I first read this 4-5 months ago -

"The risk of new onset heart failure associated with dopamine agonist use in Parkinson's disease."

http://www.ncbi.nlm.nih.gov/pubmed/22123498

The study says Pramipexole (Mirapex) increased the risk of heart failure in people with Parkinson's Disease by 61%. In the first three months of therapy, the risk of using pramipexole was far greater, as it trebled the risk of heart failure. The risk also increased with age, as the risk of heart failure in those people with Parkinson's Disease over 80 years old taking pramipexole was also trebled.

The study also says when other dopamine agonists were assessed the researchers found NO risk of an increase in heart failure in people with Parkinson's Disease. I have been taking a small dose of Mirapex for 6 months and I am considering to switch. Anyone can share the experiences of taking/switching to Requip?