Levodopa can be used alone, but adding carbidopa lowers the amount of levodopa that is required and may reduce some of the side effects that are associated with levodopa, such as nausea and vomiting. Although levodopa helps relieve symptoms of Parkinson's disease, it does not slow down the progression of the disease.
Yucca is a genus of perennial shrubs and trees in the family Asparagaceae, subfamily Agavoideae. Its 40-50 species are notable for their rosettes of evergreen, tough, sword-shaped leaves and large terminal panicles of white or whitish flowers.rom Baja California in the west, northwards into the southwestern United States, through the drier central states as far north as Alberta in Canada (Yucca glauca ssp. albertana). Yucca is also native to the lowlands and dry beach scrub of the Gulf and South Atlantic states from coastal Texas to easternmost Virginia.
Two types of yucca plants grow in the South Texas Plains, a thick-leaf (or fleshy) yucca and a thin-leaf yucca. The thick-leaf yucca of the region is Yucca treculeana (formerly referred to as Yucca torreyi), commonly known as Spanish dagger. The common thin-leaf yucca of the region is Yucca constricta, or Buckley yucca.