Yeah my Mum has Parkinsons. It mostly shows as a tremble in her right hand (which gets worse with stress). Also some stiffness in walking (which is made worse by arthritis).
Mum was referred to a consultant neurolagist for a formal diagnosis.
She was prescribed "Sinemet" which as I understand is a combination drug which increases the levels of dopamine in the brain, which in people with Parkinsons is deficient.
But every patient will be different so the treatment will be based on the symptoms, how bad they are, the age of the person, any other medication they are taking etc etc.
As Parkinsons is a progressive disease the treatments are not effective forever, but the specialist told us that there's a reasonable chance of keeping them under fairly good control for maybe 15-20 years (and Mum is 77).
So Parkinsons is not so bad if you get it in old age, rather than when you're young.