Cesar,
It's a bit simplistic, but you can compare one set of Parkinson's drugs with another using the concept of levodopa equivalent daily dose (LEDD).
See thread:
http://neurotalk.psychcentral.com/thread169655.html
Note these are estimates based on the literature, which is not always in agreement.
Your daily dose, before:
Requip 16mg, scaling factor = 20, giving LEDD of 320mg
Stalevo 300mg, SF=1.33, LEDD = 400mg
Total LEDD = 720mg
After:
Requip 14mg
Trivastal (dose not reported) is piribedil SF=1
Amantadine (dose not reported) SF=1
John