What are the advantages of levodopa inhalation powder spray (levodopa) compared to oral preparations?

Levodopa needs to be absorbed through the gastrointestinal tract after oral administration, and then enters the brain through blood circulation to exert its effects. The usual onset of effect is about 30 minutes to 1 hours. The drug is directly inhaled into the blood circulation through the lungs, bypassing the gastrointestinal absorption process. It usually takes effect in 5 - 10 minutes. It can quickly relieve the motor symptoms of Parkinson's disease patients, such as tremor, stiffness, etc., and has a significant effect on sudden symptoms caused by the "end-of-dose phenomenon" or "switch phenomenon".