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In controlled clinical trials, patients predominantly with moderate to severe motor fluctuations while on SINEMET were randomized to therapy with either SINEMET or SINEMET CR. The adverse experience frequency profile of SINEMET CR did not differ substantially from that of SINEMET, as shown in Table 1.
Table 1: Clinical Adverse Experiences Occurring in 1%
or Greater of Patients
|Adverse Experience||SINEMET CR
|Urinary tract infection||2.2||2.3|
|Upper respiratory infection||1.8||1.0|
Abnormal laboratory findings occurring at a frequency of 1% or greater in approximately 443 patients who received SINEMET CR and 475 who received SINEMET during controlled clinical trials included: decreased hemoglobin and hematocrit; elevated serum glucose; white blood cells, bacteria and blood in the urine.
The adverse experiences observed in patients in uncontrolled studies were similar to those seen in controlled clinical studies.
Other adverse experiences reported overall in clinical trials in 748 patients treated with SINEMET CR, listed by body system in order of decreasing frequency, include:
Body as a Whole
Asthenia, fatigue, abdominal pain, orthostatic effects.
The following adverse experiences have been reported in postmarketing experience with SINEMET CR:
Cardiac irregularities, syncope.
Taste alterations, dark saliva.
Alopecia, flushing, dark sweat.
Other adverse reactions that have been reported with levodopa alone and with various carbidopa levodopa formulations and may occur with SINEMET CR are:
Weight gain, edema.
Ataxia, depression with suicidal tendencies, dementia, euphoria, convulsions (however, a causal relationship has not been established); bradykinetic episodes, numbness, muscle twitching, blepharospasm (which may be taken as an early sign of excess dosage; consideration of dosage reduction may be made at this time), trismus, activation of latent Horner's syndrome, nightmares.
Urinary retention, priapism.
Read the Sinemet CR (carbidopa-levodopa sustained release) Side Effects Center for a complete guide to possible side effects
Caution should be exercised when the following drugs are administered concomitantly with SINEMET CR.
Symptomatic postural hypotension has occurred when carbidopa levodopa preparations were added to the treatment of patients receiving some antihypertensive drugs. Therefore, when therapy with SINEMET CR is started, dosage adjustment of the antihypertensive drug may be required.
For patients receiving MAO inhibitors (Type A or B), see CONTRAINDICATIONS. Concomitant therapy with selegiline and carbidopa levodopa may be associated with severe orthostatic hypotension not attributable to carbidopa levodopa alone (see CONTRAINDICATIONS).
Dopamine D2 receptor antagonists (e.g., phenothiazines, butyrophenones, risperidone) and isoniazid may reduce the therapeutic effects of levodopa. In addition, the beneficial effects of levodopa in Parkinson's disease have been reported to be reversed by phenytoin and papaverine. Patients taking these drugs with SINEMET CR should be carefully observed for loss of therapeutic response.
Use of SINEMET CR with dopamine-depleting agents (e.g., reserpine and tetrabenazine) or other drugs known to deplete monoamine stores is not recommended.
SINEMET CR and iron salts or multivitamins containing iron salts should be coadministered with caution. Iron salts can form chelates with levodopa and carbidopa and consequently reduce the bioavailability of carbidopa and levodopa.
Although metoclopramide may increase the bioavailability of levodopa by increasing gastric emptying, metoclopramide may also adversely affect disease control by its dopamine receptor antagonistic properties.
Read the Sinemet CR Drug Interactions Center for a complete guide to possible interactions
Last reviewed on RxList: 12/15/2016
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