Levodopa results in a reduction in the endogenous formation of L-DOPA, and eventually becomes counterproductive. Levodopa preparations lead in the long term to the development of motor complications characterized by involuntary movements called dyskinesias and fluctuations in the response to medication. When this occurs, PD patients change rapidly from stages with good response to medication and few symptoms ("on" state) to phases with no response to medication and important motor symptoms ("off" state). For this reason, levodopa doses are kept as low as possible while maintaining functionality. Delaying the initiation of dopatherapy, using instead alternatives for some time, is also common practice. A former strategy to reduce motor complications was to withdraw patients from L-DOPA for some time. It is discouraged now since it can bring dangerous side effects such as neuroleptic malignant syndrome. Most people eventually need levodopa and later develop motor complications.