I have been taking the same Carbidopa Levadopa from the same maker (Mayne Pharma) for 4 years. When i had it filled this time the pills were different they have a M over 721 on one side and nothing on the other. The previous pills had a R on one side and 539 over a bar on the other. I can not find an image on the net so they must be new. They are flat on both sides. They must have changed how they work and It was a change for the better.
The first dose lasted over 4 hours. They take effect faster also (45 min vs 60 mins). I have been taking the new for a 5 days now and they have worked great every day. I went 7 hours and had only mild systems. The previous pills would last at most 3 or less. The previous pills had a R on one side and 539 over a bar on the other.
Feeling great