the interaction as moderate. Carbidopa and Nifedipine 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. Carbidopa, usually given with levodopa, can add to the blood pressure lowering effect of antihypertensives such as nifedipine. Orthostatic hypotension and dizziness may appear when therapy is started or the dose is raised.
How serious is the interaction between Carbidopa and Nifedipine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check supine and standing blood pressure when levodopa/carbidopa is started or titrated. Reduce the nifedipine dose if symptomatic hypotension develops.
What other medicines interact with Nifedipine?
MediHelp also lists interactions of Nifedipine with, for example, Amifostine, Amlodipine-benazepril, Apalutamide. The full list is on the Nifedipine page.
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