Drug interactions
Carbidopa + Labetalol
Severity: Minor
Carbidopa and Labetalol: 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
Carbidopa given with levodopa can enhance the hypotensive effect of antihypertensives, including labetalol, particularly postural hypotension. Carbidopa alone has little direct effect on blood pressure.
What this interaction means in plain words
Carbidopa and Labetalol have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Carbidopa belongs to Central Nervous System; Labetalol belongs to Cardiovascular.
Why it happens
Additive blood pressure lowering, mainly through levodopa-derived dopamine effects when carbidopa is combined with levodopa.
What to do
Monitor standing and sitting blood pressure when starting levodopa-carbidopa. Reduce the labetalol dose if symptomatic hypotension occurs.
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 Labetalol
- Amifostine + Labetalol Major
- Amiodarone + Labetalol Major
- Atenolol-chlorthalidone + Labetalol Major
- Atenolol + Labetalol Major
- Betaxolol + Labetalol Major
- Bisoprolol + Labetalol Major
Other interactions of Carbidopa
Frequently asked questions
Can I take Carbidopa with Labetalol?
MediHelp rates the interaction as minor. Carbidopa and Labetalol have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Carbidopa given with levodopa can enhance the hypotensive effect of antihypertensives, including labetalol, particularly postural hypotension. Carbidopa alone has little direct effect on blood pressure.
How serious is the interaction between Carbidopa and Labetalol?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor standing and sitting blood pressure when starting levodopa-carbidopa. Reduce the labetalol dose if symptomatic hypotension occurs.
What other medicines interact with Labetalol?
MediHelp also lists interactions of Labetalol with, for example, Amifostine, Amiodarone, Atenolol-chlorthalidone. The full list is on the Labetalol page.
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