good morning doc i was taking metformin 500 twice a day along with janumet 50 500 once a day , from the time the dosage has been raised to metforming 850 twice a day and januvia 100 , im yawning the whole day ,please help, my blood preasure has also dropped to 110 ,why ami yawningthe whoelday ,to be more specific every 2 minutes regards kenneth