I thought castor oil was toxic. I wad just reading online and came across this. So i copied and pasted. 
Worms Two of the more common species found in tortoises are the slender Roundworm and the red Nematode worm. Both are rarely detected until found wriggling around on or near the bottom of your tortoise tank. At this stage you have an infestation. Adult tortoises are given 1g santonin with 1g calomel and, the following day, a full eye-dropper of castor oil. Smaller tortoises are given a smaller amount.
As trade names often disappear from the market and new ones are introduced it is often best to check with your local veterinarian regarding brands and amounts of medicines administered.
Worms Two of the more common species found in tortoises are the slender Roundworm and the red Nematode worm. Both are rarely detected until found wriggling around on or near the bottom of your tortoise tank. At this stage you have an infestation. Adult tortoises are given 1g santonin with 1g calomel and, the following day, a full eye-dropper of castor oil. Smaller tortoises are given a smaller amount.
As trade names often disappear from the market and new ones are introduced it is often best to check with your local veterinarian regarding brands and amounts of medicines administered.
