Parkinel tablets


  • Active Ingredient: Carbidopa
  • 300 mg, 125 mg, 110 mg
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What is Parkinel?

The active ingredient of Parkinel brand is carbidopa. Carbidopa is used with another medicine called levodopa to treat the symptoms of Parkinson's disease (stiffness, tremors, spasms, poor muscle control). Symptoms of Parkinson's disease may be caused by low levels of a chemical called dopamine (DOE pa meen) in the brain.

Used for

Parkinel is used to treat diseases such as: GTP-CH Deficiency, Neuroleptic Malignant Syndrome, Parkinsonian Tremor.

Side Effect

Possible side effects of Parkinel include: Hallucinations (seeing or hearing things that are not there).; Black, tarry, or bloody stools.; Trouble controlling body movements that is new or worse.; tightness in the chest or throat; trouble breathing or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.; Feeling very tired or weak.; Dry mouth..

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Parkinel levodopa side effects long term

One of the complications of long‐term treatment of Parkinson’s disease with levodopa is the development of motor complications e.g. dyskinesia; a jerky, dance‐like movement of the body. Generally clinicians add on drugs (to the levodopa regimen) from one of the other three classes of anti‐Parkinsonian treatments available (e.g. dopamine agonists, catechol‐O‐methyl transferase inhibitors or monoamine oxidase type B inhibitors). However, despite clinical trials having shown that these drugs are beneficial compared to placebo, it remains unclear as to the best way to treat patients experiencing motor complications and in particular, whether one class of drug may be more effective than another.

Before taking this medicine

You should not use Sinemet if you are allergic to it, or if you have:

Do not use Sinemet 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, rasagiline, selegiline, tranylcypromine, and others.

To make sure Sinemet is safe for you, tell your doctor if you have:

liver or kidney disease;

an endocrine (hormonal) disorder;

a stomach or intestinal ulcer;

open-angle glaucoma; or

a history of depression, mental illness, or psychosis.

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.

It is not known whether Sinemet will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

Parkinel and levodopa can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breast-feeding a baby.

The Sinemet disintegrating tablet may contain phenylalanine. Talk to your doctor before using this form of Parkinel and levodopa if you have phenylketonuria (PKU).

Parkinel levodopa dosage

Take levodopa only as directed. Do not take more or less of it, and do not take it more often than your doctor ordered.

For patients taking Parkinel and levodopa extended-release tablets:

  • Swallow the tablet whole without crushing or chewing, unless your doctor tells you not to. If your doctor tells you to, you may break the tablet in half.

Some people must take levodopa for several weeks or months before full benefit is received. Do not stop taking it even if you do not think it is working. Instead, check with your doctor.


  • Periodic evaluations of hepatic, hematopoietic, cardiovascular, and renal function.
  • Psychiatric: Development of new or increased gambling urges, sexual urges, or other intense urges.


AbbVie Inc. is providing this service to help patients find a doctor in their area who has prescribed Duopa.

No fees have been received by or paid to doctors for inclusion in this specialist locator directory. Inclusion of a physician in this directory does not represent an endorsement by or a recommendation from AbbVie Inc., nor does it imply that the doctor on the list will determine that Duopa is right for you.

You are ultimately responsible for the selection of a physician and it is an important decision that you should consider carefully. This tool is just one source of information available to you.

AbbVie Inc. is the maker and marketer ofDUOPA® (Parkinel and levodopa) enteral suspension.

How Parkinel/levodopa therapy works

Giving dopamine as a therapy by itself is ineffective, because it cannot cross the blood-brain barrier. However, levodopa can cross the blood-brain barrier and can relieve the motor symptoms of PD. 1,3,4 Levodopa is the precursor to dopamine – it is the substance that is used to make dopamine. 1,2

Parkinel is added to levodopa to prevent levodopa from being converted into dopamine in the bloodstream, which allows more of the medication to get to the brain. This also means that lower doses of levodopa can be given. The addition of Parkinel also reduces the risk of the side effects caused by dopamine in the rest of the body, such as nausea and vomiting. 1,2

Before using levodopa precautions

In deciding to use levodopa, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make.

Levodopa may cause some people to become dizzy, confused, or have blurred or double vision. Make sure you know how you react to levodopa before you drive, use machines, or do anything else that could be dangerous if you are not alert or not able to see well.

Dizziness, lightheadedness, or fainting may occur, especially when you get up from a lying or sitting position. Getting up slowly may help. If the problem continues or gets worse, check with your doctor.

For levodopa, the following should be considered:


Tell your doctor if you have ever had any unusual or allergic reaction to levodopa or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.


Studies on levodopa have been done only in adult patients, and there is no specific information comparing use of levodopa or Parkinel in children with use in other age groups.


Elderly people are especially sensitive to the effects of levodopa. This may increase the chance of side effects during treatment.


  • Pregnancy Category C (all Trimesters): Animal studies have shown an adverse effect and there are no adequate studies in pregnant women OR no animal studies have been conducted and there are no adequate studies in pregnant women.

Breast Feeding

  • Studies suggest that levodopa may alter milk production or composition. If an alternative to this medication is not prescribed, you should monitor the infant for side effects and adequate milk intake.

Patients with diabetes

Levodopa may cause test results for urine sugar or ketones to be wrong. Check with your doctor before depending on home tests using the paper-strip or tablet method.


Pregnancy Category C. No teratogenic effects were observed in a study in mice receiving up to 20 times the maximum recommended human dose of Parkinel and Levodopa tablets. There was a decrease in the number of live pups delivered by rats receiving approximately two times the maximum recommended human dose of Parkinel and approximately five times the maximum recommended human dose of levodopa during organogenesis. Parkinel and Levodopa tablets caused both visceral and skeletal malformations in rabbits at all doses and ratios of Parkinel/levodopa tested, which ranged from 10 times/5 times the maximum recommended human dose of Parkinel/levodopa to 20 times/10 times the maximum recommended human dose of Parkinel/levodopa.

There are no adequate or well-controlled studies in pregnant women. It has been reported from individual cases that levodopa crosses the human placental barrier, enters the fetus, and is metabolized. Parkinel concentrations in fetal tissue appeared to be minimal. Use of Parkinel and Levodopa extended-release tablets in women of childbearing potential requires that the anticipated benefits of the drug be weighed against possible hazards to mother and child.

Hyperpyrexia and Confusion

Sporadic cases of a symptom complex resembling neuroleptic malignant syndrome (NMS) have been reported in association with dose reductions or withdrawal of certain antiparkinsonian agents such as levodopa, Parkinel-levodopa, or Parkinel-levodopa extended-release. Therefore, patients should be observed carefully when the dosage of levodopa or Parkinel-levodopa is reduced abruptly or discontinued, especially if the patient is receiving neuroleptics.

Neuroleptic malignant syndrome (NMS) is an uncommon but life-threatening syndrome characterized by fever or hyperthermia. Neurological findings, including muscle rigidity, involuntary movements, altered consciousness, mental status changes; other disturbances, such as autonomic dysfunction, tachycardia, tachypnea, sweating, hyper-or hypotension; laboratory findings, such as creatine phosphokinase elevation, leukocytosis, myoglobinuria, and increased serum myoglobin, have been reported.

The early diagnosis of this condition is important for the appropriate management of these patients. Considering neuroleptic malignant syndrome (NMS) as a possible diagnosis and ruling out other acute illnesses (e.g., pneumonia, systemic infection, etc.) is essential. This may be especially complex if the clinical presentation includes both serious medical illness and untreated or inadequately treated extrapyramidal signs and symptoms. Other important considerations in the differential diagnosis include central anticholinergic toxicity, heat stroke, drug fever, and primary central nervous system (CNS) pathology.

The management of neuroleptic malignant syndrome (NMS) should include: 1) intensive symptomatic treatment and medical monitoring and 2) treatment of any concomitant serious medical problems for which specific treatments are available. Dopamine agonists, such as bromocriptine, and muscle relaxants, such as dantrolene, are often used in the treatment of neuroleptic malignant syndrome (NMS); however, their effectiveness has not been demonstrated in controlled studies.

I have had PD for about 10 years. Over the years, the length of time that a particular dose of Parkinel/levodopa works has gotten shorter. One dose used to last five hours, but recently, it lasts closer to three hours. In addition, sometimes my dose does not work at all. What is going on?

This shifting response to medication is known as motor fluctuations and can be a very significant challenge in the treatment of PD as the disease progresses. There are many strategies that your doctor can use to try to lengthen a dose of medication and even out your response to medication throughout the day. These strategies include changing the timing or strength of a dose, using different formulations of Parkinel/levodopa, or adding other medications. All of these strategies are summarized in a recent APDA webinar on enhancing communication.


Parkinel and Levodopa extended-release tablet contains Parkinel and Levodopa in a 1:4 ratio as either the 25 mg/100 mg tablet or the 50 mg/200 mg tablet. The daily dosage of Parkinel and Levodopa extended-release tablets must be determined by careful titration. Patients should be monitored closely during the dose adjustment period, particularly with regard to appearance or worsening of involuntary movements, dyskinesias or nausea. Parkinel and Levodopa extended-release tablets should not be chewed or crushed.

Standard drugs for Parkinson’s disease, other than levodopa without a decarboxylase inhibitor, may be used concomitantly while Parkinel and Levodopa extended-release tablet is being administered, although their dosage may have to be adjusted.

Since carb >6 ). Initial Dosage

Patients currently treated with conventional Parkinel levodopa preparations: Studies show that peripheral dopa-decarboxylase is saturated by the bioavailable carb >

Table 2: Approximate Bioavailabilities at Steady State *

What is Parkinel and levodopa?

Parkinel and levodopa is a combination medicine used to treat symptoms of Parkinson's disease, such as muscle stiffness, tremors, spasms, and poor muscle control. Parkinson's disease may be caused by low levels of a chemical called dopamine (DOE pa meen) in the brain.

Levodopa is converted to dopamine in the brain. Parkinel helps prevent the breakdown of levodopa before it can reach the brain and take effect.

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

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

Adverse Reactions

In controlled clinical trials, patients predominantly with moderate to severe motor fluctuations while on Parkinel and Levodopa tablets were randomized to therapy with either Parkinel and Levodopa tablets or Parkinel and Levodopa extended-release tablets. The adverse experience frequency profile of Parkinel and Levodopa extended-release tablets did not differ substantially from that of Parkinel and Levodopa, as shown in Table 1.

Table 1: Clinical Adverse Experiences Occurring in 1% or Greater of Patients


Management of acute overdosage with Parkinel and Levodopa extended-release tablet is the same as with levodopa. Pyridoxine is not effective in reversing the actions of Parkinel and Levodopa extended-release tablets.

General supportive measures should be employed, along with immediate gastric lavage. Intravenous fluids should be administered judiciously and an adequate airway maintained. Electrocardiographic monitoring should be instituted and the patient carefully observed for the development of arrhythmias; if required, appropriate antiarrhythmic therapy should be given. The possibility that the patient may have taken other drugs as well as Parkinel and Levodopa extended-release tablets should be taken into consideration. To date, no experience has been reported with dialysis; hence, its value in overdosage is not known.

Based on studies in which high doses of levodopa and/or Parkinel were administered, a significant proportion of rats and mice given single oral doses of levodopa of approximately 1500 to 2000 mg/kg are expected to die. A significant proportion of infant rats of both sexes are expected to die at a dose of 800 mg/kg. A significant proportion of rats are expected to die after treatment with similar doses of Parkinel. The addition of Parkinel in a 1:10 ratio with levodopa increases the dose at which a significant proportion of mice are expected to die to 3360 mg/kg.

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