Drug interactions
Carbidopa + Clonidine
Severity: Moderate
Carbidopa and Clonidine: 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. Orthostatic hypotension may occur when it is started alongside clonidine.
What this interaction means in plain words
Carbidopa and Clonidine 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; Clonidine belongs to Cardiovascular.
Why it happens
Additive hypotensive effects, mainly from levodopa-derived dopamine, with central sympatholytic action of clonidine.
What to do
Monitor blood pressure including standing readings when starting or adjusting carbidopa-levodopa, and reduce the clonidine dose if needed.
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 Clonidine
- Acebutolol + Clonidine Major
- Amifostine + Clonidine Major
- Amiodarone + Clonidine Major
- Amoxapine + Clonidine Major
- Atenolol-chlorthalidone + Clonidine Major
- Atenolol + Clonidine Major
Other interactions of Carbidopa
Frequently asked questions
Can I take Carbidopa with Clonidine?
MediHelp rates the interaction as moderate. Carbidopa and Clonidine 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. Orthostatic hypotension may occur when it is started alongside clonidine.
How serious is the interaction between Carbidopa and Clonidine?
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 including standing readings when starting or adjusting carbidopa-levodopa, and reduce the clonidine dose if needed.
What other medicines interact with Clonidine?
MediHelp also lists interactions of Clonidine with, for example, Acebutolol, Amifostine, Amiodarone. The full list is on the Clonidine page.
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