If you are already taking Levodopa (medicine containing only Levodopa), you must stop taking it at least 12 hours before you start taking Carbidopa and Levodopa combination medicine. Buy Syndopa 275 medicine causes sleepiness and can make you to fall asleep amidst normal daytime routines like walking, talking, eating, or driving. You may fall asleep suddenly, even if you are feeling absolutely fine and alert. Let your doctor know about your daytime sleepiness or drowsiness.