It's not a terribly high dose, i wouldn't worry. Just be sure to drink plenty of water and eat plenty of fiber, that should take care of any issues you might have at those doses.
You should be perfectly fine at that dose. If you find yourself getting constipated just try changing your diet or get some laxatives or stool softeners. It's probably not healthy to be constipated constantly but it's not going to cause you serious damage unless it gets to the point where you can't pass the stool and you get fecal impaction from waiting too long.