Drug interactions
Carbidopa-levodopa + Droxidopa
Severity: Moderate
Carbidopa-levodopa and Droxidopa: 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
Droxidopa is converted to norepinephrine by dopa decarboxylase. Carbidopa inhibits this enzyme peripherally and can reduce droxidopa's pressor effect, while levodopa itself may also add to blood pressure variability.
What this interaction means in plain words
Carbidopa-levodopa and Droxidopa 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-levodopa belongs to Central Nervous System; Droxidopa belongs to Cardiovascular.
Why it happens
Carbidopa inhibits peripheral aromatic L-amino acid decarboxylase, reducing conversion of droxidopa to norepinephrine.
What to do
Monitor supine and standing blood pressure and symptoms of orthostatic hypotension. A higher droxidopa dose may be needed, within labeled limits, and watch for supine hypertension.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Carbidopa-levodopa and Droxidopa, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Carbidopa-levodopa
- Carbidopa-levodopa + Isocarboxazid Contraindicated
- Carbidopa-levodopa + Phenelzine Contraindicated
- Carbidopa-levodopa + Selegiline transdermal Contraindicated
- Carbidopa-levodopa + Tranylcypromine Contraindicated
- Amisulpride + Carbidopa-levodopa Major
- Asenapine + Carbidopa-levodopa Major
Other interactions of Droxidopa
- Droxidopa + Lisdexamfetamine Major
- Droxidopa + Methamphetamine Major
- Droxidopa + Pseudoephedrine Major
- Adrenaline-articaine + Droxidopa Moderate
- Almotriptan + Droxidopa Moderate
- Caffeine + Droxidopa Moderate
Frequently asked questions
Can I take Carbidopa-levodopa with Droxidopa?
MediHelp rates the interaction as moderate. Carbidopa-levodopa and Droxidopa 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. Droxidopa is converted to norepinephrine by dopa decarboxylase. Carbidopa inhibits this enzyme peripherally and can reduce droxidopa's pressor effect, while levodopa itself may also add to blood pressure variability.
How serious is the interaction between Carbidopa-levodopa and Droxidopa?
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 supine and standing blood pressure and symptoms of orthostatic hypotension. A higher droxidopa dose may be needed, within labeled limits, and watch for supine hypertension.
What other medicines interact with Carbidopa-levodopa?
MediHelp also lists interactions of Carbidopa-levodopa with, for example, Isocarboxazid, Phenelzine, Selegiline transdermal. The full list is on the Carbidopa-levodopa page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
