Cinemet CR Tablet (Controlled Release)
Tablet (Controlled Release)
ACI LimitedGeneric:
Levodopa + CarbidopaWeight:
200 mg+50 mgbest Price:
৳ 12.50Generic
Levodopa + Carbidopa
Pharmacology
Levodopa, the metabolic precursor of dopamine, crosses the blood-brain barrier and is converted to dopamine in the brain. Carbidopa is a dopa decarboxylase (DDC) inhibitor which reduces the peripheral metabolism of Levodopa to dopamine, and thus, more Levodopa becomes available to the brain.
Dosage Administration
Patients currently treated with conventional levodopa/decarboxylase inhibitor combinations: Dosage with Levodopa-Carbidopa prolonged-release tablet should be substituted initially at an amount that provides no more than approximately 10% more levodopa per day when higher dosages are given (more than 900 mg per day). The dosing interval between doses should be prolonged by 30 to 50% at intervals ranging from 4 to 12 hours. It is recommended to give the smaller dose, if divided doses are not equal, at the end of the day. The dose needs to be titrated further depending on clinical response, as indicated below under 'Titration'. Dosages that provide up to 30% more levodopa per day may be necessary. A guide for substitution of Levodopa Carbidopa prolonged-release tablet treatment for conventional levodopa/decarboxylase inhibitor combinations is shown in the table below: Guideline for conversion from conventional Levodopa/Carbidopa tablet to Levodopa-Carbidopa prolonged-release tablet: Conventional tablet: Daily Dosage of Levodopa 300-400 mg Controlled Release tablet: Daily Dosage of Levodopa 400 mg. Dosage Regimen: 1 tablet 2x daily. Conventional tablet: Daily Dosage of Levodopa 500-600 mg Controlled Release tablet: Daily Dosage of Levodopa 600 mg. Dosage Regimen: 1 tablet 3x daily. Conventional tablet: Daily Dosage of Levodopa 700-800 mg Controlled Release tablet: Daily Dosage of Levodopa 800 mg. Dosage Regimen: 4 tablets in 3 or 4 divided doses. Conventional tablet: Daily Dosage of Levodopa 900-1000 mg Controlled Release tablet: Daily Dosage of Levodopa 1000 mg. Dosage Regimen: 5 tablets in 3 or more divided doses. Conventional tablet: Daily Dosage of Levodopa 1100-1200 mg Controlled Release tablet: Daily Dosage of Levodopa 1200 mg. Dosage Regimen: 6 tablets in 3 or more divided doses. Conventional tablet: Daily Dosage of Levodopa 1300-1400 mg Controlled Release tablet: Daily Dosage of Levodopa 1400 mg. Dosage Regimen: 7 tablets in 3 or more divided doses. Conventional tablet: Daily Dosage of Levodopa 1500-1600 mg Controlled Release tablet: Daily Dosage of Levodopa 1600 mg. Dosage Regimen: 8 tablets in 3 or more divided doses.
Side Effects
Caution should be exercised when the following drugs are administered concomitantly with Levodopa-Carbidopa prolonged-release tablet. Antihypertensive agents: Symptomatic postural hypotension has occurred when levodopa/decarboxylase inhibitor combinations were added to the treatment of patients receiving some antihypertensive drugs. Therefore when therapy with Levodopa-Carbidopa prolonged-release tablet is started, dosage adjustment of the antihypertensive drug may be required. Antidepressants: There have been rare reports of adverse reactions, including hypertension and dyskinesia, resulting from the concomitant use of tricyclic antidepressants and carbidopa-levodopa preparations. Anticholinergics: Anticholinergics may affect the absorption and thus the patient’s response. Iron: Studies demonstrate a decrease in the bioavailability of carbidopa and/or levodopa when it is ingested with ferrous sulphate or ferrous gluconate. Other drugs: Dopamine D2 receptor antagonists (e.g. phenothiazines, butyrophenones and risperidone) and isoniazid may reduce the therapeutic effects of levodopa. The beneficial effects of levodopa in Parkinson’s disease have been reported to be reversed by phenytoin and papaverine. Patients taking these drugs with Levodopa-Carbidopa prolonged-release tablet should be observed carefully for loss of therapeutic response. Concomitant therapy with selegiline and carbidopa-levodopa may be associated with severe orthostatic hypotension not attributable to carbidopa-levodopa alone. Since levodopa competes with certain amino acids, the absorption of levodopa may be impaired in some patients on a high protein diet. The effect of simultaneous administration of antacids with Levodopa-Carbidopa prolonged-release tablet on the bioavailability of levodopa has not been studied.
Pregnancy And Lactation
Levodopa-Carbidopa prolonged-release tablet should not be given when administration of a sympathomimetic amine is contraindicated. Non-selective monoamine oxidase (MAO) inhibitors are contraindicated for use with Levodopa-Carbidopa prolonged release tablet. These inhibitors must be discontinued at least two weeks prior to initiating therapy with Levodopa-Carbidopa prolonged release tablet. Levodopa-Carbidopa prolonged release tablet may be administered concomitantly with the manufacturer's recommended dose of an MAO inhibitor with selectivity for MAO type B (e.g. selegiline hydrochloride). Levodopa-Carbidopa prolonged release tablet is contraindicated in patients with known hypersensitivity to any component of this medication, and in patients with narrow-angle glaucoma. Because levodopa may activate a malignant melanoma, Levodopa-Carbidopa prolonged release tablet should not be used in patients with suspicious undiagnosed skin lesions or a history of melanoma.
Therapeutic
There are insufficient data to evaluate the possible harmfulness of this substance when used in human pregnancy. It is not known whether carbidopa is excreted in human milk. In a study of one nursing mother with Parkinson's disease, excretion of levodopa in breast milk was reported. Levodopa-Carbidopa prolonged-release tablet should not be given during pregnancy and to nursing mothers.
Storage Conditions
When patients are receiving levodopa monotherapy, levodopa must be discontinued at least eight hours before therapy with Levodopa-Carbidopa prolonged-release tablet is started (at least 12 hours if slow-release levodopa has been administered). Dyskinesias may occur in patients previously treated with levodopa alone because carbidopa permits more levodopa to reach the brain and, thus, more dopamine to be formed. The occurrence of dyskinesias may require dosage reduction. Levodopa-Carbidopa prolonged-release tablet is not recommended for the treatment of drug-induced extrapyramidal reactions or for the treatment of Huntingdon’s chorea. Based on the pharmacokinetic profile of Levodopa-Carbidopa prolonged-release tablet the onset of effect in patients with early morning dyskinesias may be slower than with conventional Levodopa-Carbidopa tablet. The incidence of dyskinesias is slightly higher during treatment with Levodopa-Carbidopa prolonged-release tablet than with conventional Levodopa-Carbidopa tablet (16.5% vs 12.2%) in advanced patients with motor fluctuations. Levodopa-Carbidopa prolonged-release tablet should be administered cautiously to patients with severe cardiovascular or pulmonary disease, bronchial asthma, renal, hepatic or endocrine disease, or with a history of peptic ulcer disease or of convulsions. Care should be exercised in administering Levodopa-Carbidopa prolonged-release tablet to patients with a history of recent myocardial infarction who have residual atrial, nodal, or ventricular arrhythmia. In such patients, cardiac function should be monitored with particular care during the period of initial dosage administration and titration. Levodopa has been associated with somnolence and episodes of sudden sleep onset. Sudden onset of sleep during daily activities, in some cases without awareness or warning signs, has been reported very rarely. Patients must be informed of this and advised to exercise caution while driving or operating machines during treatment with levodopa. Patients who have experienced somnolence and/or an episode of sudden sleep onset must refrain from driving or operating machines. Furthermore a reduction of dosage or termination of therapy may be considered. As with levodopa, Levodopa-Carbidopa prolonged-release tablet may cause involuntary movements and mental disturbances. Patients with a history of severe involuntary movements or psychotic episodes when treated with levodopa alone or levodopa/decarboxylase inhibitor combination should be observed carefully when Levodopa-Carbidopa prolonged-release tablet is substituted. These reactions are thought to be due to increased brain dopamine following administration of levodopa and use of Levodopa-Carbidopa prolonged-release tablet may cause recurrence. Dosage reduction may be required. All patients should be observed carefully for the development of depression with concomitant suicidal tendencies. Patients with past or current psychoses should be treated with caution. Impulse control disorders: Patients should be regularly monitored for the development of impulse control disorders. Patients and carers should be made aware that behavioural symptoms of impulse control disorders including pathological gambling, increased libido, hypersexuality, compulsive spending or buying, binge eating and compulsive eating can occur in patients treated with dopamine agonists and/or other dopaminergic treatments containing levodopa including Levodopa-Carbidopa tablet. Review of treatment is recommended if such symptoms develop.
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