Carbidopa and levodopa is a combination medicine used to treat symptoms of Parkinson's disease, such as stiffness or tremors.

Carbidopa and levodopa is also used to treat Parkinson symptoms caused by carbon monoxide poisoning or manganese intoxication.

Carbidopa and levodopa may also be used for purposes not listed in this medication guide.

You should not use this medicine if you are allergic to carbidopa or levodopa, or if you have:

• narrow-angle glaucoma.

Do not use this medicine if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, tranylcypromine, and others.

Tell your doctor if you have ever had:

• heart disease, high blood pressure, or heart attack;
• liver or kidney disease;
• an endocrine (hormonal) disorder;
• asthma, chronic obstructive pulmonary disease (COPD), or other breathing disorder;
• a stomach or intestinal ulcer;
• open-angle glaucoma; or
• depression, mental illness, or psychosis.

The disintegrating tablet may contain phenylalanine. Tell your doctor if you have phenylketonuria (PKU).

People with Parkinson's disease may have a higher risk of skin cancer (melanoma). Talk to your doctor about this risk and what skin symptoms to watch for.

Tell your doctor if you are pregnant or breastfeeding.

Use Sinemet CR (Oral) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

• uncontrolled muscle movements in your face (chewing, lip smacking, frowning, tongue movement, blinking or eye movement);
• worsening of tremors (uncontrolled shaking);
• severe or ongoing vomiting or diarrhea;
• confusion, hallucinations, unusual changes in mood or behavior;
• depression or suicidal thoughts; or
• severe nervous system reaction--very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, feeling like you might pass out.

Some people taking carbidopa and levodopa have fallen asleep during normal daytime activities such as working, talking, eating, or driving. Tell your doctor if you have any problems with daytime sleepiness or drowsiness.

You may have increased sexual urges, unusual urges to gamble, or other intense urges while taking this medicine. Talk with your doctor if this occurs.

You may notice that your sweat, urine, or saliva appears dark in color, such as red, brown, or black. This is not a harmful side effect, but it may cause staining of your clothes or bed sheets.

Common side effects may include:

• jerky or twisting muscle movements;
• headache, dizziness;
• low blood pressure (feeling light-headed);
• sleep problems, strange dreams;
• dry mouth;
• muscle contractions; or
• nausea, vomiting, constipation.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired. Avoid getting up too fast from a sitting or lying position, or you may feel dizzy.

Avoid taking iron supplements or eating a diet high in protein. These things can make it harder for your body to digest and absorb carbidopa and levodopa. Talk with your doctor or dietitian about the best foods to eat or avoid.