When can I give castor oil to my 3 year old and what is the dosage?

Castor oil ugh! Why in the world would you want to give your child such awful stuff? I assume she is constipated. If so an adjustment of her diet may be all that is necessary. For example cut down on the milk and dairy products, add more fruits and vegetables to the diet. Figs, prunes and dates also work well as natural laxatives.