Assertion: dopamine's effect | /r/CapableOf | become inconsistent
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text: Sifrol is indicated for treatment of the signs and symptoms of idiopathic Parkinson's disease, alone (without levodopa) or in combination with levodopa, i.e. over the course of the disease, though to late stages when the effect of levodopa wears off or becomes inconsistent and fluctuations of the therapeutic effect occur (end-of-dose or 'on-off' fluctuations).