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Sinemet Review Article

 

Sinemet CR is a controlled-release tablet which is used to help relieve the muscle stiffness, weakness and tremor caused by Parkinson's disease. It is also used to relieve Parkinson-like symptoms caused by brain fever (encephalitis) , carbon monoxide poisoning, or manganese poisoning.

Key phrases: drug sinemet, sinemet 100, sinemet parkinson's, sinemet overdose, levodopa and carbidopa, levodopa 25, levodopa side effects, carbidopa levodopa, carbidopa-levo.

Dosage Packing Price Add to basket
250 mg 30 tab USD 25.00 Not in stock
250 mg 100 tab USD 65.00 Not in stock

Why is this drug prescribed?
Sinemet CR is a controlled-release tablet that may be given to help relieve the muscle stiffness, tremor, and weakness caused by Parkinson's disease. It may also be given to relieve Parkinson-like symptoms caused by encephalitis (brain fever), carbon monoxide poisoning, or manganese poisoning.

Sinemet CR contains two drugs, carbidopa and levodopa. The drug that actually produces the anti-Parkinson's effect is levodopa. Carbidopa prevents vitamin B6 from destroying levodopa, thus allowing levodopa to work more efficiently.

Parkinson's drugs such as Sinemet CR relieve the symptoms of the disease, but are not a permanent cure.

Most important fact about this drug:
There is also a regular, non-controlled-release form of this medication, which is called Sinemet. Over a period of hours, Sinemet CR, the controlled-release form, gives a smoother release of the drug than regular Sinemet. If you have been taking regular Sinemet, be aware that you may need a somewhat higher dosage of Sinemet CR to get the same degree of relief. Your first morning dose of Sinemet CR may take as much as an hour longer to start working than your first morning dose of regular Sinemet.

How should you take this medication?
Take Sinemet CR after meals, rather than before or between meals. Swallow the tablets whole without chewing or crushing them.
Sinemet CR releases its ingredients slowly over a period of 4 to 6 hours. It is important to follow a careful schedule, taking your doses at the same time every day.

You should not change the prescribed dosage or add another product for Parkinson's disease without first consulting your doctor.
Sinemet CR works best when there is a constant amount in the blood. Try not to miss any doses, and take them at evenly spaced intervals day and night.
If you miss a dose...
If you forget to take a dose, take it as soon as you remember. If it is almost time for your next dose, skip the one you missed and go back to your regular schedule. Do not take 2 doses at once.

Storage
Store at room temperature in a tightly closed container.

What side effects may occur?
Side effects from Sinemet CR cannot be anticipated. If any develop or change in intensity, inform your doctor immediately.
Only your doctor can determine if it is safe for you to continue taking Sinemet CR.
More common side effects may include:
Confusion, hallucinations, nausea, uncontrollable twitching or jerking
Less common or rare side effects may include:
Abdominal or stomach pain, abnormal dreams, agitation, anemia, anxiety, back pain, bizarre breathing patterns, bleeding from stomach, blisters, blurred vision, burning sensation of tongue, chest pain, clumsiness in walking, common cold, constipation, convulsions, cough, dark saliva, dark sweat, dark urine, delusions, depression, diarrhea, dilated pupils, disorientation, dizziness, dizziness upon rising from a sitting or lying position, double vision, dream abnormalities, drooling, drowsiness, dry mouth, euphoria, eyelid twitching, faintness, falling, fatigue, fever, flatulence, fluid retention, flushing, hair loss, headache, heart attack, heart palpitations, heartburn, hiccups, high or low blood pressure, hoarseness, hot flashes, increased sex drive, increased tremor, insomnia or other sleep problems, irregular heartbeat, leg pain, locked jaw, loss of appetite, malignant melanoma, memory problems, mental changes, muscle cramps, muscle twitching, nervousness, numbness, "on-off" phenomena, paralysis of certain muscles and unwanted movement of others, paranoia, persistent erection, phlebitis (swelling of a vein), rash, rolling eyes, shortness of breath, shoulder pain, slowed physical movements, sore throat, speech impairment, stomach ulcer, suicidal tendencies, swallowing difficulties, sweating, taste changes, teeth-grinding, tingling or pins and needles, upper respiratory infection, upset stomach, urinary frequency, urinary incontinence, urinary retention, urinary tract infections, weakness, weight loss or gain, writhing or flailing movements, vomiting

Why should this drug not be prescribed?
Do not take Sinemet CR if you are sensitive to or have ever had an allergic reaction to its ingredients.
Sinemet CR should not be prescribed if you have a suspicious, undiagnosed mole or a history of melanoma.

Special warnings about this medication:
Make sure your doctor knows if you have any of the following:
Bronchial asthma
Cardiovascular or lung disease (severe)
Endocrine (glandular) disorder
History of heart attack or heartbeat irregularity
History of active peptic ulcer
Kidney disorder
Liver disorder
Wide-angle glaucoma (pressure in the eye)

Your doctor will monitor your liver, blood, kidney and heart functions during extended therapy with Sinemet CR.
If you have been taking levodopa alone, you should stop taking levodopa for at least 12 hours before starting to take Sinemet CR.
The carbidopa contained in Sinemet CR cannot eliminate side effects caused by levodopa. Since carbidopa helps levodopa reach your brain, Sinemet CR may, in fact, produce some levodopa side effects--particularly twitching, jerking, or writhing--sooner and at a lower dosage than levodopa alone or even regular Sinemet. If such involuntary movements develop while you are taking Sinemet CR, you may need a dosage reduction.

Like levodopa, Sinemet CR may cause depression. Make sure your doctor knows if you have mental or emotional problems.
Muscle rigidity, high temperature, rapid heartbeat or breathing, sweating, blood pressure changes, and mental changes may occur when Sinemet CR is reduced suddenly or discontinued. If you stop taking this medication abruptly, your doctor should monitor your condition carefully. You may see a red, brown, or black coloration in your saliva, urine, or sweat. This is not harmful, but may stain your clothes. Too much stomach acid can interfere with absorption of the medication.

Possible food and drug interactions when taking this medication:
If Sinemet CR is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Sinemet CR with the following:
Antacids such as Di-Gel, Maalox, and Mylanta
Antiseizure drugs such as Dilantin
Antispasmodic drugs such as Artane and Cogentin
Antihypertensives such as Aldomet and Clonidine
High-protein foods
Isoniazid (Nydrazid)
Major tranquilizers such as Haldol, Mellaril, Risperdal, and Thorazine
MAO inhibitors such as the antidepressants Nardil and Parnate and the Parkinson's drug Eldepryl
Methionine drugs such as Pedameth
Metoclopramide (Reglan)
Papaverine (Pavabid)
Pyridoxine (Vitamin B6)
Tranquilizers such as Dalmane, Valium, and Xanax
Tricyclic antidepressants such as Elavil and Tofranil

If you have been taking an MAO inhibitor such as Nardil or Parnate, you must discontinue it at least 2 weeks before starting to take Sinemet CR.

A high-protein diet may impair the effectiveness of Sinement CR. Iron supplements can also reduce its effect.

Special information if you are pregnant or breastfeeding:
If you are pregnant or plan to become pregnant, inform your doctor immediately. Sinemet CR should be used during pregnancy only if the benefit outweighs the potential risk to the unborn child. It is not known whether Sinemet CR appears in breast milk. If this medication is essential to your health, your doctor may advise you to stop nursing your baby until your treatment with this drug is finished.

Recommended dosage:
Your doctor will tailor your individual dosage carefully, depending on your response to previous therapy and symptoms.

ADULTS:
For patients with mild to moderate symptoms, the initial recommended dose is 1 tablet of Sinemet CR taken 2 times a day.
Starting doses should be spaced out every 4 to 8 hours and then adjusted to each patient's individual response.
The usual long-term dose is 2 to 8 tablets per day, taken in divided doses every 4 to 8 hours during the waking day.
Higher doses (12 or more tablets per day) and shorter intervals (less than 4 hours) have been used, but are not usually recommended.
When doses of Sinemet CR are given at intervals of less than 4 hours, and/or if the divided doses are not equal, it is recommended that the smaller doses be given at the end of the day.
An interval of at least 3 days between dosage adjustments is recommended.
Dosage adjustment of Sinemet CR may be necessary if your doctor prescribes additional medications.

CHILDREN:
Use of Sinemet CR in children under 18 is not recommended.

Overdosage:
Too much Sinemet CR may cause muscle twitches, inability to open the eyes, or other symptoms of levodopa overdosage. Like other medications, Sinemet CR taken in excess can have serious consequences. If you suspect symptoms of a Sinemet CR overdose, seek medical attention immediately.


Sinemet notes:

Sinemet generic name carbidopa and levodopa is used to treat Parkinson symptoms such as muscle stiffness, tremors and spasms.
Carbidopa and levodopa is also used to treat Parkinson symptoms caused by carbon monoxide poisoning or manganese intoxication.
Levodopa side effects includes worsening of tremors, high fever, stiff muscles, sweating, fast or uneven heartbeats, rapid breathing, seizure, painful urination, severe nausea, vomiting, anxiety, agitation, depressed mood.

Drugs that can affect sinemet are metoclopramide, isoniazid, phenytoin, papaverine, amitriptyline, amoxapine, clomipramine or blood pressure medication.

The recommended dosage is carbidopa-levodopa 25-100 mg three times daily or as prescribed by doctor. Generally it is taken before or between meals. Seek emergency medical attention if you think you have taken overdose of sinemet.

Sinemet is available is packing of 100 tabs and 30 tabs.
Store carbidopa and levodopa at room temperature away from moisture, heat and light.


 

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