According to my bottle, Vetmedin and pimobendan are the same thing. Sugar has been on it for about 6 months, one and a half 5mg tablets, twice a day. It does seem to be helping, and I didn't notice any side effects. Her cardiologist did warn me that it can cause sudden heart failure, but I thought it was worth the risk, and if it happened, that would be a better way to go than a slow death. Just my choice for my dog.