Carbidopa and Levodopa

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Levodopa is a dopamine precursor used to treat the movement disorder symptoms of Parkinson's disease. Carbidopa is often included with levodopa-containing drugs (such as Sinemet) in order to boost its efficacy by slowing down the metabolism of dopamine. Read more...
More about Carbidopa/Levodopa
You can read more at US National Library of Medicine Medline Plus: http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a601068.html

What side effects can this medication cause? Return to top
Levodopa and carbidopa may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
dizziness
nausea
vomiting
loss of appetite
diarrhea
dry mouth
constipation
change in sense of taste
forgetfulness or confusion
nervousness
nightmares
difficulty falling asleep or staying asleep
headaches
weakness
increased sweating
drowsiness
Some side effects can be serious. If you experience any of the following symptoms, call your doctor immediately:
unusual or uncontrolled movements of the mouth, tongue, face, head, neck, arms, and legs
fast, irregular, or pounding heartbeat
depression
thoughts of death or killing oneself
hallucinating (seeing things or hearing voices that do not exist)
swelling of the face, throat, tongue, lips, eyes, hands, feet, ankles, or lower legs
hoarseness
difficulty swallowing or breathing
hives
black and tarry stools
red blood in stools
bloody vomit
vomiting material that looks like coffee grounds

Source: PatientsLikeMe